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Prof. Kuk Ro Yoon
Department of Chemistry, Hannam University, Daejeon 305-811, Korea

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0 Sensors
0 Supercapacitors
0 bioadhesives
0 bionanomaterials

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Journal article
Published: 07 April 2021 in International Journal of Biological Macromolecules
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A green and scalable approach for the preparation of few-layered graphene utilizing the biowaste of potato peels has been developed. The potato peels have been dried and carbonized to obtain a new graphite structure that has been exfoliated in N-methylene phosphonic acid chitosan (MPC). The exfoliation process assisted the formation of graphene sheets with a high size diameter and quality of 50% based on the weight of graphite structure. The graphene sheets were green decorated with silver nanoparticles using microwave power to obtain new nanocomposites. The mass ratio between the graphite and silver nitrate was optimized and observed to change the morphology and size diameter of silver nanoparticles. The as-prepared MPC structure, graphene, and silver decorated graphene nanocomposites were characterized using 1HNMR, FTIR, XRD, UV/Vis spectrophotometer, SEM, and TEM besides tested as antimicrobial agents. The bacterial performance was also controlled by changing the number of AgNPs distributed on graphene sheets based on the mass ratios of graphite/AgNO3. The inhibition diameter of silver decorated graphene was considerably increased to 24.8, and 20.1 mm as in the case of MPC-GRP-Ag30 composite compared to the pure graphene (11.2, 13.5 mm) for E. coli and S. aureus, consecutively proposing that the blade edge of graphene sheets can destroy the bacteria membrane and release silver cations promptly that are directed for the interaction with the cytoplasmic parts of the bacteria cell. Such findings offer green and biocompatible antibacterial agents based on the graphene derived from the biowaste products.

ACS Style

Emad S. Goda; Mahmoud H. Abu Elella; Muhammad Sohail; Bal Sydulu Singu; Bidhan Pandit; A.M. El Shafey; Abdelaziz M. Aboraia; Heba Gamal; Sang Eun Hong; Kuk Ro Yoon. N-methylene phosphonic acid chitosan/graphene sheets decorated with silver nanoparticles as green antimicrobial agents. International Journal of Biological Macromolecules 2021, 182, 680 -688.

AMA Style

Emad S. Goda, Mahmoud H. Abu Elella, Muhammad Sohail, Bal Sydulu Singu, Bidhan Pandit, A.M. El Shafey, Abdelaziz M. Aboraia, Heba Gamal, Sang Eun Hong, Kuk Ro Yoon. N-methylene phosphonic acid chitosan/graphene sheets decorated with silver nanoparticles as green antimicrobial agents. International Journal of Biological Macromolecules. 2021; 182 ():680-688.

Chicago/Turabian Style

Emad S. Goda; Mahmoud H. Abu Elella; Muhammad Sohail; Bal Sydulu Singu; Bidhan Pandit; A.M. El Shafey; Abdelaziz M. Aboraia; Heba Gamal; Sang Eun Hong; Kuk Ro Yoon. 2021. "N-methylene phosphonic acid chitosan/graphene sheets decorated with silver nanoparticles as green antimicrobial agents." International Journal of Biological Macromolecules 182, no. : 680-688.

Journal article
Published: 05 February 2021 in Journal of Industrial and Engineering Chemistry
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In the present work, multiwall carbon nanotubes (CNTs) were used as a reducing agent for the preparation of CNT-MnO2 nanocomposites by varying the amount of potassium permanganate (KMnO4). The chemical compositions of the as-synthesized materials were analyzed using X-ray diffraction, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, which showed the formation of MnO2 in the CNT-MnO2 nanocomposites. The electrochemical properties of the CNT-MnO2 nanocomposites were thoroughly investigated through cyclic voltammetry, charge–discharge, and impedance studies. The CNT-MnO2-25 nanocomposites appeared with the highest specific capacitance of 674 F g−1 at a current density of 2 A g−1; they also displayed an excellent capacitance retention of ∼110% even after the completion of 5000 continuous charge–discharge cycles at 10 A g−1.

ACS Style

Bal Sydulu Singu; Emad S. Goda; Kuk Ro Yoon. Carbon Nanotube–Manganese oxide nanorods hybrid composites for high-performance supercapacitor materials. Journal of Industrial and Engineering Chemistry 2021, 97, 239 -249.

AMA Style

Bal Sydulu Singu, Emad S. Goda, Kuk Ro Yoon. Carbon Nanotube–Manganese oxide nanorods hybrid composites for high-performance supercapacitor materials. Journal of Industrial and Engineering Chemistry. 2021; 97 ():239-249.

