This page has only limited features, please log in for full access.

Dr. Jin Suk Chung
School of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Mugeo-dong, Nam-gu, Ulsan, Korea

Basic Info

Basic Info is private.

Research Keywords & Expertise

0 Catalyst
0 Engineering
0 Graphene
0 Hydrogen
0 Nanomaterials

Fingerprints

Graphene
Catalyst
Hydrogen
polymer

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 22 April 2021 in Catalysts
Reads 0
Downloads 0

Pd, Cu, and Zn trimetallic metal-organic framework electrocatalysts (PCZs) based on benzene-1,3,5-tricarboxylic were synthesized using a simple solvothermal synthesis. The as-synthesized PCZ catalysts exhibited as much as 95% faradaic efficiency towards CO, with a high current density, low onset potential, and excellent long-term stability during the electrocatalytic reduction of CO2.

ACS Style

Tran-Van Phuc; Jin-Suk Chung; Seung-Hyun Hur. Highly CO Selective Trimetallic Metal-Organic Framework Electrocatalyst for the Electrochemical Reduction of CO2. Catalysts 2021, 11, 537 .

AMA Style

Tran-Van Phuc, Jin-Suk Chung, Seung-Hyun Hur. Highly CO Selective Trimetallic Metal-Organic Framework Electrocatalyst for the Electrochemical Reduction of CO2. Catalysts. 2021; 11 (5):537.

Chicago/Turabian Style

Tran-Van Phuc; Jin-Suk Chung; Seung-Hyun Hur. 2021. "Highly CO Selective Trimetallic Metal-Organic Framework Electrocatalyst for the Electrochemical Reduction of CO2." Catalysts 11, no. 5: 537.

Journal article
Published: 28 January 2021 in Polymers
Reads 0
Downloads 0

Improving the antibacterial activity of biodegradable materials is crucial for combatting widespread drug-resistant bacteria and plastic pollutants. In this work, we studied polyaniline (PANI)-functionalized zinc oxide nanoparticles (ZnO NPs) to improve surface charges. A PANI-functionalized ZnO NP surface was prepared using a simple impregnation technique. The PANI functionalization of ZnO successfully increased the positive surface charge of the ZnO NPs. In addition, PANI-functionalized ZnO improved mechanical properties and thermal stability. Besides those properties, the water permeability of the bionanocomposite films was decreased due to their increased hydrophobicity. PANI-functionalized ZnO NPs were applied to thermoplastic starch (TPS) films for physical properties and antibacterial studies using Escherichia coli (E. Coli) and Staphylococcus aureus (S. aureus). The PANI-functionalized ZnO bionanocomposite films exhibited excellent antibacterial activity for both E. Coli (76%) and S. aureus (72%). This result suggests that PANI-functionalized ZnO NPs can improve the antibacterial activity of TPS-based bionanocomposite films.

ACS Style

Korakot Charoensri; Chatchai Rodwihok; Duangmanee Wongratanaphisan; Jung Ko; Jin Chung; Hyun Park. Investigation of Functionalized Surface Charges of Thermoplastic Starch/Zinc Oxide Nanocomposite Films Using Polyaniline: The Potential of Improved Antibacterial Properties. Polymers 2021, 13, 425 .

AMA Style

Korakot Charoensri, Chatchai Rodwihok, Duangmanee Wongratanaphisan, Jung Ko, Jin Chung, Hyun Park. Investigation of Functionalized Surface Charges of Thermoplastic Starch/Zinc Oxide Nanocomposite Films Using Polyaniline: The Potential of Improved Antibacterial Properties. Polymers. 2021; 13 (3):425.

Chicago/Turabian Style

Korakot Charoensri; Chatchai Rodwihok; Duangmanee Wongratanaphisan; Jung Ko; Jin Chung; Hyun Park. 2021. "Investigation of Functionalized Surface Charges of Thermoplastic Starch/Zinc Oxide Nanocomposite Films Using Polyaniline: The Potential of Improved Antibacterial Properties." Polymers 13, no. 3: 425.

