A general method for the synthesis of graphene-metal sulphide nanosheets

Zeng, Bin; Liu, Wanfeng; Zeng, Wujun; Jin, Can

doi:10.1007/s11051-018-4162-1

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Similarly, Zeng et al reported that the synthesis and photocatalytic activity of (Cd,Cu) sulphide/graphene composite for MO degradation under UV light irradiation. These reports clearly suggested that the composite material showed higher degradation efficiency than that of the pure materials [22,23]. In the present study, CuS nanoflowers is selected to dope into CdS believing that nanoflower morphology would greatly reduce the charge recombination process that the pure CdS.…”

Section: Introductionmentioning

confidence: 82%

Synthesis and Characterization of CuS/CdS Photocatalyst with Enhanced Visible Light-Photocatalytic Activity

Arumugam

Madhavan

2017

JNanoR

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In the present study, visible light active CuS/CdS nanocomposites of various compositions (1%, 2% and 3%) were synthesized via wet impregnation method and these photocatalysts were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and UV-visible diffuse reflectance spectroscopy (DRS). The photocatalytic degradation efficiency of the synthesized photocatalysts was evaluated from the degradation of methylene blue (MB) under the visible light irradiation. Among all compositions, a 1% CuS/CdS nanocomposite showed about 89.5% degradation in 90 min than the pure CuS, CdS and other composites. Photoluminescence and photoelectrochemical measurements indicated that the 1% CuS/CdS nanocomposite greatly enhanced the charge generation and restrained the recombination of photogenerated electron-hole pairs. A possible mechanism of photocatalytic degradation has been proposed.

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Section: Introductionmentioning

confidence: 82%

Synthesis and Characterization of CuS/CdS Photocatalyst with Enhanced Visible Light-Photocatalytic Activity

Arumugam

Madhavan

2017

JNanoR

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“…The high photocatalytic activity was attributed to the flower-like morphology, which increased the life span of photogenerated charge carriers and utilized the sunlight efficiently [9] . However, the photocatalytic activity of CuS by itself is rather limited due to the fast recombination of photogenerated charge carriers [10] . Therefore, developing strategies to promote the effective photogenerated charge separation of CuS is of great importance.…”

Section: Introductionmentioning

confidence: 99%

CdS NANOPARTICLE-DECORATED CuS MICROFLOWER-2D GRAPHENE HYBRIDS AND THEIR ENHANCED PHOTOCATALYTIC PERFORMANCE

LI¹,

ZENG²

2021

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CdS nanoparticles decorated CuS microflower-2D graphene hybrids (CdS/CuS-MF/G) were synthesized in environmentally friendly route and applied as photocatalysts. Composites were characterized with various techniques to investigate their morphology, structure, and optical properties. Photocatalytic activity of samples was evaluated by methyl orange (MO) degradation, and the sample reached photocatalytic efficiency of 84.8% in 120 min. The cause of enhanced photocatalytic activity was attributed to heterojunction in CuS/CdS and excellent electronic conductivity of graphene, which formed three-level electron transfer process. This results in enhanced photogenerated charge carrier separation in composites. Due to high photocatalytic efficiency, as-prepared photocatalyst could encourage further development regarding its application in photocatalytic water treatment.

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“…Although solution based techniques have been used to form graphene flakes, NGr and their heterojunctions [33][34][35][36][37][38], the highest quality graphene is still primarily obtained by chemical vapor deposition (CVD) on catalytic metal substrates. The extended delocalization of π-electrons in large area CVD-grown NGr has enabled electron mobilities of 1000 cm 2 V −1 s −1 to 9000 cm 2 V −1 s −1 to be measured in such NGr films [39,40].…”

Section: Introductionmentioning

confidence: 99%

CVD grown nitrogen doped graphene is an exceptional visible-light driven photocatalyst for surface catalytic reactions

et al. 2019

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The photocatalytic potential of large area CVD grown nitrogen doped graphene (NGr) has been explored though the chemical transformation of 4-nitrobenzene thiol into p,p′-dimercaptoazobenzene. Decoration of NGr with Ag nanocubes with rounded edges to form NGr/Ag nanohybrids resulted in a slight increase in the work-function and a decrease in the n-type character of NGr due to ground state transfer of negative charge from NGr to Ag. The Ag nanocubes exhibited a localized surface plasmon resonance (LSPR) at ~425 nm. When the NGr/Ag nanohybrids were illuminated with visible light of wavelength close to the LSPR peak, Kelvin probe force microscopy (KPFM) indicated a dramatic change in surface potential of −225 mV and Raman spectra detected electron accumulation in NGr, which are attributed to a high local field enhancement-mediated hot electron injection into NGr and the formation of long-lived charge separated states. Pristine nitrogen doped graphene and its coupled system with plasmonic Ag nanoparticles showed superior photocatalytic performance compared to bare plasmonic Ag catalyst. While standalone Ag NPs were unable to complete the transformation of 4-NBT into DMAB even at a laser power of 10 mW, NGr/Ag nanohybrids completed this transformation at a laser power of 1 mW, pointing to the high photoreduction strength of NGr/Ag. Density functional theory (DFT) based computational modeling was used to examine the electronic structure of graphene doped with graphitic, pyridinic and pyrrolic nitrogen dopant atoms. DFT results indicated an enhanced chemical reactivity of NGr due to stronger localization of charge at the dopant sites and a pronounced difference in the projected density of states (PDOS) for carbon atoms in proximity to, and distant from, the nitrogen dopant sites.

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A general method for the synthesis of graphene-metal sulphide nanosheets

Cited by 3 publications

References 17 publications

Synthesis and Characterization of CuS/CdS Photocatalyst with Enhanced Visible Light-Photocatalytic Activity

Synthesis and Characterization of CuS/CdS Photocatalyst with Enhanced Visible Light-Photocatalytic Activity

CdS NANOPARTICLE-DECORATED CuS MICROFLOWER-2D GRAPHENE HYBRIDS AND THEIR ENHANCED PHOTOCATALYTIC PERFORMANCE

CVD grown nitrogen doped graphene is an exceptional visible-light driven photocatalyst for surface catalytic reactions

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