Chicago/Turabian Style

Bal Sydulu Singu; Emad S. Goda; Kuk Ro Yoon. 2021. "Carbon Nanotube–Manganese oxide nanorods hybrid composites for high-performance supercapacitor materials." Journal of Industrial and Engineering Chemistry 97, no. : 239-249.

Short communication
Published: 06 January 2021 in Composites Communications
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Vapor-phase polymerization (VPP) of pyrrole is a facile, and salutary technique for enhancing multilateral properties of substrates for various applications. Herein, a facile, and eco-friendly VPP of pyrrole on the cotton/polyester substrate using the silver nitrate has been primarily introduced. The polymerization time and the oxidant concentration have been varied to obtain new composite textiles. The redox reaction that happened between silver ions and pyrrole monomer results in forming polypyrrole-silver composite (Ppy-Ag) as a coating layer for obtaining smart textiles with versatile properties. The structure and morphology of the as-formed composite were assured on the surface of the textile using FTIR, XRD, EDX, TGA, and SEM. The conductivity, antibacterial, and flammability of the as-developed textiles were estimated. The coated textile achieved superior conductivity features as the electrical resistance was recorded as 0.0218 kΩ which is much lower compared to the pure textile (2770 kΩ). Additionally, the composites accomplished an inhibition zone with the diameters of 25, and 28 mm for E.coli, and S. aureus, respectively confirming a supreme antibacterial behavior. Also, they fulfilled an unexpected rate of burning 80.6 mm/min with concerning to the virgin textile (149.3 mm/min) achieving flame retardancy by 46 %.

ACS Style

Mahmoud H. Abu Elella; Emad S. Goda; Kuk Ro Yoon; Sang Eun Hong; Mahmoud S. Morsy; Rasha A. Sadak; Heba Gamal. Novel vapor polymerization for integrating flame retardant textile with multifunctional properties. Composites Communications 2021, 24, 100614 .

AMA Style

Mahmoud H. Abu Elella, Emad S. Goda, Kuk Ro Yoon, Sang Eun Hong, Mahmoud S. Morsy, Rasha A. Sadak, Heba Gamal. Novel vapor polymerization for integrating flame retardant textile with multifunctional properties. Composites Communications. 2021; 24 ():100614.

Chicago/Turabian Style

Mahmoud H. Abu Elella; Emad S. Goda; Kuk Ro Yoon; Sang Eun Hong; Mahmoud S. Morsy; Rasha A. Sadak; Heba Gamal. 2021. "Novel vapor polymerization for integrating flame retardant textile with multifunctional properties." Composites Communications 24, no. : 100614.

Journal article
Published: 14 November 2020 in International Journal of Biological Macromolecules
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Herein, we reported the preparation of novel antibacterial nanocomposites based on biodegradable polymers. The nanocomposites were applied as capable adsorbent for removing of malachite green (MG) dye, as well as inhibiting of E. coli and S. aureus growth as the most common pollutants for water. The grafted xanthan gum with poly(vinylimidazole) (XG-g-PVI) nanocomposites were synthesized in the presence of different Montmorillonite (MMT) nanoclays concentrations (1%, 3% and 5%). The prepared modified XG nanocomposites were detected through XRD, SEM-EDX, FTIR and TEM. The maximum adsorption MG capacity was determined as 99.99% (909.1 mg/g) in basic medium at 30 °C for 90 min. The adsorption isotherm for removal of MG dye was studied against different models like Langmuir, Freundlich, Temkin, FloryHuggins isotherm models, however, the adsorption results were good fitted with Langmuir isotherm model (R2 = 0.9942). Additionally, various adsorption kinetic models: pseudo-first order, second order, pseudo-second order, and intra-particle diffusion models were studied for adsorption mechanism of MG dye on top of prepared nanocomposite surface. Finally, the antibacterial activity outcomes displayed that the prepared XG-g-PVI/MMT nanocomposites had excellent inhibition growth for bacteria and the antibacterial activity increased abruptly with the increased of MMT nanoclay concentrations.

ACS Style

Mahmoud H. Abu Elella; Emad S. Goda; Heba M. Abdallah; Ahmed Esmail Shalan; Heba Gamal; Kuk Ro Yoon. Innovative bactericidal adsorbents containing modified xanthan gum/montmorillonite nanocomposites for wastewater treatment. International Journal of Biological Macromolecules 2020, 167, 1113 -1125.

AMA Style

Mahmoud H. Abu Elella, Emad S. Goda, Heba M. Abdallah, Ahmed Esmail Shalan, Heba Gamal, Kuk Ro Yoon. Innovative bactericidal adsorbents containing modified xanthan gum/montmorillonite nanocomposites for wastewater treatment. International Journal of Biological Macromolecules. 2020; 167 ():1113-1125.

