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Seung Hyun Hur
School of Chemical Engineering, University of Ulsan, Daehak-ro 93, Nam-gu, Ulsan, 44610, South Korea

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Journal article
Published: 27 August 2021 in International Journal of Hydrogen Energy
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Strategies to decrease the dehydrogenation enthalpy (ΔHd) of dibenzyl toluene (DBT) were examined by density functional theory (DFT) modeling. The stronger electron-donating substituent showed higher hydrogen-releasing properties. The sequences of the dehydrogenation process of perhydro-dibenzyl toluene (18H-DBT) and perhydro-lithium 3,5-dibenzyl phenolate (18H-DBT-OLi), which is the compound of modified DBT with the highest potential, were the same. The energy required to release hydrogen from 18H-DBT-OLi (11.514 kcal/mol) was smaller than that from 18H-DBT (12.574 kcal/mol). In the hydrogen-releasing process, the rate-determining steps for the dehydrogenation of 18H-DBT and 18H-DBT-OLi were the 12H-DBT → 10H-DBT + H2 and 12H-DBT-OLi → 10H-DBT-OLi + H2 steps, respectively. Furthermore, the charge distribution of 18H-DBT and 18H-DBT-OLi was also explored.

ACS Style

Ngoc-Diem Huynh; Seung Hyun Hur; Sung Gu Kang. Tuning the dehydrogenation performance of dibenzyl toluene as liquid organic hydrogen carriers. International Journal of Hydrogen Energy 2021, 1 .

AMA Style

Ngoc-Diem Huynh, Seung Hyun Hur, Sung Gu Kang. Tuning the dehydrogenation performance of dibenzyl toluene as liquid organic hydrogen carriers. International Journal of Hydrogen Energy. 2021; ():1.

Chicago/Turabian Style

Ngoc-Diem Huynh; Seung Hyun Hur; Sung Gu Kang. 2021. "Tuning the dehydrogenation performance of dibenzyl toluene as liquid organic hydrogen carriers." International Journal of Hydrogen Energy , no. : 1.

Journal article
Published: 31 May 2021 in Applied Surface Science
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The oxygen evolution reaction (OER), owing to its sluggish nature, demands efficient and stable catalysts with low production cost, during the electrocatalytic water splitting. In this respect, a series of bimetallic ZnO-Ni(OH)2 composite materials were prepared as electrode materials for OER. The synthetic procedure followed the polyvinylpyrrolidone (PVP) and dopamine (DA) assisted hydrothermal process. The growth modification ability of PVP and adhesive property of polydopamine (from DA) were utilized to attain the 3D interconnected structures. The precursor concentrations were varied to obtain most efficient catalyst, ZNDP-1. In alkaline medium, ZNDP-1 showed a low over potential of 170 mV (@10 mAcm−2 current density) and a Tafel slope of 61 mV dec−1 with significant stability. The surface defects, porosity and synergism within metal centers might cause efficient electrocatalytic activity. Furthermore, DFT studies were performed to understand the mechanistic pathway.

ACS Style

Jayasmita Jana; K.C. Bhamu; Yen-Linh Thi Ngo; Sung Gu Kang; Jin Suk Chung; Seung Hyun Hur. Designing a bimetallic transition metal oxide/hydroxide composite for effective electrocatalytic oxygen evolution reaction. Applied Surface Science 2021, 562, 150253 .

AMA Style

Jayasmita Jana, K.C. Bhamu, Yen-Linh Thi Ngo, Sung Gu Kang, Jin Suk Chung, Seung Hyun Hur. Designing a bimetallic transition metal oxide/hydroxide composite for effective electrocatalytic oxygen evolution reaction. Applied Surface Science. 2021; 562 ():150253.

Chicago/Turabian Style

Jayasmita Jana; K.C. Bhamu; Yen-Linh Thi Ngo; Sung Gu Kang; Jin Suk Chung; Seung Hyun Hur. 2021. "Designing a bimetallic transition metal oxide/hydroxide composite for effective electrocatalytic oxygen evolution reaction." Applied Surface Science 562, no. : 150253.

