Photocatalytic activity of ZnO/graphene core-shell structure and its mechanism study

Xiaoyu Yang; Chao Wang; Dexiong Hong; Mingliang Fang; Liang Cai; Ling Chen; Wensheng Yan

doi:10.3969/j.issn.0253.2014.08.005

Photocatalytic activity of ZnO/graphene core-shell structure and its mechanism study

Xiaoyu Yang^*, Chao Wang, Dexiong Hong, Mingliang Fang, Liang Cai, Ling Chen, Wensheng Yan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The ZnO@RGO quasi-core-shell composite photocatalyst, where ZnO nanoparticles (NPs) were wrapped by graphene nanoshells, was prepared via a one-step method. Photocatalytic experiments indicated that the photodegradation efficiency of ZnO@RGO on methylene blue (MB) increased by about 10 times compared to that of ZnO NPs. ZnO nanocrystals with the particle size of about 6 nm wrapped by RGO (reduced graphene oxide) nanosheets could be observed in transmission electron microscopy (TEM) images. X-ray diffraction (XRD) patterns showed that the structure of ZnO was hexagonal wurtzite. X-ray photoelectron spectroscopy (XPS) and Raman scattering manifested that there was strong interfacial interaction between ZnO and graphene which introduced about 3 % interfacial stress and quantities of oxygen vacancies (V_o). Photoluminescence (PL) further evidenced the approximately 80% decrease in band-gap emission intensity in ZnO@RGO compared with that in ZnO and the presence of interfacial V_o Finally, the mechanism of the enhanced photocatalytic activity in ZnO@RGO was proposed. The effective synergetic capture of graphene nanoshells and V_o as a result of interfacial strain interaction improves the photocatalytic activities of ZnO based semiconductor photocatalysts.

Original language	Chinese (Traditional)
Pages (from-to)	661-666
Number of pages	6
Journal	Journal of University of Science and Technology of China
Volume	44
Issue number	8
DOIs	https://doi.org/10.3969/j.issn.0253.2014.08.005
State	Published - 2014

Keywords

Core-shell
Degradation
Graphene
Nanoparticle
Photocatalytic activity
ZnO

ASJC Scopus subject areas

Mechanical Engineering

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title = "Photocatalytic activity of ZnO/graphene core-shell structure and its mechanism study",

abstract = "The ZnO@RGO quasi-core-shell composite photocatalyst, where ZnO nanoparticles (NPs) were wrapped by graphene nanoshells, was prepared via a one-step method. Photocatalytic experiments indicated that the photodegradation efficiency of ZnO@RGO on methylene blue (MB) increased by about 10 times compared to that of ZnO NPs. ZnO nanocrystals with the particle size of about 6 nm wrapped by RGO (reduced graphene oxide) nanosheets could be observed in transmission electron microscopy (TEM) images. X-ray diffraction (XRD) patterns showed that the structure of ZnO was hexagonal wurtzite. X-ray photoelectron spectroscopy (XPS) and Raman scattering manifested that there was strong interfacial interaction between ZnO and graphene which introduced about 3 % interfacial stress and quantities of oxygen vacancies (Vo). Photoluminescence (PL) further evidenced the approximately 80% decrease in band-gap emission intensity in ZnO@RGO compared with that in ZnO and the presence of interfacial Vo Finally, the mechanism of the enhanced photocatalytic activity in ZnO@RGO was proposed. The effective synergetic capture of graphene nanoshells and Vo as a result of interfacial strain interaction improves the photocatalytic activities of ZnO based semiconductor photocatalysts.",

keywords = "Core-shell, Degradation, Graphene, Nanoparticle, Photocatalytic activity, ZnO",

author = "Xiaoyu Yang and Chao Wang and Dexiong Hong and Mingliang Fang and Liang Cai and Ling Chen and Wensheng Yan",

year = "2014",

doi = "10.3969/j.issn.0253.2014.08.005",

language = "Chinese (Traditional)",

volume = "44",

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publisher = "China University of Science and Technology",

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T1 - Photocatalytic activity of ZnO/graphene core-shell structure and its mechanism study

AU - Yang, Xiaoyu

AU - Wang, Chao

AU - Hong, Dexiong

AU - Fang, Mingliang

AU - Cai, Liang

AU - Chen, Ling

AU - Yan, Wensheng

PY - 2014

Y1 - 2014

N2 - The ZnO@RGO quasi-core-shell composite photocatalyst, where ZnO nanoparticles (NPs) were wrapped by graphene nanoshells, was prepared via a one-step method. Photocatalytic experiments indicated that the photodegradation efficiency of ZnO@RGO on methylene blue (MB) increased by about 10 times compared to that of ZnO NPs. ZnO nanocrystals with the particle size of about 6 nm wrapped by RGO (reduced graphene oxide) nanosheets could be observed in transmission electron microscopy (TEM) images. X-ray diffraction (XRD) patterns showed that the structure of ZnO was hexagonal wurtzite. X-ray photoelectron spectroscopy (XPS) and Raman scattering manifested that there was strong interfacial interaction between ZnO and graphene which introduced about 3 % interfacial stress and quantities of oxygen vacancies (Vo). Photoluminescence (PL) further evidenced the approximately 80% decrease in band-gap emission intensity in ZnO@RGO compared with that in ZnO and the presence of interfacial Vo Finally, the mechanism of the enhanced photocatalytic activity in ZnO@RGO was proposed. The effective synergetic capture of graphene nanoshells and Vo as a result of interfacial strain interaction improves the photocatalytic activities of ZnO based semiconductor photocatalysts.

AB - The ZnO@RGO quasi-core-shell composite photocatalyst, where ZnO nanoparticles (NPs) were wrapped by graphene nanoshells, was prepared via a one-step method. Photocatalytic experiments indicated that the photodegradation efficiency of ZnO@RGO on methylene blue (MB) increased by about 10 times compared to that of ZnO NPs. ZnO nanocrystals with the particle size of about 6 nm wrapped by RGO (reduced graphene oxide) nanosheets could be observed in transmission electron microscopy (TEM) images. X-ray diffraction (XRD) patterns showed that the structure of ZnO was hexagonal wurtzite. X-ray photoelectron spectroscopy (XPS) and Raman scattering manifested that there was strong interfacial interaction between ZnO and graphene which introduced about 3 % interfacial stress and quantities of oxygen vacancies (Vo). Photoluminescence (PL) further evidenced the approximately 80% decrease in band-gap emission intensity in ZnO@RGO compared with that in ZnO and the presence of interfacial Vo Finally, the mechanism of the enhanced photocatalytic activity in ZnO@RGO was proposed. The effective synergetic capture of graphene nanoshells and Vo as a result of interfacial strain interaction improves the photocatalytic activities of ZnO based semiconductor photocatalysts.

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KW - Degradation

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Photocatalytic activity of ZnO/graphene core-shell structure and its mechanism study

Abstract

Keywords

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