Journal article
Published: 01 December 2020 in Sensors and Actuators B: Chemical
Reads 0
Downloads 0

Aniline functionalized graphene quantum dots (a-GQDs) is synthesized by microwave-assisted pyrolysis of fructose. After a-GQDs are modulated using phenyl boric acid (PBA), resulting in fluorescence quenching, the a-GQDs/PBA system are employed as a fluorescent turn-on sensor for the glucose detection by the specific reaction of PBA with glucose. The prepared fluorescent sensor using a-GQDs/PBA exhibits high sensitivity and selectivity toward glucose. In addition, the paper-based fluorescent sensor is prepared for portable sensing devices by printing the a-GQDs ink with a commercial inkjet printer, demonstrating a superior visual glucose detection and a good sensitive performance for the detection of glucose in a blood serum and tear samples. Furthermore, the a-GQDs/hydrogel film is evaluated for a wearable sensor as well as fiber optic-based sensor for highly sensitive and fast on-site glucose detection. The prepared fiber optic sensor exhibits remarkable glucose sensing performance with a fast response, a low detection limit of 2.1 μM and excellent recyclability. Finally, the a-GQD/PBA system exhibits excellent biocompatibility and was applied to detect glucose in HeLa cells with satisfactory results. These results provide a novel approach for developing low-cost and flexible sensors for the portable and visual detection of glucose with high sensitivity and selectivity.

ACS Style

Tran Van Tam; Seung Hyun Hur; Jin Suk Chung; Won Mook Choi. Novel paper- and fiber optic-based fluorescent sensor for glucose detection using aniline-functionalized graphene quantum dots. Sensors and Actuators B: Chemical 2020, 329, 129250 .

AMA Style

Tran Van Tam, Seung Hyun Hur, Jin Suk Chung, Won Mook Choi. Novel paper- and fiber optic-based fluorescent sensor for glucose detection using aniline-functionalized graphene quantum dots. Sensors and Actuators B: Chemical. 2020; 329 ():129250.

Chicago/Turabian Style

Tran Van Tam; Seung Hyun Hur; Jin Suk Chung; Won Mook Choi. 2020. "Novel paper- and fiber optic-based fluorescent sensor for glucose detection using aniline-functionalized graphene quantum dots." Sensors and Actuators B: Chemical 329, no. : 129250.

Journal article
Published: 09 November 2020 in Applied Sciences
Reads 0
Downloads 0

In this study, the nanocomposite of g-C3N4 quantum dots/MnCO3 on carbon cloth (q-MC//CC) is prepared via a simple hydrothermal method. The obtained q-MC//CC composite is employed for a flexible supercapacitor electrode. The g-C3N4 quantum dots could effectively improve the interface electrical conductivity and ion transportation of the MnCO3 electrode, which results in superior electrochemical performance. The q-MC//CC electrode delivers a high specific capacity of 1001 F·g−1 at a current density of 1 A·g−1 and a good cycling performance of 96% capacity retention after 5000 cycles. Moreover, an asymmetric flexible supercapacitor (ASC) is assembled with q-MC//CC and carbon cloth as a positive and negative electrode, respectively, which exhibits a high energy density of 27.1 Wh·kg−1 at a power density of 500 W·kg−1. In addition, the fabricated ASC device demonstrates the ability to power the light-emitting diode effectively under mechanical bending.

ACS Style

Di Liu; Seung Hur; Jin Chung; Won Choi. Fabrication of g-C3N4 Quantum Dots/MnCO3 Nanocomposite on Carbon Cloth for Flexible Supercapacitor Electrode. Applied Sciences 2020, 10, 7927 .

AMA Style

Di Liu, Seung Hur, Jin Chung, Won Choi. Fabrication of g-C3N4 Quantum Dots/MnCO3 Nanocomposite on Carbon Cloth for Flexible Supercapacitor Electrode. Applied Sciences. 2020; 10 (21):7927.

Chicago/Turabian Style

Di Liu; Seung Hur; Jin Chung; Won Choi. 2020. "Fabrication of g-C3N4 Quantum Dots/MnCO3 Nanocomposite on Carbon Cloth for Flexible Supercapacitor Electrode." Applied Sciences 10, no. 21: 7927.