Journal article
Published: 03 May 2021 in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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High quantum yield 3-aminophenylboronic acid-functionalized nitrogen-doped carbon dots (GAAP-CDs) were fabricated using a simple hydrothermal route and used as a sensing probe for toxic hypochlorite (ClO−). The as-synthesized GAAP-CDs showed absorption peaks at 252, 297, and 370 nm and an emission peak at 375 nm with an excitation wavelength of 310 nm. The quantum yield of GAAP-CDs reached 58.28%, with no noticeable fluorescence change observed under high ionic strength conditions and a three-month long-term test. GAAP-CDs-based ClO− sensing was carried out by UV−vis absorbance and fluorescence spectroscopy; the detection limit was as low as 0.77 μM (linear range of 0−100 μM), and 0.50 μM (linear range of 0.1−100 μM), respectively. In addition, the as-synthesized GAAP-CDs showed excellent selectivity towards ClO− ions in the presence of various interfering chemicals. The satisfactory results from the proposed method of ClO− detection in tap water and drinking water samples, suggesting promising application of GAAP-CDs for ClO− detection.

ACS Style

Linlin Wang; Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. High quantum yield aminophenylboronic acid-functionalized N-doped carbon dots for highly selective hypochlorite ion detection. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2021, 260, 119895 .

AMA Style

Linlin Wang, Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur. High quantum yield aminophenylboronic acid-functionalized N-doped carbon dots for highly selective hypochlorite ion detection. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 2021; 260 ():119895.

Chicago/Turabian Style

Linlin Wang; Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. 2021. "High quantum yield aminophenylboronic acid-functionalized N-doped carbon dots for highly selective hypochlorite ion detection." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 260, no. : 119895.

Journal article
Published: 22 April 2021 in Catalysts
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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: 12 April 2021 in Current Applied Physics
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A transition metal (Zn) and alkaline earth metal (Ca)-hybridized metal-organic framework (MOF) based electrocatalyst was synthesized using a one-pot process. The as-prepared ZnCa-MOF74 (ZC) catalyst exhibited a low overpotential, an excellent CO selectivity, and high stability in the electrochemical reduction of CO2 (ERC). The Faradaic efficiency of ZC towards CO was as high as 93%, which is two times higher than that of the Zn-MOF74 catalyst. The computational simulation also showed that Ca lowered the activation barrier of the rate-determining step during the ERC.

ACS Style

Tran Van Phuc; Sung Gu Kang; Jin Suk Chung; Seung Hyun Hur. Highly CO selective Ca and Zn hybrid metal-organic framework electrocatalyst for the electrochemical reduction of CO2. Current Applied Physics 2021, 27, 31 -37.

AMA Style

Tran Van Phuc, Sung Gu Kang, Jin Suk Chung, Seung Hyun Hur. Highly CO selective Ca and Zn hybrid metal-organic framework electrocatalyst for the electrochemical reduction of CO2. Current Applied Physics. 2021; 27 ():31-37.

Chicago/Turabian Style

Tran Van Phuc; Sung Gu Kang; Jin Suk Chung; Seung Hyun Hur. 2021. "Highly CO selective Ca and Zn hybrid metal-organic framework electrocatalyst for the electrochemical reduction of CO2." Current Applied Physics 27, no. : 31-37.

Journal article
Published: 18 January 2021 in Materials Research Bulletin
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Cu- and Zn-MOF74 were synthesized using the nitrate salts of Cu and Zn combined with 2,5-dihydroxyterephtalic acid (H4DOBBDC) by a simple solvothermal method. The as-prepared Cu- and Zn-MOF74 were used as electrocatalysts for the electrochemical reduction CO2 using a H-type cell in a 0.1 M of KHCO3 aqueous solution. The Cu-MOF74 exhibited a larger surface area, higher CO selectivity, smaller Tafel slope, and lower overpotential than those of Zn-MOF74. A computational simulation showed that the lower activation energy of Cu-MOF74 than that of Zn-MOF74 in the rate-determining step resulted in better electrocatalytic properties.

