Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 2, Pages 3138-3144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.10.103
Keywords
Polycrystalline ZnO two-dimensional nanosheets; Ag nanoparticles; Heterostructure; Ethanol sensors; Ultrahigh sensitivity
Categories
Funding
- National Natural Science Foundation of China [11332013, 51202302]
- Japan society for the promotion of science (JSPS)
- CAS under Japan-China Scientific Cooperation Program
- Shorai Foundation for Science and Technology
- Fundamental Research Funds for Central Universities [106112015CDJXY130013]
- Chongqing Graduate Student Scientific Research Innovation Project [CYS14011]
- [15H04114]
- [15K14117]
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Noble metals decorated two-dimensional nanostructures with a large surface-to-volume ratio raise substantial promise for many technological applications particularly for high-performance chemical sensing. Here, we design and synthesize a hierarchical heterojunction comprising ultrathin two-dimensional polycrystalline ZnO nanosheets on a large scale, which serve as reaction positions for reduced gases, and uniformly dispersed Ag nanoparticles to enhance reaction activity. We find that the Ag nanoparticles in the heterostructural system act as strong electron acceptors, inducing remarkable surface space charge layers. As a result, the heterostructural system shows significantly improved gas-sensing performance to ethanol as compared to pure ZnO. Such metal nanoparticles decorated two-dimensional polycrystalline ZnO nanosheets can be applied in not only as gas-sensing but also catalytic and photocatalytic fields. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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