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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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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1725463710082793472 |