ACS Style

Tran Van Phuc; Sung Gu Kang; Jin Suk Chung; Seung Hyun Hur. Highly selective Metal-Organic Framework-based electrocatalyst for the Electrochemical Reduction of CO2 to CO. Materials Research Bulletin 2021, 138, 111228 .

AMA Style

Tran Van Phuc, Sung Gu Kang, Jin Suk Chung, Seung Hyun Hur. Highly selective Metal-Organic Framework-based electrocatalyst for the Electrochemical Reduction of CO2 to CO. Materials Research Bulletin. 2021; 138 ():111228.

Chicago/Turabian Style

Tran Van Phuc; Sung Gu Kang; Jin Suk Chung; Seung Hyun Hur. 2021. "Highly selective Metal-Organic Framework-based electrocatalyst for the Electrochemical Reduction of CO2 to CO." Materials Research Bulletin 138, no. : 111228.

Journal article
Published: 16 January 2021 in Nanomaterials
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Herein, a feasible and effective approach is developed to build an electrically conductive and double percolation network-like structure via the incorporation of highly reduced graphene oxide (HRGO) into a polymer blend of diglycidyl ether of bisphenol A/polyetherimide (DGEBA/PEI). With the assistance of the curing reaction-induced phase separation (CRIPS) technique, an interconnected network of HRGO is formed in the phase-separated structure of the DGEBA/PEI polymer blend due to selective localization behavior. In this study, HRGO was prepared from a unique chemical reduction technique. The DGEBA/PEI/HRGO nanocomposite was analyzed in terms of phase structure by content of PEI and low weight fractions of HRGO (0.5 wt.%). The HRGO delivered a high electrical conductivity in DGEBA/PEI polyblends, wherein the value increased from 5.03 × 10−16 S/m to 5.88 S/m at a low content of HRGO (0.5 wt.%). Furthermore, the HRGO accelerated the curing reaction process of CRIPS due to its amino group. Finally, dynamic mechanical analyses (DMA) were performed to understand the CRIPS phenomenon and selective localization of HRGO reinforcement. The storage modulus increased monotonically from 1536 MPa to 1660 MPa for the 25 phr (parts per hundred in the DGEBA) PEI polyblend and reached 1915 MPa with 0.5 wt.% HRGO reinforcement. These simultaneous improvements in electrical conductivity and dynamic mechanical properties clearly demonstrate the potential of this conductive polyblend for various engineering applications.

ACS Style

Yiming Meng; Sushant Sharma; Wenjun Gan; Seung Hur; Won Choi; Jin Chung. Construction and Mechanism Analysis of a Self-Assembled Conductive Network in DGEBA/PEI/HRGO Nanocomposites by Controlling Filler Selective Localization. Nanomaterials 2021, 11, 228 .

AMA Style

Yiming Meng, Sushant Sharma, Wenjun Gan, Seung Hur, Won Choi, Jin Chung. Construction and Mechanism Analysis of a Self-Assembled Conductive Network in DGEBA/PEI/HRGO Nanocomposites by Controlling Filler Selective Localization. Nanomaterials. 2021; 11 (1):228.

Chicago/Turabian Style

Yiming Meng; Sushant Sharma; Wenjun Gan; Seung Hur; Won Choi; Jin Chung. 2021. "Construction and Mechanism Analysis of a Self-Assembled Conductive Network in DGEBA/PEI/HRGO Nanocomposites by Controlling Filler Selective Localization." Nanomaterials 11, no. 1: 228.

Nano express
Published: 03 December 2020 in Nanoscale Research Letters
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In this research, we report the green, blue, and orange color emitting N-doped carbon dots (CDs), which are being synthesized from ascorbic acid and o-/m-/p-phenylenediamine (o-PDA, m-PDA, and p-PDA, respectively). The effects of the solvent polarity and solution pH on the PL emission properties of the as-synthesized CDs have been systematically investigated. It has been observed that the PL emission of the as-synthesized CDs decreases with the increase in solvent polarity due to the greater agglomeration. The surface charge of CDs also shows prominent effects on the pH-dependent PL emission properties.