Chicago/Turabian Style

Mahmoud H. Abu Elella; Emad S. Goda; Heba M. Abdallah; Ahmed Esmail Shalan; Heba Gamal; Kuk Ro Yoon. 2020. "Innovative bactericidal adsorbents containing modified xanthan gum/montmorillonite nanocomposites for wastewater treatment." International Journal of Biological Macromolecules 167, no. : 1113-1125.

Journal article
Published: 10 November 2020 in Journal of Alloys and Compounds
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Prussian blue and its analogues as one of the metal-organic frameworks are commonly used for fabricating energy storage electrodes due to their outstanding properties such as the high surface area, 3D porous networks, and the low cost. However, they are suffering from ther low energy density and conductivity that can limit their further applications. Herein we utilize a facile and new bottom-up protocol for the deposition of copper hexacyanoferrate nanocubes (Cu-PBA) on the surface of graphene oxide (GO) as a binder-free electrode for supercapacitors. This paper draws a complete picture for the merits of handy successive ionic layer adsorption and reaction (SILAR) technique for coating [email protected] nanocomposite on the inexpensive stainless steel substrate. The effect of the reaction cycles on the morphology, crystallinity, and electrochemical behavior of [email protected] nanocomposite, besides the effective synergism between the Cu-PBA and graphene oxide were studied. FTIR, XPS, SEM, TEM and XRD assured the formation of cubic Cu-PBA in the hybrid Cu-PBA/GO thin films. Interestingly, the hybrid SS/[email protected] could deliver an eminent specific capacitance of 611.6 F/g which is 2.7 times of that for the pure Cu-PBA (225.93 F/g) at an applied current density of 0.5 A/g with better cycling stability as it could retain approximately 86% of its initial capacitance after performing 2000 cycles at a current density of 4 A/g. Additionally, the hybrid electrode could achieve a supreme energy density value of 54.37 Wh/kg at a specific power of 200 W/kg. Such an outstanding electrochemical behavior of [email protected] hybrid could open the way for the development of smart and flexible supercapacitors by using a green and cost-effective method instead of the organic-based ones.

ACS Style

Emad S. Goda; Sang Eun Hong; Kuk Ro Yoon. Facile synthesis of Cu-PBA nanocubes/graphene oxide composite as binder-free electrodes for supercapacitor. Journal of Alloys and Compounds 2020, 859, 157868 .

AMA Style

Emad S. Goda, Sang Eun Hong, Kuk Ro Yoon. Facile synthesis of Cu-PBA nanocubes/graphene oxide composite as binder-free electrodes for supercapacitor. Journal of Alloys and Compounds. 2020; 859 ():157868.

Chicago/Turabian Style

Emad S. Goda; Sang Eun Hong; Kuk Ro Yoon. 2020. "Facile synthesis of Cu-PBA nanocubes/graphene oxide composite as binder-free electrodes for supercapacitor." Journal of Alloys and Compounds 859, no. : 157868.

Review
Published: 05 November 2020 in Journal of Environmental Chemical Engineering
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Xanthan gum (XG), a naturally occurring microbial exopolysaccharide, is of a great commercial significance. It has demonstrated a significant potential in targeted applications such as advanced drug delivery, wastewater treatment, protein delivery, tissue engineering, and food packaging due to its outstanding physicochemical properties, biodegradability, and non-toxicity. However, certain limitations such as low surface area, poor mechanical performance, thermal stability, and bacterial growth can hinder its uses in specific applications. As a result, there have been various endeavors to modify xanthan gum by means of diverse modification approaches for enhancing its physicochemical properties, and therefore enabling its competence for the needs of drug delivery, tissue engineering, oil recovery, and environmental applications. To the best of our knowledge, this is the first review for providing a comprehensive picture of the advanced chemical treatment, grafting procedures, hydrogel synthesis, bio-nanocomposites containing metal, and metal oxide nanoparticles, graphene, and inorganic clays, along with the fabulous properties obtained for the xanthan derived materials. Furthermore, it exhibits the recent applications for these materials in industrial, biomedical engineering, wastewater treatment, and agricultural fields. In the future, the presented data will be considered a fabulous base for designing the next generation materials to be applied in further advanced uses.

ACS Style

Mahmoud H. Abu Elella; Emad S. Goda; Mohamed A. Gab-Allah; Sang Eun Hong; Bidhan Pandit; Seungho Lee; Heba Gamal; Aafaq Ur Rehman; Kuk Ro Yoon. Xanthan gum-derived materials for applications in environment and eco-friendly materials: A review. Journal of Environmental Chemical Engineering 2020, 9, 104702 .