Journal article
Published: 02 November 2020 in Journal of Materials Science & Technology
Reads 0
Downloads 0

Functionalization of aniline molecules on zinc oxide (ZnO) nanoparticles is reported using a simple impregnation technique. Functionalized ZnO samples were systematically characterized based on morphology, surface and optical properties, and photocatalytic performance towards methyl orange (MO). Aniline functionalization increased the surface charge of the modified ZnO. Compared to pristine ZnO, the aniline-functionalized ZnO yielded faster photodegradation of MO, degrading 98.29 % of MO in 60 min and superoxide radicals were the major species during the MO photodegradation reaction. These results indicate that the improvement of photocatalytic degradation could be attributed to opposite charge-induced surface adsorption. Hence, protonated amine as a positively charged molecule was expected to increase the surface adsorption of MO (as an anionic dye) on ZnO nanoparticles surfaces, thereby increasing their photocatalytic degradation performance.

ACS Style

Chatchai Rodwihok; Korakot Charoensri; Duangmanee Wongratanaphisan; Won Mook Choi; Seung Hyun Hur; Hyun Jin Park; Jin Suk Chung. Improved photocatalytic activity of surface charge functionalized ZnO nanoparticles using aniline. Journal of Materials Science & Technology 2020, 76, 1 -10.

AMA Style

Chatchai Rodwihok, Korakot Charoensri, Duangmanee Wongratanaphisan, Won Mook Choi, Seung Hyun Hur, Hyun Jin Park, Jin Suk Chung. Improved photocatalytic activity of surface charge functionalized ZnO nanoparticles using aniline. Journal of Materials Science & Technology. 2020; 76 ():1-10.

Chicago/Turabian Style

Chatchai Rodwihok; Korakot Charoensri; Duangmanee Wongratanaphisan; Won Mook Choi; Seung Hyun Hur; Hyun Jin Park; Jin Suk Chung. 2020. "Improved photocatalytic activity of surface charge functionalized ZnO nanoparticles using aniline." Journal of Materials Science & Technology 76, no. : 1-10.

Article
Published: 20 August 2020 in Korean Journal of Chemical Engineering
Reads 0
Downloads 0

A multi-functional NiO/g-C3N4 (NC) hybrid nanostructure was synthesized by a hydrothermal process using melamine and Ni(OH)2 as precursors followed by thermal treatment. The optimal conditions were determined by studying the process conditions, such as the Ni(OH)2 to melamine ratio and thermal treatment temperature. The NC prepared in this study exhibited both excellent glucose sensing properties and supercapacitor properties. A very high glucose sensitivity, as high as 5,387.1 µA mM−1cm−2, and excellent energy density of 49.6 Wh kg−1 at a power density of 1,064.2 W kg−1 were obtained when NC was used as the electrode material for glucose sensing and symmetric supercapacitor, respectively. A flexible glucose sensing device using a flexible substrate and self-powered glucose sensor system that used the same material (NC) for the both power supply and sensing devices were also demonstrated.

ACS Style

Yen-Linh Thi Ngo; Jin Suk Chung; Seung Hyun Hur. Multi-functional NiO/g-C3N4 hybrid nanostructures for energy storage and sensor applications. Korean Journal of Chemical Engineering 2020, 37, 1 -10.

AMA Style

Yen-Linh Thi Ngo, Jin Suk Chung, Seung Hyun Hur. Multi-functional NiO/g-C3N4 hybrid nanostructures for energy storage and sensor applications. Korean Journal of Chemical Engineering. 2020; 37 (9):1-10.

Chicago/Turabian Style

Yen-Linh Thi Ngo; Jin Suk Chung; Seung Hyun Hur. 2020. "Multi-functional NiO/g-C3N4 hybrid nanostructures for energy storage and sensor applications." Korean Journal of Chemical Engineering 37, no. 9: 1-10.

Journal article
Published: 04 June 2020 in Journal of Materials Science & Technology
Reads 0
Downloads 0

Graphene quantum dots (GQDs)/Ni(OH)2 composites on carbon cloth (G-NH//CC) are prepared through simple hydrothermal reactions. The resulting G-NH//CC is employed as a binder-free electrode of supercapacitors. Due to the enhanced electrical conductivity and efficient ion transport by the addition of GQDs, the G-NH//CC electrode exhibits enhanced electrochemical performances. Specifically, the G-NH//CC delivers a maximum specific capacitance of 1825 F·g-1 at a current density of 1 A·g-1 as well as a good cycle stability of 83.5% capacity retention after 8000 cycles. Additionally, all-solid-state symmetric supercapacitor (SSC) is assembled with G-NH//CC composites as both positive and negative electrodes. The fabricated SSC exhibits a high energy density of 80.8 Wh·kg-1 at a power density of 2021 W·kg-1. The present study provides a facile and efficient strategy to prepare high-performance electrode materials for advanced electrochemical energy storage devices.