ACS Style

Linlin Wang; Won Mook Choi; Jin Suk Chung; Seung Hyun Hur. Multicolor Emitting N-Doped Carbon Dots Derived from Ascorbic Acid and Phenylenediamine Precursors. Nanoscale Research Letters 2020, 15, 1 -10.

AMA Style

Linlin Wang, Won Mook Choi, Jin Suk Chung, Seung Hyun Hur. Multicolor Emitting N-Doped Carbon Dots Derived from Ascorbic Acid and Phenylenediamine Precursors. Nanoscale Research Letters. 2020; 15 (1):1-10.

Chicago/Turabian Style

Linlin Wang; Won Mook Choi; Jin Suk Chung; Seung Hyun Hur. 2020. "Multicolor Emitting N-Doped Carbon Dots Derived from Ascorbic Acid and Phenylenediamine Precursors." Nanoscale Research Letters 15, no. 1: 1-10.

Journal article
Published: 30 November 2020 in Dyes and Pigments
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The water-soluble N-doped carbon dots (NCDs) are designed by simple hydrothermal treatment of aqueous mixture of citric acid and urea. The initially prepared NCDs are further been passivated by l-glutathione (GSH) through carbodiimide-activated coupling reaction to enhance the emissive properties of the NCDs. The as-obtained passivated carbon dots (GSH-NCDs) show intense blue emission at 440 nm when excited at 355 nm. However, this emission is observed to be quenched selectively in the presence of dopamine (DA) leading to design a platform for DA detection. The quenching of fluorescence of GSH-NCDs is dependent on DA concentration. The limit of detection is 1.01 nM, with a linear detection ranges from 20 nM to 10 μM (R2 = 0.992). The average lifetime values and the spectral profile of GSH-NCDs in absence and presence of DA indicate the possibility of photoinduced electron transfer assisted inner filter effect mechanism for the DA induced quenching of GSH-NCDs’ fluorescence. Further experiments show that the as-designed DA detection technique works successfully for biological fluids.

ACS Style

Linlin Wang; Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. Glutathione modified N-doped carbon dots for sensitive and selective dopamine detection. Dyes and Pigments 2020, 186, 109028 .

AMA Style

Linlin Wang, Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur. Glutathione modified N-doped carbon dots for sensitive and selective dopamine detection. Dyes and Pigments. 2020; 186 ():109028.

Chicago/Turabian Style

Linlin Wang; Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. 2020. "Glutathione modified N-doped carbon dots for sensitive and selective dopamine detection." Dyes and Pigments 186, no. : 109028.

Journal article
Published: 21 November 2020 in Analytica Chimica Acta
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A new strategy for the fluorescent and colorimetric sensing of hydrogen peroxide (H2O2) and glucose based on the metal oxide – carbon-dot hybrid structure was investigated. The sensing system is related to the catalytic oxidation reaction of glucose-by-glucose oxidase (GOx) to H2O2. In this study, a metal oxide hybrid with nitrogen-doped carbon dots (MFNCDs) that showed intrinsic peroxidase-like activity was synthesized and used as a catalyst instead of GOx to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to blue-emitting oxidized TMB (oxTMB) in the presence of hydrogen peroxide (H2O2). The fluorescence of MFNCDs/TMB at 405 nm was quenched in the presence of H2O2 through the inner filter effect (IFE) and electron transfer within MFNCDs, oxTMB, and glucose system. Therefore, the fluorescence and absorbance intensity can be applied to the quantitative determination of the concentration of H2O2 and glucose with a wide linear range. The detection limit for H2O2 and glucose based on the colorimetric method were as low as 84 nM and 0.41 μM, respectively. In contrast, the detection limit for H2O2 and glucose based on the fluorescent method were as low as 97 nM and 0.85 μM, respectively. Furthermore, the colorimetric readout on the paper device based on the changing color of the solution could also be integrated with a smartphone platform to conduct the on-site analysis of glucose without the use of the spectrometer. In addition, this dual sensor can be applied to detect glucose in real serum with highly accurate results, making it a good candidate for biosensor applications.