AMA Style

Mahmoud H. Abu Elella, Emad S. Goda, Mohamed A. Gab-Allah, Sang Eun Hong, Bidhan Pandit, Seungho Lee, Heba Gamal, Aafaq Ur Rehman, Kuk Ro Yoon. Xanthan gum-derived materials for applications in environment and eco-friendly materials: A review. Journal of Environmental Chemical Engineering. 2020; 9 (1):104702.

Chicago/Turabian Style

Mahmoud H. Abu Elella; Emad S. Goda; Mohamed A. Gab-Allah; Sang Eun Hong; Bidhan Pandit; Seungho Lee; Heba Gamal; Aafaq Ur Rehman; Kuk Ro Yoon. 2020. "Xanthan gum-derived materials for applications in environment and eco-friendly materials: A review." Journal of Environmental Chemical Engineering 9, no. 1: 104702.

Journal article
Published: 22 June 2020 in Materials Chemistry and Physics
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Here, we presented a straight forward and new approach for designing the interfacial compatibility between polyvinyl alcohol (PVA) and graphene sheets. The synthesis of poly(delta-gluconolactone) grafted from reduced graphene oxide (PGL-g-rGO) has been primarily developed by the ring-opening polymerization (ROP) of the green delta-gluconolactone monomer. The structure of PGL-g-rGO was fully confirmed using 1HNMR, XRD, FTIR, UV/Vis spectroscopy, TGA, and SEM. Poly(delta-gluconolactone) was expected to have a dual function of an efficacious modifier and a reducing agent for graphene oxide. Hence, the addition of PGL-g-rGO as a filler into PVA polymer was done into different mass ratios to obtain high-performance polymer nanocomposites. The dispersion and interfacial interaction of PGL-g-rGO sheets with the PVA matrix were studied. The thermal behavior, mechanical properties, and surface wettability of the final PVA nanocomposites were also evaluated. It can be observed that the char yield and the initial decomposition temperature of PVA were considerably enhanced after the addition of PGL-g-rGO to the polymer besides, the mechanical properties were totally improved. The use of PGL-g-rGO with only a mass ratio of 1.5% results in increasing the tensile strength and Young's modulus of PVA polymer by 124 and 121%, respectively. The elongation at break was uncommonly increased from 93 to 251% because of the formed strong hydrogen bonding between the filler and the polymer which can't only work on the efficacious convey of stress from PVA to reduced graphene sheets but also facilitate the polymer crystallization.

ACS Style

Emad S. Goda; Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. Good dispersion of poly(δ-gluconolactone)-grafted graphene in poly(vinyl alcohol) for significantly enhanced mechanical strength. Materials Chemistry and Physics 2020, 254, 123465 .

AMA Style

Emad S. Goda, Bal Sydulu Singu, Sang Eun Hong, Kuk Ro Yoon. Good dispersion of poly(δ-gluconolactone)-grafted graphene in poly(vinyl alcohol) for significantly enhanced mechanical strength. Materials Chemistry and Physics. 2020; 254 ():123465.

Chicago/Turabian Style

Emad S. Goda; Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. 2020. "Good dispersion of poly(δ-gluconolactone)-grafted graphene in poly(vinyl alcohol) for significantly enhanced mechanical strength." Materials Chemistry and Physics 254, no. : 123465.

Review article
Published: 06 April 2020 in Journal of Energy Chemistry
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Remarkable attention has been directed to Prussian blue (PB) and its analogues (PBA) as one of the most widely used metal-organic frameworks (MOFs) especially in the field of energy storage devices due to their fabulous features such as 3D open framework, high surface area, controllable distribution of pores and the low cost. Nevertheless, their depressed conductivity causes some insulation when being used as an electrode for supercapacitors leading to be restricted in further applications particularly the electronics. To the best of our knowledge, our review aimed primarily to give a total picture of the research that was done on utilizing PB and PBA for fabricating the electrodes of supercapacitor, studying their synthesis approaches in addition to the hybridization with other materials such as graphene, CNTs and conducting polymer. It also addresses the transformation of PB or PBA into other interesting nanostructures such as oxides, sulfides, and bicomponent of graphitic carbon nitride/metal oxides, as well. Furthermore, It exhibits various avenues for overcoming their disadvantages of bad cycle life, retention rate and not achieving the desired values of energy/power densities opening the door for enlarging the number of researches on their application as supercapacitors.

ACS Style

Emad S. Goda; Seungho Lee; Muhammad Sohail; Kuk Ro Yoon. Prussian blue and its analogues as advanced supercapacitor electrodes. Journal of Energy Chemistry 2020, 50, 206 -229.

AMA Style

Emad S. Goda, Seungho Lee, Muhammad Sohail, Kuk Ro Yoon. Prussian blue and its analogues as advanced supercapacitor electrodes. Journal of Energy Chemistry. 2020; 50 ():206-229.

