Facile synthesis cedar-like SnO2 hierarchical micro-nanostructures with improved formaldehyde gas sensing characteristics

JOURNAL OF ALLOYS AND COMPOUNDS

卷:724

Article

Yu, Hai^1,2  Yang, Tianye¹  Wang, Zhiyang³  Li, Zhifang¹  Xiao, Bingxin¹  Zhao, Qi¹  Zhang, Mingzhe¹ 

[1] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Jilin, Peoples R China

[2] Tonghua Normal Univ, Coll Phys, Tonghua 134000, Peoples R China

[3] Changchun Univ Sci & Technol, Sch Sci, Changchun 130022, Jilin, Peoples R China

关键词: SnO2;    Micro-nanostructure;    Formaldehyde;    Gas sensor;   

DOI  :  10.1016/j.jallcom.2017.07.017

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free