ACS Style

Yen-Linh Thi Ngo; Phi Luan Nguyen; Jayasmita Jana; Won Mook Choi; Jin Suk Chung; Seung Hyun Hur. Simple paper-based colorimetric and fluorescent glucose sensor using N-doped carbon dots and metal oxide hybrid structures. Analytica Chimica Acta 2020, 1147, 187 -198.

AMA Style

Yen-Linh Thi Ngo, Phi Luan Nguyen, Jayasmita Jana, Won Mook Choi, Jin Suk Chung, Seung Hyun Hur. Simple paper-based colorimetric and fluorescent glucose sensor using N-doped carbon dots and metal oxide hybrid structures. Analytica Chimica Acta. 2020; 1147 ():187-198.

Chicago/Turabian Style

Yen-Linh Thi Ngo; Phi Luan Nguyen; Jayasmita Jana; Won Mook Choi; Jin Suk Chung; Seung Hyun Hur. 2020. "Simple paper-based colorimetric and fluorescent glucose sensor using N-doped carbon dots and metal oxide hybrid structures." Analytica Chimica Acta 1147, no. : 187-198.

Journal article
Published: 12 November 2020 in Journal of Alloys and Compounds
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The design of non-noble metal-based nanocomposites for the evolution of hydrogen gas in energy conversion devices is important ongoing research. In this study, carbon dot (CD) based bi-metallic hydroxide nanocomposites were synthesized for the electrocatalytic hydrogen evolution reaction. A series of nickel-cobalt double hydroxide nanocomposites were synthesized using a CD support. The structural features of the nanoparticles were analyzed through proper microscopic studies. The overpotential was −234 mV vs. Ag/AgCl electrode (−25 mV with respect to RHE) for the hydrogen evolution reaction at a current density of 10 mA cm−2. The Tafel slope was calculated to be 47 mV dec−1. The catalytic properties were attributed to the intrinsic layered structure, interconnected nanoarray configuration, and unique redox characteristics. CDs, with significant surface defects provided a higher active area for catalysis and electronic environment. This study highlights the use of a CD support for the synthesis of low-cost metal hydroxide electrocatalyst.

ACS Style

Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. Carbon dot supported bimetallic nanocomposite for the hydrogen evolution reaction. Journal of Alloys and Compounds 2020, 859, 157895 .

AMA Style

Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur. Carbon dot supported bimetallic nanocomposite for the hydrogen evolution reaction. Journal of Alloys and Compounds. 2020; 859 ():157895.

Chicago/Turabian Style

Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. 2020. "Carbon dot supported bimetallic nanocomposite for the hydrogen evolution reaction." Journal of Alloys and Compounds 859, no. : 157895.

Journal article
Published: 09 November 2020 in Applied Sciences
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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.

Erratum
Published: 11 September 2020 in Journal of Power Sources
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ACS Style

Lijun Sui; Wei An; Yonghao Feng; Zeming Wang; Jingwen Zhou; Seung Hyun Hur. Corrigendum to “Bimetallic Pd-Based surface alloys promote electrochemical oxidation of formic acid: Mechanism, kinetics and descriptor” [J. Power Sources 451 (2020) 227830]. Journal of Power Sources 2020, 481, 228880 .

AMA Style

Lijun Sui, Wei An, Yonghao Feng, Zeming Wang, Jingwen Zhou, Seung Hyun Hur. Corrigendum to “Bimetallic Pd-Based surface alloys promote electrochemical oxidation of formic acid: Mechanism, kinetics and descriptor” [J. Power Sources 451 (2020) 227830]. Journal of Power Sources. 2020; 481 ():228880.

Chicago/Turabian Style

Lijun Sui; Wei An; Yonghao Feng; Zeming Wang; Jingwen Zhou; Seung Hyun Hur. 2020. "Corrigendum to “Bimetallic Pd-Based surface alloys promote electrochemical oxidation of formic acid: Mechanism, kinetics and descriptor” [J. Power Sources 451 (2020) 227830]." Journal of Power Sources 481, no. : 228880.

