Tuning the electronic and optical properties of graphene quantum dots by selective boronization

Feng, Jianguang; Dong, Hua; Pang, Beili; Chen, Yingjie; Yu, Liyan; Dong, Lifeng

doi:10.1039/c8tc03863e

Cited by 59 publications

(34 citation statements)

References 50 publications

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“…The first oxidation peaks associated with the reactions formulated through R2-R4 can be used for evaluating the catalytic activity of the as-prepared GQD electrodes [60]. According to Figure 6a,b, the specific current evaluated at the 1st cycle demonstrates the following order: B-N-codoped GQD (0.98 A g −1 ) > N-doped GQD (0.81 A g −1 ).…”

Section: Gqd-glucose + Oh ↔ Gqd-gluconate + H + + E (R3)mentioning

confidence: 98%

“…Shifting the potential to more positive potentials, the GQD-OH x sites tend to catalyze the dehydrogenated glucose (i.e., GQD-glucose) [60], thus, inducing the first oxidation peak in the positive scan. In the negative potential scan, the reduction of oxidized GQD sites occurs within the potential range of −0.2-0 V (vs. Ag/AgCl).…”

Section: Gqd-glucose + Oh ↔ Gqd-gluconate + H + + E (R3)mentioning

confidence: 99%

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Electrocatalytic Oxidation of Glucose on Boron and Nitrogen Codoped Graphene Quantum Dot Electrodes in Alkali Media

Hsieh

Kao

et al. 2021

Catalysts

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A novel solvothermal technique has been developed in the presence of C/N/B precursor for synthesizing B-N-coped graphene quantum dots (GQDs) as non-metal electrocatalysts towards the catalytic glucose oxidation reaction (GOR). Both N-doped GQD and B-N-codoped GQD particles (~4.0 nm) possess a similar oxidation and amidation level. The B-N-codoped GQD contains a B/C ratio of 3.16 at.%, where the B dopants were formed through different bonding types (i.e., N‒B, C‒B, BC2O, and BCO2) inserted into or decorated on the GQDs. The cyclic voltammetry measurement revealed that the catalytic activity of B-N-codoped GQD catalyst is significantly higher compared to the N-doped GQDs (~20% increase). It was also shown that the GOR activity was substantially enhanced due to the synergistic effect of B and N dopants within the GQD catalysts. Based on the analysis of Tafel plots, the B-N-codoped-GQD catalyst electrode displays an ultra-high exchange current density along with a reduced Tafel slope. The application of B-N-codoped GQD electrodes significantly enhances the catalytic activity and results in facile reaction kinetics towards the glucose oxidation reaction. Accordingly, the novel design of GQD catalyst demonstrated in this work sets the stage for designing inexpensive GQD-based catalysts as an alternative for precious metal catalysts commonly used in bio-sensors, fuel cells, and other electrochemical devices.

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Section: Gqd-glucose + Oh ↔ Gqd-gluconate + H + + E (R3)mentioning

confidence: 98%

Section: Gqd-glucose + Oh ↔ Gqd-gluconate + H + + E (R3)mentioning

confidence: 99%

Electrocatalytic Oxidation of Glucose on Boron and Nitrogen Codoped Graphene Quantum Dot Electrodes in Alkali Media

Hsieh

Kao

et al. 2021

Catalysts

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“…GQDs have a surface area for interaction, as well as having good edge atoms to interact other structures [39]. Furthermore, the bandgap adjusting feature and electron transport capacity of GQDs with varying sizes may be used in nanoelectronics devices and as optoelectronic materials [40]. As a result, PVC/MO/GQD, in its four forms: ATRI, AHEX, ZTRI, and ZHEX, was created to combine with the highest PVC/MO enhanced structure.…”

Section: Building Model Moleculementioning

confidence: 99%

Experimental and Theoretical Approaches for Polyvinylchloride Enhanced with Metal Oxides/Graphene

Ezzat

Hegazy

Yahia

et al. 2022

Preprint

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Introducing graphene (G) into the polymer matrix is supposed to improve both the electrical and optical characteristics, especially in space applications. To study the effect of metal oxide and G on PVC, a matrix of PVC/ZnO/G nanocomposite was prepared and studied using different spectroscopic techniques. As a consequence, the Fourier Transform Infrared (FTIR) spectra for PVC/ZnO/G revealed two significant bands at 1596 cm-1 and 515 cm-1, G and ZnO, respectively, confirming the composite synthesis. Also, X-ray Diffraction (XRD) and Field-emission Scanning Electron Microscopy (FESEM) result confirmed the interaction between PVC, ZnO, and G. Density functional theory (DFT) calculations were performed at B3LYPL/LAN2DZ on PVC nanocomposites with various metal oxides such as MgO, SiO2, TiO2, NiO, CuO, ZnO, and ZrO2 and then reinforced with graphene quantum dots (GQDs). The findings of the HOMO/LUMO band gap energy, total dipole moment (TDM), and Molecular Electrostatic Potential (MESP) indicated that the effect of MgO in the presence of GQD gives a nanocomposite with high electronic characteristics with a TDM of 16.675 Debye ∆E 0.231 eV. The distinctive properties of such nanocomposite PVC/MgO/GQD ZTRI C46 enabling usage in optical and electrical components and systems, as well as anti-reflection coating applications for solar cells.

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“…Doping with heteroatoms (like N, S, B, P, and F) is an active method to vary the optical properties of the GQDs, and doping with N, S, F on GQDs can lead to open up a small bandgap in its electronic structure. 59,67 The heteroatom doping on the GQDs manipulate its electronic structure, chemical structure, and surface defects state that result in variation of optical properties. 68 PL spectra give information about the number of photons emitted whereas the absorption spectra exhibit light absorption.…”

Section: Optical Propertiesmentioning

confidence: 99%

Recent advances in heteroatom-doped graphene quantum dots for sensing applications

2021

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Tuning the electronic and optical properties of graphene quantum dots by selective boronization

Abstract: BC3, BCO2, and BC2O show different behaviours in tuning the electronic and optical properties of boron-doped graphene quantum dots.

Cited by 59 publications

References 50 publications

Electrocatalytic Oxidation of Glucose on Boron and Nitrogen Codoped Graphene Quantum Dot Electrodes in Alkali Media

Electrocatalytic Oxidation of Glucose on Boron and Nitrogen Codoped Graphene Quantum Dot Electrodes in Alkali Media

Experimental and Theoretical Approaches for Polyvinylchloride Enhanced with Metal Oxides/Graphene

Recent advances in heteroatom-doped graphene quantum dots for sensing applications

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