Engineering highly graphitic carbon quantum dots by catalytic dehydrogenation and carbonization of Ti3C2Tx-MXene wrapped polystyrene spheres

Chen, Haoran; Meng, Wei-Ming; Wang, Riyuan; Chen, Fanglin; Li, Tao; Wang, Dingding; Wang, Feng; Zhu, San‐E; Wei, Chaoliang; Lu, Hongdian; Yang, Wei

doi:10.1016/j.carbon.2022.01.028

Cited by 59 publications

(8 citation statements)

References 59 publications

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“…The surface morphology of a CQD thin film before contact with DA is depicted in Figure 3 a, where the 2D image shows the random distribution of CQDs on an Au substrate. The 3D AFM image ( Figure 3 c) of Au/CQD film in the absence of DA shows that the maximum height of CQD peaks was 7.4 nm, which is consistent with previous studies [ 70 ]. However, it is obvious from Figure 3 b that DA adsorption on the sensor chip influenced the surface morphology.…”

Section: Resultssupporting

confidence: 91%

Direct and Sensitive Detection of Dopamine Using Carbon Quantum Dots Based Refractive Index Surface Plasmon Resonance Sensor

et al. 2022

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Abnormality of dopamine (DA), a vital neurotransmitter in the brain’s neuronal pathways, causes several neurological diseases. Rapid and sensitive sensors for DA detection are required for early diagnosis of such disorders. Herein, a carbon quantum dot (CQD)-based refractive index surface plasmon resonance (SPR) sensor was designed. The sensor performance was evaluated for various concentrations of DA. Increasing DA levels yielded blue-shifted SPR dips. The experimental findings revealed an excellent sensitivity response of 0.138°/pM in a linear range from 0.001 to 100 pM and a high binding affinity of 6.234 TM−1. The effects of varied concentrations of DA on the optical characteristics of CQD thin film were further proved theoretically. Increased DA levels decreased the thickness and real part of the refractive index of CQD film, according to fitting results. Furthermore, the observed reduction in surface roughness using AFM demonstrated that DA was bound to the sensor layer. This, in turn, explained the blue shift in SPR reflectance curves. This optical sensor offers great potential as a trustworthy solution for direct measurement due to its simple construction, high sensitivity, and other sensing features.

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Section: Resultssupporting

confidence: 91%

Direct and Sensitive Detection of Dopamine Using Carbon Quantum Dots Based Refractive Index Surface Plasmon Resonance Sensor

et al. 2022

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“…The amount of H 2 produced (about 4 μmol h –1 ) is negligible compared with that of the PTC system. There is no sustained growth of hydrogen observed after reaction of 5 and 8 h, indicating that C-MF has a good thermal stability and is not prone to pyrolysis dehydrogenation. , …”

Section: Resultsmentioning

confidence: 93%

“…There is no sustained growth of hydrogen observed after reaction of 5 and 8 h, indicating that C-MF has a good thermal stability and is not prone to pyrolysis dehydrogenation. 35,36 To further understand the intrinsic relationship between thermal effect and hydrogen production, the Gibbs free energy (ΔG) of hydrogen evolution reaction is calculated by density functional theory (DFT) (Figure 4a), including three parts: adsorption of water molecules, adsorption of hydrogen atoms, and H 2 produced by photocatalytic reaction. The temperature changes affect the adsorption of H 2 O and H* in the first and second steps.…”

Section: Resultsmentioning

confidence: 99%

Integrated Coupling Utilization of the Solar Full Spectrum for Promoting Water Splitting Activity over a CIZS Semiconductor

Ding,

Li,

et al. 2023

ACS Nano

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Most of the existing photocatalysts can only use ultraviolet light and part of visible light, so broadening the spectrum response range and realizing the full spectrum coverage are key measures to improve the solar-to-hydrogen (STH) efficiency of photocatalytic water splitting. A spatially separated photothermal coupled photocatalytic (PTC) reaction system was designed using carbonized melamine foam (C-MF) as a substrate to absorb visible and infrared light and Cu0.04In0.25ZnS y @Ru (CIZS@Ru) as a photocatalyst to absorb UV–visible light (UV–vis). By comparing the three modes of bottom, liquid level, and self-floating, it is found that the surface temperature of the system has a significant effect on the hydrogen evolution activity. The monochromatic light and activation energy experiments verify that the enhancement of photocatalytic activity comes from the strengthened photothermal effect of the substrate. Combined with theoretical calculations, it is further confirmed that the introduction of photothermal materials provides additional kinetic energy for carrier transmission and promotes directional carrier transmission efficiency. Based on the photoenergy–thermal integrated catalytic strategy, the hydrogen production rate reaches 603 mmol h–1 m–2. The structural design of photocatalysis has potential application in the field of photoenergy–fuel conversion.

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“…There has been a significant increase in recent years in the amount of research being done on the PL of CQDs, which is one of the most exciting characteristics of CQDs and has been used in the field of photocatalysis ( Chen et al, 2022 ; Peng et al, 2022 ). The PL emission pattern is similar to the Stokes type emission pattern in that the PL emission wavelength is longer than the excitation wavelength of the laser.…”

Section: Properties Of Cqdsmentioning

confidence: 99%

Recent Progress on Carbon Quantum Dots Based Photocatalysis

Jung

Sapner

Adhikari³

et al. 2022

Front. Chem.

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Engineering highly graphitic carbon quantum dots by catalytic dehydrogenation and carbonization of Ti3C2Tx-MXene wrapped polystyrene spheres

Cited by 59 publications

References 59 publications

Direct and Sensitive Detection of Dopamine Using Carbon Quantum Dots Based Refractive Index Surface Plasmon Resonance Sensor

Direct and Sensitive Detection of Dopamine Using Carbon Quantum Dots Based Refractive Index Surface Plasmon Resonance Sensor

Integrated Coupling Utilization of the Solar Full Spectrum for Promoting Water Splitting Activity over a CIZS Semiconductor

Recent Progress on Carbon Quantum Dots Based Photocatalysis

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