ACS Style

Yiwen Hong; Jingli Xu; Jin Suk Chung; Won Mook Choi. Graphene quantum dots/Ni(OH)2 nanocomposites on carbon cloth as a binder-free electrode for supercapacitors. Journal of Materials Science & Technology 2020, 58, 73 -79.

AMA Style

Yiwen Hong, Jingli Xu, Jin Suk Chung, Won Mook Choi. Graphene quantum dots/Ni(OH)2 nanocomposites on carbon cloth as a binder-free electrode for supercapacitors. Journal of Materials Science & Technology. 2020; 58 ():73-79.

Chicago/Turabian Style

Yiwen Hong; Jingli Xu; Jin Suk Chung; Won Mook Choi. 2020. "Graphene quantum dots/Ni(OH)2 nanocomposites on carbon cloth as a binder-free electrode for supercapacitors." Journal of Materials Science & Technology 58, no. : 73-79.

Journal article
Published: 02 March 2020 in Applied Sciences
Reads 0
Downloads 0

Cerium-oxide-nanoparticle-decorated zinc oxide was successfully prepared using a simple one-pot hydrothermal technique with different weight% Ce doping. It was found that an increase in Ce doping has an effect on the optical energy band-gap tunability. Ce dopant provides electron trapping on Ce/ZnO nanocomposites and also acts as a surface defect generator during hydrothermal processing. Additionally, a bi-metal oxide heterojunction forms, which acts as a charge separator to obstruct charge recombination and to increase the photodegradation performance. It was found that the methyl orange (MO) degradation performance improved with an increase in Ce doping. The decomposition of MO went from 69.42% (pristine ZnO) to 94.06% (7% Ce/ZnO) after 60 min under fluorescent lamp illumination.

ACS Style

Chatchai Rodwihok; Duangmanee Wongratanaphisan; Tran Van Tam; Won Mook Choi; Seung Hyun Hur; Jin Suk Chung. Cerium-Oxide-Nanoparticle-Decorated Zinc Oxide with Enhanced Photocatalytic Degradation of Methyl Orange. Applied Sciences 2020, 10, 1697 .

AMA Style

Chatchai Rodwihok, Duangmanee Wongratanaphisan, Tran Van Tam, Won Mook Choi, Seung Hyun Hur, Jin Suk Chung. Cerium-Oxide-Nanoparticle-Decorated Zinc Oxide with Enhanced Photocatalytic Degradation of Methyl Orange. Applied Sciences. 2020; 10 (5):1697.

Chicago/Turabian Style

Chatchai Rodwihok; Duangmanee Wongratanaphisan; Tran Van Tam; Won Mook Choi; Seung Hyun Hur; Jin Suk Chung. 2020. "Cerium-Oxide-Nanoparticle-Decorated Zinc Oxide with Enhanced Photocatalytic Degradation of Methyl Orange." Applied Sciences 10, no. 5: 1697.

Journal article
Published: 11 October 2019 in Nanomaterials
Reads 0
Downloads 0

Zinc oxide/reduced graphene oxide nanocomposites (ZnO/rGO) are synthesized via a simple one-pot solvothermal technique. The nanoparticle–nanorod turnability was achieved with the increase in GO additive, which was necessary to control the defect formation. The optimal defect in ZnO/rGO not only increased ZnO/rGO surface and carrier concentration, but also provided the alternative carrier pathway assisted with rGO sheet for electron–hole separation and prolonging carrier recombination. These properties are ideal for photodetection and photocatalytic applications. For photosensing properties, ZnO/rGO shows the improvement of photosensitivity compared with pristine ZnO from 1.51 (ZnO) to 3.94 (ZnO/rGO (20%)). Additionally, applying bending strain on ZnO/rGO enhances its photosensitivity even further, as high as 124% at r = 12.5 mm, due to improved surface area and induced negative piezoelectric charge from piezoelectric effect. Moreover, the photocatalytic activity with methylene blue (MB) was studied. It was observed that the rate of MB degradation was higher in presence of ZnO/rGO than pristine ZnO. Therefore, ZnO/rGO became a promising materials for different applications.