Original article
Published: 09 September 2020 in Carbon Letters
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Nitrogen-doped carbon dots (CDts) with tunable fluorescence properties in aqueous media were synthesized hydrothermally. The excitation wavelength variation to obtain the maximum emission produced a blue shift in the emission peaks upon dilution in an aqueous solution. The shift can be explained by a re-absorption phenomenon in a concentrated solution. The interparticle interaction within was responsible to show dilution-dependent optical behavior. The as-synthesized solution of CDts did not show any prominent absorption peak over a wide range. However, upon dilution, two peaks became predominant. The concentration-dependent behavior was observed during the interaction with metal cations. Cationic salts of Co(II) and Hg(II) caused quenching at different dilutions of CDts. This might be explained by the exposure of different surface functional groups during dilution and metal-ion–CDts charge transfer. The quenched fluorescence of CDts was rescued using ascorbic acid. Therefore, the one-pot detection of Co(II)/Hg(II) and ascorbic acid was designed through a ‘Turn Off/On’ phenomenon.

ACS Style

Jayasmita Jana; Seung Hyun Hur. Concentration-dependent emission of nitrogen-doped carbon dots and its use in hazardous metal-ion detection. Carbon Letters 2020, 31, 523 -536.

AMA Style

Jayasmita Jana, Seung Hyun Hur. Concentration-dependent emission of nitrogen-doped carbon dots and its use in hazardous metal-ion detection. Carbon Letters. 2020; 31 (3):523-536.

Chicago/Turabian Style

Jayasmita Jana; Seung Hyun Hur. 2020. "Concentration-dependent emission of nitrogen-doped carbon dots and its use in hazardous metal-ion detection." Carbon Letters 31, no. 3: 523-536.

Journal article
Published: 31 August 2020 in Journal of Electrochemical Science and Technology
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ACS Style

Jayasmita Jana; Yen-Linh Thi Ngo; Jin Suk Chung; Seung Hyun Hur. Contribution of Carbon Dot Nanoparticles in Electrocatalysis: Development in Energy Conversion Process. Journal of Electrochemical Science and Technology 2020, 11, 220 -237.

AMA Style

Jayasmita Jana, Yen-Linh Thi Ngo, Jin Suk Chung, Seung Hyun Hur. Contribution of Carbon Dot Nanoparticles in Electrocatalysis: Development in Energy Conversion Process. Journal of Electrochemical Science and Technology. 2020; 11 (3):220-237.

Chicago/Turabian Style

Jayasmita Jana; Yen-Linh Thi Ngo; Jin Suk Chung; Seung Hyun Hur. 2020. "Contribution of Carbon Dot Nanoparticles in Electrocatalysis: Development in Energy Conversion Process." Journal of Electrochemical Science and Technology 11, no. 3: 220-237.

Article
Published: 20 August 2020 in Korean Journal of Chemical Engineering
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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: 30 July 2020 in Current Applied Physics
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Carbon dots (CDs) have unique optoelectronic properties and are considered efficient fluorescent probes as organic dyes, semiconducting quantum dots, metallic clusters, etc. A carbon dot-dye system has been established to study alternative photoelectric conversion processes. For this purpose, a CuO-associated CD was synthesized using a green chemical method. The energy conversion efficiency was monitored using a cationic, anionic, and neutral dye. The nature of the dye has an important effect on the energy transfer process. This limitation from its electrostatic nature was overcome by introducing a surfactant into the system. Both positively and negatively charged surfactants were used in this study. The nature of the surfactant was found to have a significant effect on the energy transfer process within positively charged CDs and organic dyes. The individual interactions within surfactant-CD and surfactant-dye system can cause modification. This CD-dye-surfactant system with further modifications can be used appropriately in dye-sensitized solar cells.

ACS Style

Jayasmita Jana; Ik Keun Yoo; Jin Suk Chung; Seung Hyun Hur. Effect of surfactant surface nature on the energy transfer efficiency (η) of a carbon dot-dye system. Current Applied Physics 2020, 20, 1058 -1065.