Chicago/Turabian Style

Emad S. Goda; Seungho Lee; Muhammad Sohail; Kuk Ro Yoon. 2020. "Prussian blue and its analogues as advanced supercapacitor electrodes." Journal of Energy Chemistry 50, no. : 206-229.

Full paper
Published: 04 September 2019 in ChemNanoMat
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Copper cobaltite (CuCo2O4) porous structures with different morphologies are prepared through a hydrothermal method and subsequent annealing process. The tunability of morphologies is succeeded by simply regulation of solvent medium and amount of the polyvinylpyrrolidone (PVP) which is served as structure directing agent. All the prepared samples have a mesoporous nature. Specifically, the CuCo2O4–porous structures with flowers morphology have a higher surface area (43.2 m2/g) and porosity (0.18 cm3/g) than the other porous nano structures such as flakes, blades and wires. The maximum specific capacity of CuCo2O4–Flowers is 466.4 C g–1 at a current density of 2 A g–1. The cycling stability of CuCo2O4–Flowers shows capacity retention of 86.3% at a high current density of 15 A g–1 after completion of 5000 charge‐discharge cycles. The electrochemical results demonstrate that the CuCo2O4–Flower shows superior performance than the CuCo2O4–Flakes, Blade and Wires.

ACS Style

Bal Sydulu Singu; Rambabu Kuchi; Phuoc Cao Van; Dongsoo Kim; Kuk Ro Yoon; Jong Ryul Jeong. Tunability of Porous CuCo 2 O 4 Architectures as High‐Performance Electrode Materials for Supercapacitors. ChemNanoMat 2019, 5, 1398 -1407.

AMA Style

Bal Sydulu Singu, Rambabu Kuchi, Phuoc Cao Van, Dongsoo Kim, Kuk Ro Yoon, Jong Ryul Jeong. Tunability of Porous CuCo 2 O 4 Architectures as High‐Performance Electrode Materials for Supercapacitors. ChemNanoMat. 2019; 5 (11):1398-1407.

Chicago/Turabian Style

Bal Sydulu Singu; Rambabu Kuchi; Phuoc Cao Van; Dongsoo Kim; Kuk Ro Yoon; Jong Ryul Jeong. 2019. "Tunability of Porous CuCo 2 O 4 Architectures as High‐Performance Electrode Materials for Supercapacitors." ChemNanoMat 5, no. 11: 1398-1407.

Original research
Published: 31 August 2019 in Cellulose
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A facile and green method was utilized for preparing an efficient dual function adsorbent as a filter for capturing crystal violet (CV) dye and an inhibitor for the growth of Escherichia coli based on interpenetrating networks (IPNs) between N,N,N-trimethyl chitosan (TMC) and xanthan gum (XG) in different weight ratios. The IPNs showed an excellent CV dye adsorption capacity (94.4%, Qmax = 555.6 mg g−1) at the optimum conditions chosen in this study, where 40 mg of the adsorbent was used for 50 mL of the 450 mg L−1 CV solution at pH 7, temperature of 30 °C and the equilibrium adsorption time of 6 h. The adsorption data were well fitted to the Langmuir isotherm model. The adsorption kinetics exhibited pseudo-first order and intraparticle diffusion model participating in the mechanism of CV adsorption on IPN surface. The antibacterial activity test exhibited that all TMC/XG IPNs inhibited growth of E. coli, suggesting potential application as an antibacterial adsorbent in wastewater treatment.

ACS Style

Mahmoud H. Abu Elella; Eman Abd Elhafeez; Emad S. Goda; Seungho Lee; Kuk Ro Yoon. Smart bactericidal filter containing biodegradable polymers for crystal violet dye adsorption. Cellulose 2019, 26, 9179 -9206.

AMA Style

Mahmoud H. Abu Elella, Eman Abd Elhafeez, Emad S. Goda, Seungho Lee, Kuk Ro Yoon. Smart bactericidal filter containing biodegradable polymers for crystal violet dye adsorption. Cellulose. 2019; 26 (17):9179-9206.

Chicago/Turabian Style

Mahmoud H. Abu Elella; Eman Abd Elhafeez; Emad S. Goda; Seungho Lee; Kuk Ro Yoon. 2019. "Smart bactericidal filter containing biodegradable polymers for crystal violet dye adsorption." Cellulose 26, no. 17: 9179-9206.