ACS Style

Chatchai Rodwihok; Duangmanee Wongratanaphisan; Yen Linh Thi Ngo; Mahima Khandelwal; Seung Hyun Hur; Jin Suk Chung. Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity. Nanomaterials 2019, 9, 1441 .

AMA Style

Chatchai Rodwihok, Duangmanee Wongratanaphisan, Yen Linh Thi Ngo, Mahima Khandelwal, Seung Hyun Hur, Jin Suk Chung. Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity. Nanomaterials. 2019; 9 (10):1441.

Chicago/Turabian Style

Chatchai Rodwihok; Duangmanee Wongratanaphisan; Yen Linh Thi Ngo; Mahima Khandelwal; Seung Hyun Hur; Jin Suk Chung. 2019. "Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity." Nanomaterials 9, no. 10: 1441.

Review
Published: 22 July 2019 in Applied Sciences
Reads 0
Downloads 0

The indiscriminate disposal of non-biodegradable, heavy metal ionic pollutants from various sources, such as refineries, pulp industries, lead batteries, dyes, and other industrial effluents, into the aquatic environment is highly dangerous to the human health as well as to the environment. Among other heavy metals, lead (Pb(II)) ions are some of the most toxic pollutants generated from both anthropogenic and natural sources in very large amounts. Adsorption is the simplest, efficient and economic water decontamination technology. Hence, nanoadsorbents are a major focus of current research for the effective and selective removal of Pb(II) metal ions from aqueous solution. Nanoadsorbents based on graphene and its derivatives play a major role in the effective removal of toxic Pb(II) metal ions. This paper summarizes the applicability of graphene and functionalized graphene-based composite materials as Pb(II) ions adsorbent from aqueous solutions. In addition, the synthetic routes, adsorption process, conditions, as well as kinetic studies have been reviewed.

ACS Style

Mukesh Kumar; Jin Suk Chung; Seung Hyun Hur. Graphene Composites for Lead Ions Removal from Aqueous Solutions. Applied Sciences 2019, 9, 2925 .

AMA Style

Mukesh Kumar, Jin Suk Chung, Seung Hyun Hur. Graphene Composites for Lead Ions Removal from Aqueous Solutions. Applied Sciences. 2019; 9 (14):2925.

Chicago/Turabian Style

Mukesh Kumar; Jin Suk Chung; Seung Hyun Hur. 2019. "Graphene Composites for Lead Ions Removal from Aqueous Solutions." Applied Sciences 9, no. 14: 2925.

Full paper
Published: 27 May 2019 in Advanced Energy Materials
Reads 0
Downloads 0

Herein, a facile, one‐step hydrothermal route to synthesize novel all‐carbon‐based composites composed of B‐doped graphene quantum dots anchored on a graphene hydrogel (GH‐BGQD) is demonstrated. The obtained GH‐BGQD material has a unique 3D architecture with high porosity and large specific surface area, exhibiting abundant catalytic active sites of B‐GQDs as well as enhanced electrolyte mass transport and ion diffusion. Therefore, the prepared GH‐BGQD composites exhibit a superior trifunctional electrocatalytic activity toward the oxygen reduction reaction, oxygen evolution reaction, and hydrogen evolution reaction with excellent long‐term stability and durability comparable to those of commercial Pt/C and Ir/C catalysts. A flexible solid‐state Zn–air battery using a GH‐BGQD air electrode achieves an open‐circuit voltage of 1.40 V, a stable discharge voltage of 1.23 V for 100 h, a specific capacity of 687 mAh g−1, and a peak power density of 112 mW cm−2. Also, a water electrolysis cell using GH‐BGQD electrodes delivers a current density of 10 mA cm−2 at cell voltage of 1.61 V, with remarkable stability during 70 h of operation. Finally, the trifunctional GH‐BGQD catalyst is employed for water electrolysis cell powered by the prepared Zn–air batteries, providing a new strategy for the carbon‐based multifunctional electrocatalysts for electrochemical energy devices.

ACS Style

Tran Van Tam; Sung Gu Kang; Mun Ho Kim; Seung Geol Lee; Seung Hyun Hur; Jin Suk Chung; Won Mook Choi. Novel Graphene Hydrogel/B‐Doped Graphene Quantum Dots Composites as Trifunctional Electrocatalysts for Zn−Air Batteries and Overall Water Splitting. Advanced Energy Materials 2019, 1 .

