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RESEARCH ARTICLE
Contents Vol 68(10)

Facile Synthesis of Hierarchical CuO Microspheres and their Gas Sensing Properties for NOx at Room Temperature

Wanzhen Song A , Hongyuan Wu A , Jingchao Wang A , Yufei Lin A , Jiabao Song A , Yu Xie B , Li Li A C D and Keying Shi A D
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University,Harbin 150080, China.

B Department of Materials Chemistry, Nanchang Hangkong University,Nanchang 330063, China.

C Key Laboratory of Chemical Engineering Process and Technology for High-Efficiency Conversion, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.

D Corresponding authors. Email: llwjjhlju@sina.cn; shikeying2008@163.com

Australian Journal of Chemistry 68(10) 1569-1576 https://doi.org/10.1071/CH15126
Submitted: 14 March 2015  Accepted: 23 April 2015   Published: 4 June 2015

Abstract

In this research, hierarchical CuO microspheres have been successfully synthesised by a facile reflux method. Scanning electron microscopy results clearly revealed that the hierarchical CuO microspheres were composed of two-dimensional nanosheets. The morphology of the prepared products could be tailored by changing the precursor concentration. The CuO-2 sample shows a higher NOx gas sensing performance with a low detection limit of 0.97 ppm, high gas response of 64.93 %, and short response time of 5.33 s to 97.0 ppm NOx at room temperature. The CuO-2 sensor also presents good selectivity and stability. The significantly improved gas response was concluded to be related to the well aligned microstructures and the improved conductivity of the CuO-2 sample. The unique hierarchical structure allows effective and rapid gas diffusion towards the sensing surfaces. In addition, the sensing mechanism based on the hierarchical CuO microspheres is discussed.


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