Synthesis of graphene quantum dots for their supramolecular polymorphic architectures

Chen, Weifeng; Lv, Guo; Zhou, Qing; Shen, Jialu; Cao, Jie; Liu, Xiang; Dai, Zhongxu

doi:10.1007/s12274-020-3236-4

Cited by 14 publications

(12 citation statements)

References 25 publications

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“…The SEM image (Figure B) illustrates a layer-by-layer stacking feature at the edge of N-rGO with a width of ∼2 μm. The driving force to form this stacking composition should be mostly π–π and hydrogen bonds . From the high-magnification N 1s X-ray photoelectron spectrum (XPS) (Figure C), three peaks at 397.8, 399.6, and 401.2 eV are observed, which correspond to PD-N, PR-N, and QN-N, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The driving force to form this stacking composition should be mostly π−π and hydrogen bonds. 30 From the high-magnification N 1s X-ray photoelectron spectrum (XPS) (Figure 2C), three peaks at 397.8, 399.6, and 401.2 eV are observed, which correspond to PD-N, PR-N, and QN-N, respectively. The contents of PR-N and PD-N are calculated to be 74.6 and 10.2%, respectively, which are higher than those at normal N-rGO (PR-N: 36.11%; PD-N: 30.64%).…”

Section: Resultsmentioning

confidence: 99%

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High Spatial Resolution Electrochemical Microscopic Observation of Enhanced Charging under Bias at Active Sites of N-rGO

Jin

Cheng

Lü

et al. 2021

ACS Appl. Energy Mater.

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Recent breakthrough reveals that the activation free energy decreases with the amount of the oxidative charge stored at the catalyst, which gives an insight into the role of chemistry vs bias in electrocatalysis. In this study, non-faradic and faradic currents from the total currents in the image of scanning electrochemical cell microscopy (SECCM) are isolated to realize the mapping of charge accumulation and electrochemical activity with a resolution of ∼135 nm. Enhanced charging under bias is observed at the active sites of N-doped graphene oxide (N-rGO) with high electrochemical activity in the hydrogen evolution reaction (HER), providing direct evidence to support the mechanism as mentioned above. This established electrochemical imaging method and the collected result could provide more effective information about the electrochemical mechanism of the HER performance, which is significant for the design of high HER catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High Spatial Resolution Electrochemical Microscopic Observation of Enhanced Charging under Bias at Active Sites of N-rGO

Jin

Cheng

Lü

et al. 2021

ACS Appl. Energy Mater.

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“…There are two peaks at 1384 and 1586 cm −1 in the Raman spectrum (Figure 2a), attributed to the disordered carbon (D-band) and the graphitic carbon (G-band), respectively. 21 The peak of the G-band is much higher than that of the D-band (ID/IG = 0.59), indicating that the GQDs possess perfect lattice structures with less defects. Additionally, the Raman spectrum of Rh@GQDs was measured for comparison (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 97%

Demonstration of Controlled Hydrogen Release Using Rh@GQDs during Hydrolysis of NH₃BH₃

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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Achieving the controlled release of H 2 through an effective approach still faces many challenges. Herein, high-quality graphene quantum dots (GQDs) are synthesized from a new precursor, 1,2,4-trihydroxy benzene, and a multifunctional platform of Rh@GQDs is further developed for the controlled H 2 evolution upon the hydrolysis of NH 3 BH 3 (AB). More importantly, the designing concepts of multistep and stepless speed controls have been introduced in the domains of both H 2 evolution for the first time. Through a novel designing protocol, the rate of H 2 evolution can be freely regulated and constantly varied on demand by means of chelation between Zn 2+ and ethylene diamine tetraacetic acid (EDTA). The density functional theory calculation indicates that Zn 2+ has the priority to be adsorbed onto Rh(100) due to its larger adsorption energy (107.98 kcal•mol −1 ) than that of AB (36.36 kcal•mol −1 ). A controlling mechanism is presented such that Zn 2+ will cover the active sites of the nanocatalyst to prevent the H 2 evolution, and EDTA can chelate Zn 2+ to reactivate the nanocatalyst for the production of H 2 , greatly facilitating use of this strategy in other catalytic reactions. Moreover, it is demonstrated that the protocol is equally valid for diverse hydrogen storage materials. Therefore, this work not only establishes whole new concepts for the controlled production of H 2 but also explains their mechanism, thus remarkably advancing the utilization of H 2 energy and significantly enlightening the controlled process of catalysis.

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“…GQDs of one to three layers with narrow size distribution were synthesized from m-trihydroxybenzene through green hydrothermal reaction (Chen et al, 2020). The reaction mixture comprises only m-trihydroxybenzene and water, avoiding the introduction of any strong acids or metal impurities.…”

Section: Hydrothermal and Solvothermal Synthesismentioning

confidence: 99%

Recent progress on graphene quantum dots‐based fluorescence sensors for food safety and quality assessment applications

Sharma

Ali

Devaraj

et al. 2021

Comp Rev Food Sci Food Safe

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The versatile photophysicalproperties, high surface-to-volume ratio, superior photostability, higher biocompatibility, and availability of active sites make graphene quantum dots (GQDs) an ideal candidate for applications in sensing, bioimaging, photocatalysis, energy storage, and flexible electronics. GQDsbased sensors involve luminescence sensors, electrochemical sensors, optical biosensors, electrochemical biosensors, and photoelectrochemical biosensors.Although plenty of sensing strategies have been developed using GQDs for biosensing and environmental applications, the use of GQDs-based fluorescence techniques remains unexplored or underutilized in the field of food science and technology. To the best of our knowledge, comprehensive review of the GQDsbased fluorescence sensing applications concerning food quality analysis has not yet been done. This review article focuses on the recent progress on the synthesis strategies, electronic properties, and fluorescence mechanisms of GQDs.The various GQDs-based fluorescence detection strategies involving Förster resonance energy transfer-or inner filter effect-driven fluorescence turn-on and turn-off response mechanisms toward trace-level detection of toxic metal ions, toxic adulterants, and banned chemical substances in foodstuffs are summarized. The challenges associated with the pretreatment steps of complex food matrices and prospects and challenges associated with the GQDs-based fluorescent probes are discussed. This review could serve as a precedent for further advancement in interdisciplinary research involving the development of versatile GQDs-based fluorescent probes toward food science and technology applications.

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Synthesis of graphene quantum dots for their supramolecular polymorphic architectures

Cited by 14 publications

References 25 publications

High Spatial Resolution Electrochemical Microscopic Observation of Enhanced Charging under Bias at Active Sites of N-rGO

High Spatial Resolution Electrochemical Microscopic Observation of Enhanced Charging under Bias at Active Sites of N-rGO

Demonstration of Controlled Hydrogen Release Using Rh@GQDs during Hydrolysis of NH₃BH₃

Recent progress on graphene quantum dots‐based fluorescence sensors for food safety and quality assessment applications

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Synthesis of graphene quantum dots for their supramolecular polymorphic architectures

Cited by 14 publications

References 25 publications

High Spatial Resolution Electrochemical Microscopic Observation of Enhanced Charging under Bias at Active Sites of N-rGO

High Spatial Resolution Electrochemical Microscopic Observation of Enhanced Charging under Bias at Active Sites of N-rGO

Demonstration of Controlled Hydrogen Release Using Rh@GQDs during Hydrolysis of NH3BH3

Recent progress on graphene quantum dots‐based fluorescence sensors for food safety and quality assessment applications

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Demonstration of Controlled Hydrogen Release Using Rh@GQDs during Hydrolysis of NH₃BH₃