Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances

ZnS-graphene quantum dot (GQDs) composites were synthesized by a simple solvothermal method, in which GQDs were prepared by a hydrothermal cutting process. The products were characterized by transmission electron microscopy, atomic force microscopy, X-ray diffraction and ultraviolet-visible absorpti...

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Main Authors: Zheng Zhang, Chengyi Fang, Xin Bing, Yun Lei
Format: Article
Language:English
Published: MDPI AG 2018-03-01
Series:Materials
Subjects:
Online Access:http://www.mdpi.com/1996-1944/11/4/512
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spelling doaj-1b157006773846dfbd29b5417fde88c42020-11-24T23:55:12ZengMDPI AGMaterials1996-19442018-03-0111451210.3390/ma11040512ma11040512Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric PerformancesZheng Zhang0Chengyi Fang1Xin Bing2Yun Lei3School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, ChinaZnS-graphene quantum dot (GQDs) composites were synthesized by a simple solvothermal method, in which GQDs were prepared by a hydrothermal cutting process. The products were characterized by transmission electron microscopy, atomic force microscopy, X-ray diffraction and ultraviolet-visible absorption spectroscopy. The results show that GQDs were obtained by size tailoring of 1–4 graphene layers and combined with cubic ZnS nanoparticles to form ZnS-GQDs composites. The photocurrent and electrochemical behavior of the products were evaluated by transient photocurrent responses and electrochemical impedance spectra. The photocurrent density of ZnS-GQDs achieves the value of 2.32 × 10−5 A/cm2, which is 2.4-times as high as that of ZnS-graphene. GQDs serve as an electrical conducting material, which decreases the conductive path and accelerates the electron transfer. The charge-transfer resistance of ZnS-GQDs is much lower than that of ZnS-graphene and pure ZnS due to the effective electron separation and transfer ability upon the incorporation of GQDs.http://www.mdpi.com/1996-1944/11/4/512GQDsZnS-GQDs compositesphotocurrent responseselectrochemical impedance spectra
collection DOAJ
language English
format Article
sources DOAJ
author Zheng Zhang
Chengyi Fang
Xin Bing
Yun Lei
spellingShingle Zheng Zhang
Chengyi Fang
Xin Bing
Yun Lei
Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances
Materials
GQDs
ZnS-GQDs composites
photocurrent responses
electrochemical impedance spectra
author_facet Zheng Zhang
Chengyi Fang
Xin Bing
Yun Lei
author_sort Zheng Zhang
title Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances
title_short Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances
title_full Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances
title_fullStr Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances
title_full_unstemmed Graphene Quantum Dots-ZnS Nanocomposites with Improved Photoelectric Performances
title_sort graphene quantum dots-zns nanocomposites with improved photoelectric performances
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2018-03-01
description ZnS-graphene quantum dot (GQDs) composites were synthesized by a simple solvothermal method, in which GQDs were prepared by a hydrothermal cutting process. The products were characterized by transmission electron microscopy, atomic force microscopy, X-ray diffraction and ultraviolet-visible absorption spectroscopy. The results show that GQDs were obtained by size tailoring of 1–4 graphene layers and combined with cubic ZnS nanoparticles to form ZnS-GQDs composites. The photocurrent and electrochemical behavior of the products were evaluated by transient photocurrent responses and electrochemical impedance spectra. The photocurrent density of ZnS-GQDs achieves the value of 2.32 × 10−5 A/cm2, which is 2.4-times as high as that of ZnS-graphene. GQDs serve as an electrical conducting material, which decreases the conductive path and accelerates the electron transfer. The charge-transfer resistance of ZnS-GQDs is much lower than that of ZnS-graphene and pure ZnS due to the effective electron separation and transfer ability upon the incorporation of GQDs.
topic GQDs
ZnS-GQDs composites
photocurrent responses
electrochemical impedance spectra
url http://www.mdpi.com/1996-1944/11/4/512
work_keys_str_mv AT zhengzhang graphenequantumdotsznsnanocompositeswithimprovedphotoelectricperformances
AT chengyifang graphenequantumdotsznsnanocompositeswithimprovedphotoelectricperformances
AT xinbing graphenequantumdotsznsnanocompositeswithimprovedphotoelectricperformances
AT yunlei graphenequantumdotsznsnanocompositeswithimprovedphotoelectricperformances
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