Journal article
Published: 27 August 2019 in Journal of Energy Storage
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We have utilized the SILAR technique to prepare the manganese oxide nanosheets on SS substrates for binder free supercapacitor electrode. The manganese oxide nanosheets thin films were prepared and well structural characterized with Raman, XRD, XPS, FE-SEM, FE-TEM and EDAX mapping. The electrochemical properties of manganese oxide thin films were systematically studied with cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The manganese oxide nanosheets show the utmost capacitance of 398 F g–1, at the current density of 1 A g–1. The capacity retention was 91.3% after completion of 2000 cycles at 20 A g–1. The manganese oxide nanosheets display the maximum energy density of 35.4 Wh kg–1 and power density of 8000 W kg–1. These impressive results conclude the manganese oxide nanosheets was a promising electrode material for supercapacitor.

ACS Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. Preparation and characterization of manganese oxide nanosheets for pseudocapacitor application. Journal of Energy Storage 2019, 25, 100851 .

AMA Style

Bal Sydulu Singu, Sang Eun Hong, Kuk Ro Yoon. Preparation and characterization of manganese oxide nanosheets for pseudocapacitor application. Journal of Energy Storage. 2019; 25 ():100851.

Chicago/Turabian Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. 2019. "Preparation and characterization of manganese oxide nanosheets for pseudocapacitor application." Journal of Energy Storage 25, no. : 100851.

Review
Published: 12 April 2019 in Microchemical Journal
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Among the clays, halloysite nanotubes (HNTs) are fabulous hollow tubular type of aluminosilicates due to their interesting properties such as their natural occurrence, high surface area and cytocompatibility. Different ways of functionalization for the inner and surface of HNTs have been used to control their properties for specific applications. Moreover, the modified HNTs are considered a precious carrier for nanomaterials for improving their dispersion and can be designated for electrochemical sensing application due to their high surface area. The free lumen that was in HNTs can be utilized for hosting other compounds for obtaining nanostructures with excellent synergistic properties. The main purpose of this review is for the first time conducting a survey on the reports for engineering the HNTs surface to be used as an electrochemical sensor for identifying various analytes such as hydrogen peroxide, glucose, nitrite, ascorbic acid, surface plasmon resonance, catechol amines, hydrazine, dopamine and uric acid. Moreover, the latest procedures for the modification of HNTs with specified applications have been also described.

ACS Style

Emad S. Goda; Mohamed Gab-Allah; Bal Sydulu Singu; Kuk Ro Yoon. Halloysite nanotubes based electrochemical sensors: A review. Microchemical Journal 2019, 147, 1083 -1096.

AMA Style

Emad S. Goda, Mohamed Gab-Allah, Bal Sydulu Singu, Kuk Ro Yoon. Halloysite nanotubes based electrochemical sensors: A review. Microchemical Journal. 2019; 147 ():1083-1096.

Chicago/Turabian Style

Emad S. Goda; Mohamed Gab-Allah; Bal Sydulu Singu; Kuk Ro Yoon. 2019. "Halloysite nanotubes based electrochemical sensors: A review." Microchemical Journal 147, no. : 1083-1096.

Journal article
Published: 18 August 2018 in Journal of Alloys and Compounds
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In this paper, one-pot approach was used to produce the highly exfoliated reduced graphene oxide-manganese oxide nanocomposites (rGO-MnOx and rGO-Mn3O4) and systematically analyzed by spectral, thermal, elemental and electron microscope. From the FE-SEM analysis confirms the exfoliated reduced graphene oxide-manganese oxide nanocomposites formation. In the nanocomposites, manganese oxide nanoparticles present in the spherical (rGO-Mn3O4), spherical and cube shape (rGO-MnOx). The electrochemical properties of the rGO-MnOx and rGO-Mn3O4 nanocomposites were analyzed by cyclic voltammetry and charge-discharge study. The highly exfoliated rGO-MnOx nanocomposite show the higher electrochemical capacitive responsive than rGO-Mn3O4 nanocomposite. The rGO-MnOx nanocomposite exhibiting the utmost capacitance of 398.8 F g−1 at a sweep rate of 5 mV s−1, the energy density of 23.3 Wh kg−1 and power density of 2001 W kg−1, owing to the synergistic effect of reduced graphene oxide and spherical and cubical shape of manganese oxide nanoparticles.

ACS Style

Bal Sydulu Singu; Kuk Ro Yoon. Exfoliated graphene-manganese oxide nanocomposite electrode materials for supercapacitor. Journal of Alloys and Compounds 2018, 770, 1189 -1199.

AMA Style

Bal Sydulu Singu, Kuk Ro Yoon. Exfoliated graphene-manganese oxide nanocomposite electrode materials for supercapacitor. Journal of Alloys and Compounds. 2018; 770 ():1189-1199.

Chicago/Turabian Style

Bal Sydulu Singu; Kuk Ro Yoon. 2018. "Exfoliated graphene-manganese oxide nanocomposite electrode materials for supercapacitor." Journal of Alloys and Compounds 770, no. : 1189-1199.