AMA Style

Tran Van Tam, Sung Gu Kang, Mun Ho Kim, Seung Geol Lee, Seung Hyun Hur, Jin Suk Chung, Won Mook Choi. Novel Graphene Hydrogel/B‐Doped Graphene Quantum Dots Composites as Trifunctional Electrocatalysts for Zn−Air Batteries and Overall Water Splitting. Advanced Energy Materials. 2019; ():1.

Chicago/Turabian Style

Tran Van Tam; Sung Gu Kang; Mun Ho Kim; Seung Geol Lee; Seung Hyun Hur; Jin Suk Chung; Won Mook Choi. 2019. "Novel Graphene Hydrogel/B‐Doped Graphene Quantum Dots Composites as Trifunctional Electrocatalysts for Zn−Air Batteries and Overall Water Splitting." Advanced Energy Materials , no. : 1.

Nano express
Published: 10 June 2015 in Nanoscale Research Letters
Reads 0
Downloads 0

Pt/C catalyst used for polymer electrolyte membrane fuel cells (PEMFCs) displays excellent initial performance, but it does not last long because of the lack of durability. In this study, a Pt/reduced graphene oxide (RGO) catalyst was synthesized by the polyol method using ethylene glycol (EG) as the reducing agent, and then low-temperature hydrogen bubbling (LTHB) treatment was introduced to enhance the durability of the Pt/RGO catalyst. The cyclic voltammetry (CV), oxygen reduction reaction (ORR) analysis, and transmittance electron microscopy (TEM) results suggested that the loss of the oxygen functional groups, because of the hydrogen spillover and self-catalyzed dehydration reaction during LTHB, reduced the carbon corrosion and Pt agglomeration and thus enhanced the durability of the electrocatalyst.

ACS Style

Kang Gyu Sun; Jin Suk Chung; Seung Hyun Hur. Durability Improvement of Pt/RGO Catalysts for PEMFC by Low-Temperature Self-Catalyzed Reduction. Nanoscale Research Letters 2015, 10, 963 .

AMA Style

Kang Gyu Sun, Jin Suk Chung, Seung Hyun Hur. Durability Improvement of Pt/RGO Catalysts for PEMFC by Low-Temperature Self-Catalyzed Reduction. Nanoscale Research Letters. 2015; 10 (1):963.

Chicago/Turabian Style

Kang Gyu Sun; Jin Suk Chung; Seung Hyun Hur. 2015. "Durability Improvement of Pt/RGO Catalysts for PEMFC by Low-Temperature Self-Catalyzed Reduction." Nanoscale Research Letters 10, no. 1: 963.

Journal article
Published: 22 April 2015 in International Journal of Hydrogen Energy
Reads 0
Downloads 0

A novel metal-free electrocatalyst for the oxygen reduction reaction (ORR) is one of the most important issues in fuel cells. Here, we report a facile method to synthesize reduced graphene oxide (rGO) decorated with nitrogen-doped carbon nanowires (rGO-CN) as an electrocatalyst for ORR. After the polymerization of polpyrrole nanowires on the rGO surface (rGO-PPy), the carbonization of rGO-PPy at 800 °C affords a unique nanostructured product by the integration of rGO sheets and the N-doped carbon nanowires with high nitrogen content. The morphology of rGO-CN is confirmed by TEM analysis and the chemical composition and interaction of the prepared samples are analyzed by XPS and FT-IR analysis. The electrocatalytic activity of rGO-CN toward ORR is also evaluated by the cyclic voltammetry. It is found that the rGO-CN electrode shows superior electrocatalytic performance toward ORR, compared to rGO and rGO-PPy, which demonstrates the promising potential of rGO-CN as a carbon-based, metal-free electrocatalyst for enhancing the electrocatalytic property towards ORR.

ACS Style

Kadumudi Firoz Babu; Balasubramaniyan Rajagopalan; Jin Suk Chung; Won Mook Choi. Facile synthesis of graphene/N-doped carbon nanowire composites as an effective electrocatalyst for the oxygen reduction reaction. International Journal of Hydrogen Energy 2015, 40, 6827 -6834.

AMA Style

Kadumudi Firoz Babu, Balasubramaniyan Rajagopalan, Jin Suk Chung, Won Mook Choi. Facile synthesis of graphene/N-doped carbon nanowire composites as an effective electrocatalyst for the oxygen reduction reaction. International Journal of Hydrogen Energy. 2015; 40 (21):6827-6834.