AMA Style

Jayasmita Jana, Ik Keun Yoo, Jin Suk Chung, Seung Hyun Hur. Effect of surfactant surface nature on the energy transfer efficiency (η) of a carbon dot-dye system. Current Applied Physics. 2020; 20 (9):1058-1065.

Chicago/Turabian Style

Jayasmita Jana; Ik Keun Yoo; Jin Suk Chung; Seung Hyun Hur. 2020. "Effect of surfactant surface nature on the energy transfer efficiency (η) of a carbon dot-dye system." Current Applied Physics 20, no. 9: 1058-1065.

Journal article
Published: 05 May 2020 in Materials Research Bulletin
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An extremely sensitive colorimetric glucose sensor was fabricated using a novel hybrid nanostructure comprised of manganese ferrite oxide– graphitic carbon nitride (MnFe2O4/g-C3N4). A neural network-based glucose analytical smartphone application can be used to easily monitor the glucose concentration with a high accuracy by only taking images with the smartphone camera. The as-synthesized MnFe2O4/g-C3N4 exhibited a very high affinity toward 3,3′,5,5′-tetramethylbenzidine (TMB) and H2O2, as calculated via Michaelis-Menten kinetics. The glucose sensors using as-synthesized MnFe2O4/g-C3N4 exhibit a wide linear range and very low detection limits of 20.5 nM for H2O2 and 17.3 nM for glucose, which are one of the lowest values ever reported. The instrumental analysis with XPS, XRD, and TEM revealed that MnFe2O4/g-C3N4 had a highly crystalline structure of MnFe2O4 and g-C3N4 with abundant oxygen vacancies and well-developed hybrid structures, which might result in excellent catalytic activity and glucose sensitivity.

ACS Style

Yen-Linh Thi Ngo; Phi Luan Nguyen; Won Mook Choi; Jin Suk Chung; Seung Hyun Hur. Highly sensitive smartphone-integrated colorimetric glucose sensor based on MnFe2O4 – graphitic carbon nitride hybrid nanostructure. Materials Research Bulletin 2020, 129, 110910 .

AMA Style

Yen-Linh Thi Ngo, Phi Luan Nguyen, Won Mook Choi, Jin Suk Chung, Seung Hyun Hur. Highly sensitive smartphone-integrated colorimetric glucose sensor based on MnFe2O4 – graphitic carbon nitride hybrid nanostructure. Materials Research Bulletin. 2020; 129 ():110910.

Chicago/Turabian Style

Yen-Linh Thi Ngo; Phi Luan Nguyen; Won Mook Choi; Jin Suk Chung; Seung Hyun Hur. 2020. "Highly sensitive smartphone-integrated colorimetric glucose sensor based on MnFe2O4 – graphitic carbon nitride hybrid nanostructure." Materials Research Bulletin 129, no. : 110910.

Journal article
Published: 04 April 2020 in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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High performance sensors can be produced by adequately designing the chemical structure and uncovering the actual detection mechanism. In this study, a fluorescent probe was synthesized for various nitroaromatic molecules, including stereochemically varied nitrophenols and nitroaniline. A systematic investigation of the influence of various analytes on the luminescence behavior of the as-synthesized carbon dot (CDs) revealed the inner-filter effect to be the major detection mechanism. The extinction coefficient and spectral overlap were found to be the critical parameters for high sensitivity and good selectivity rather than the functional groups of the CDs and analytes.

ACS Style

Hye Jin Lee; Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. Uncovering the actual inner-filter effect between highly efficient carbon dots and nitroaromatics. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2020, 236, 118342 .

AMA Style

Hye Jin Lee, Jayasmita Jana, Jin Suk Chung, Seung Hyun Hur. Uncovering the actual inner-filter effect between highly efficient carbon dots and nitroaromatics. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 2020; 236 ():118342.

Chicago/Turabian Style

Hye Jin Lee; Jayasmita Jana; Jin Suk Chung; Seung Hyun Hur. 2020. "Uncovering the actual inner-filter effect between highly efficient carbon dots and nitroaromatics." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 236, no. : 118342.

Journal article
Published: 02 March 2020 in Applied Sciences
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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.