Journal article
Published: 01 June 2018 in Journal of Industrial and Engineering Chemistry
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We have synthesized sulfur-doped nickel oxide (S-NiO) spherical nanosheets by emulsion method. The structure of the S-NiO nanosheets is characterized by using TGA, XRD, XPS, BET, FE-SEM and FE-TEM. From the TGA, XPS and EDAX results conclude the nickel oxide is doped with sulfur. The specific capacitance of the S-NiO nanosheets was showing 313 F g−1 at the scan rate of 5 mV s−1 by cyclic voltammetry. The S-NiO nanosheets showing the high rate performance of 80% at the current density ranging from 1–8 A g−1 and high retention of the capacitance 99% after completion of 1000 charge-discharge cycles.

ACS Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. Sulfur-doped nickel oxide spherical nanosheets for redox supercapacitors. Journal of Industrial and Engineering Chemistry 2018, 62, 321 -328.

AMA Style

Bal Sydulu Singu, Sang Eun Hong, Kuk Ro Yoon. Sulfur-doped nickel oxide spherical nanosheets for redox supercapacitors. Journal of Industrial and Engineering Chemistry. 2018; 62 ():321-328.

Chicago/Turabian Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. 2018. "Sulfur-doped nickel oxide spherical nanosheets for redox supercapacitors." Journal of Industrial and Engineering Chemistry 62, no. : 321-328.

Journal article
Published: 01 April 2018 in Journal of Alloys and Compounds
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ACS Style

Bal Sydulu Singu; Kuk Ro Yoon. Mesoporous polypyrrole-Ag nanocomposites for supercapacitors. Journal of Alloys and Compounds 2018, 742, 610 -618.

AMA Style

Bal Sydulu Singu, Kuk Ro Yoon. Mesoporous polypyrrole-Ag nanocomposites for supercapacitors. Journal of Alloys and Compounds. 2018; 742 ():610-618.

Chicago/Turabian Style

Bal Sydulu Singu; Kuk Ro Yoon. 2018. "Mesoporous polypyrrole-Ag nanocomposites for supercapacitors." Journal of Alloys and Compounds 742, no. : 610-618.

Journal article
Published: 01 April 2018 in Electrochimica Acta
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In this work, we report the one-pot synthesis of highly exfoliated graphene oxide-polypyrrole-Ag (GO-PPy-Ag) ternary nanocomposite using graphene oxide, silver nitrate and pyrrole. Formation of highly exfoliated GO-PPy-Ag ternary nanocomposite was systematically investigated by using FT-IR, Raman, XRD, XPS, TGA, BET, FE-SEM and TEM. Based on the surface morphology, it is concluded that the PPy-Ag nanoparticles are uniformly distributed over the highly exfoliated graphene oxide nanosheets. From the electrochemical study, GO-PPy-Ag ternary nanocomposite exhibits a highest specific capacitance of 370.6 F g−1 than the corresponding PPy-Ag binary nanocomposite (103.4 F g−1). The GO-PPy-Ag ternary nanocomposite showing the high rate performance of 87.4% at a current density ranging from 1 to 10 A g−1. The improved electrochemical properties are attributed to the good contact between PPy-Ag nanoparticles and graphene oxide nanosheets.

ACS Style

Bal Sydulu Singu; Kuk Ro Yoon. Highly exfoliated GO-PPy-Ag ternary nanocomposite for electrochemical supercapacitor. Electrochimica Acta 2018, 268, 304 -315.

AMA Style

Bal Sydulu Singu, Kuk Ro Yoon. Highly exfoliated GO-PPy-Ag ternary nanocomposite for electrochemical supercapacitor. Electrochimica Acta. 2018; 268 ():304-315.

Chicago/Turabian Style

Bal Sydulu Singu; Kuk Ro Yoon. 2018. "Highly exfoliated GO-PPy-Ag ternary nanocomposite for electrochemical supercapacitor." Electrochimica Acta 268, no. : 304-315.

Original paper
Published: 27 July 2017 in Ionics
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Honeycomb-like MnO2 nanospheres were synthesized using stainless steel substrates by a facile chemical bath deposition method. The obtained nanospheres were about 200–400 nm in diameter and consisted of porous ultrathin nanosheets. Honeycomb-like MnO2 nanospheres exhibited a high specific capacitance of 240 F g−1 and 87.1% capacitance retention after 1000 cycles at a current density of 0.5 A g−1. These remarkable electrochemical results imply great potential for applications of the honeycomb-like MnO2 nanospheres in supercapacitors.

ACS Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. Honeycomb-like manganese oxide nanospheres for redox supercapacitors. Ionics 2017, 24, 523 -528.

AMA Style

Bal Sydulu Singu, Sang Eun Hong, Kuk Ro Yoon. Honeycomb-like manganese oxide nanospheres for redox supercapacitors. Ionics. 2017; 24 (2):523-528.