Chicago/Turabian Style

Kadumudi Firoz Babu; Balasubramaniyan Rajagopalan; Jin Suk Chung; Won Mook Choi. 2015. "Facile synthesis of graphene/N-doped carbon nanowire composites as an effective electrocatalyst for the oxygen reduction reaction." International Journal of Hydrogen Energy 40, no. 21: 6827-6834.

Journal article
Published: 02 June 2014 in Sensors and Actuators B: Chemical
Reads 0
Downloads 0

Herein, a facile bottom–up approach for producing nitrogen doped graphene quantum dots (N-GQDs) was carried out by the carbonization of citric acid through hydrothermal treatment in the presence of ammonia and a fluorescent sensor for determination of Fe3+ ions has been demonstrated. These synthesized N-GQDs consist mostly of 1–3 layers having a uniform size of about 3.5 nm, and the nitrogen atoms were successfully introduced into the lattice of graphene quantum dots (GQDs). Due to the introduction of nitrogen atoms, N-GQDs exhibit a bright green luminescence with a higher quantum yield of 30.7%, whereas GQDs show a blue luminescence with a quantum yield of 4.5%. Furthermore, a novel sensor application of N-GQDs was performed for a fluorescent sensing platform for the detection of Fe3+ ions with high sensitivity and selectivity. These N-GQDs are promising for applications for biosensors, biological imaging and optoelectronic devices.

ACS Style

Tran Van Tam; Nguyen Bao Trung; Hye Ryeon Kim; Jin Suk Chung; Won Mook Choi. One-pot synthesis of N-doped graphene quantum dots as a fluorescent sensing platform for Fe3+ ions detection. Sensors and Actuators B: Chemical 2014, 202, 568 -573.

AMA Style

Tran Van Tam, Nguyen Bao Trung, Hye Ryeon Kim, Jin Suk Chung, Won Mook Choi. One-pot synthesis of N-doped graphene quantum dots as a fluorescent sensing platform for Fe3+ ions detection. Sensors and Actuators B: Chemical. 2014; 202 ():568-573.

Chicago/Turabian Style

Tran Van Tam; Nguyen Bao Trung; Hye Ryeon Kim; Jin Suk Chung; Won Mook Choi. 2014. "One-pot synthesis of N-doped graphene quantum dots as a fluorescent sensing platform for Fe3+ ions detection." Sensors and Actuators B: Chemical 202, no. : 568-573.

Journal article
Published: 01 January 2014 in Nanoscale Research Letters
Reads 0
Downloads 0

We report on the grafting of poly(methyl methacrylate) (PMMA) onto the surface of high-density functionalized graphene oxides (GO) through controlled radical polymerization (CRP). To increase the density of surface grafting, GO was first diazotized (DGO), followed by esterification with 2-bromoisobutyryl bromide, which resulted in an atom transfer radical polymerization (ATRP) initiator-functionalized DGO-Br. The functionalized DGO-Br was characterized by X-ray photoelectron spectroscopy (XPS), Raman, and XRD patterns. PMMA chains were then grafted onto the DGO-Br surface through a ‘grafting from’ technique using ATRP. Gel permeation chromatography (GPC) results revealed that polymerization of methyl methacrylate (MMA) follows CRP. Thermal studies show that the resulting graphene-PMMA nanocomposites have higher thermal stability and glass transition temperatures (T g) than those of pristine PMMA.

ACS Style

Mukesh Kumar; Jin Suk Chung; Seung Hyun Hur. Controlled atom transfer radical polymerization of MMA onto the surface of high-density functionalized graphene oxide. Nanoscale Research Letters 2014, 9, 345 -345.

AMA Style

Mukesh Kumar, Jin Suk Chung, Seung Hyun Hur. Controlled atom transfer radical polymerization of MMA onto the surface of high-density functionalized graphene oxide. Nanoscale Research Letters. 2014; 9 (1):345-345.

Chicago/Turabian Style

Mukesh Kumar; Jin Suk Chung; Seung Hyun Hur. 2014. "Controlled atom transfer radical polymerization of MMA onto the surface of high-density functionalized graphene oxide." Nanoscale Research Letters 9, no. 1: 345-345.