期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 724, 期 -, 页码 121-129出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.07.017
关键词
SnO2; Micro-nanostructure; Formaldehyde; Gas sensor
资金
- National Science Foundation of China [61674065, 11474124]
In this work, well-defined cedar-like SnO2 hierarchical micro-nanostructures have been successfully synthesized through a facile low-temperature hydrothermal method. XRD, SEM, TEM and HRTEM were carried out to investigate morphology and structure of as-obtained products. The morphology can be tailored by modulating the reaction temperature and annealing temperature. It is observed that the cedar-like SnO2 micro-nanostructure are composed of two parts: the trunk and leaves. The trunk is composed of a hexagonal-pyramid, and the leaves are constructed by numerous ordered triquetrous nanosheets. As-fabricated cedar-like SnO2 micro-nanostructure based sensors exhibit fast response time (<1 s)/recovery time (13 s), high sensitivity, good repeatability, and good sensing selectivity towards formaldehyde gas at lower working temperatures. A possible reaction formation mechanism of the cedar-like micro-nanostructure and a morphology-dependent sensing mechanism are proposed. (C) 2017 Elsevier B.V. All rights reserved.
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