Chicago/Turabian Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. 2017. "Honeycomb-like manganese oxide nanospheres for redox supercapacitors." Ionics 24, no. 2: 523-528.

Liquid crystals
Published: 13 June 2017 in Molecular Crystals and Liquid Crystals
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In this article, we are prepared that the liquid crystal dimers have aromatic-ester type mesogenic units or aromatic-Schiff base type mesogonic units and confirmed by 1H-NMR spectrometry. The mesomorphic and optical properties of the resultant dimers were studied by differential scanning calorimetry and polarizing optical microscopy.

ACS Style

Joo Hoon Park; Bal Sydulu Singu; Ok Byung Choi; Hwan Myung Lee; Jin Young Lee; Sung Jo Kim; Eun Hee Cha; Seon Nam Park; Myeong Heon Kwak; Bong Keun So; Ran Hee Kim; Soo Min Lee; Kuk Ro Yoon. Liquid crystal dimers having vary oxyethylene flexible spacers. Molecular Crystals and Liquid Crystals 2017, 650, 1 -6.

AMA Style

Joo Hoon Park, Bal Sydulu Singu, Ok Byung Choi, Hwan Myung Lee, Jin Young Lee, Sung Jo Kim, Eun Hee Cha, Seon Nam Park, Myeong Heon Kwak, Bong Keun So, Ran Hee Kim, Soo Min Lee, Kuk Ro Yoon. Liquid crystal dimers having vary oxyethylene flexible spacers. Molecular Crystals and Liquid Crystals. 2017; 650 (1):1-6.

Chicago/Turabian Style

Joo Hoon Park; Bal Sydulu Singu; Ok Byung Choi; Hwan Myung Lee; Jin Young Lee; Sung Jo Kim; Eun Hee Cha; Seon Nam Park; Myeong Heon Kwak; Bong Keun So; Ran Hee Kim; Soo Min Lee; Kuk Ro Yoon. 2017. "Liquid crystal dimers having vary oxyethylene flexible spacers." Molecular Crystals and Liquid Crystals 650, no. 1: 1-6.

Original paper
Published: 08 June 2017 in Journal of Solid State Electrochemistry
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Single phase, ultra-thin, and ultra-long α-MnO2 nanowires were synthesized by facile method and investigated as an electrochemical pseudocapacitor active material. Structural characterizations reveal that the α-MnO2 has a narrow size distribution of ˂5 nm and around 20–30 μm in length. A maximum specific capacitance of 495 F g−1 can be achieved at a scan rate of 2 mV s−1 by cyclic voltametrically. The α-MnO2 nanowires exhibit excellent electrochemical performance at various current densities and good cycling ability. These results indicate that the α-MnO2 nanowires are a promising candidate for the supercapacitor electrode active material.

ACS Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. Ultra-thin and ultra-long ?-MnO2 nanowires for pseudocapacitor material. Journal of Solid State Electrochemistry 2017, 21, 3215 -3220.

AMA Style

Bal Sydulu Singu, Sang Eun Hong, Kuk Ro Yoon. Ultra-thin and ultra-long ?-MnO2 nanowires for pseudocapacitor material. Journal of Solid State Electrochemistry. 2017; 21 (11):3215-3220.

Chicago/Turabian Style

Bal Sydulu Singu; Sang Eun Hong; Kuk Ro Yoon. 2017. "Ultra-thin and ultra-long ?-MnO2 nanowires for pseudocapacitor material." Journal of Solid State Electrochemistry 21, no. 11: 3215-3220.

Journal article
Published: 01 May 2017 in Journal of Industrial and Engineering Chemistry
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ACS Style

Bal Sydulu Singu; Umashankar Male; Palaniappan Srinivasan; Kuk Ro Yoon. Preparation and performance of polyaniline–multiwall carbon nanotubes–titanium dioxide ternary composite electrode material for supercapacitors. Journal of Industrial and Engineering Chemistry 2017, 49, 82 -87.

AMA Style

Bal Sydulu Singu, Umashankar Male, Palaniappan Srinivasan, Kuk Ro Yoon. Preparation and performance of polyaniline–multiwall carbon nanotubes–titanium dioxide ternary composite electrode material for supercapacitors. Journal of Industrial and Engineering Chemistry. 2017; 49 ():82-87.

Chicago/Turabian Style

Bal Sydulu Singu; Umashankar Male; Palaniappan Srinivasan; Kuk Ro Yoon. 2017. "Preparation and performance of polyaniline–multiwall carbon nanotubes–titanium dioxide ternary composite electrode material for supercapacitors." Journal of Industrial and Engineering Chemistry 49, no. : 82-87.