Issue 45, 2017
From the journal:

RSC Advances

Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

Jie Hu, ORCID logo *a   Yongjiao Sun,a   Xiu Wang,a   Lin Chen,*b   Wengdong Zhanga  and  Yong Chenc  

* Corresponding authors

a Micro and Nano System Research Center, Key Lab of Advanced Transducers and Intelligent Control System (Ministry of Education), College of Information Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
E-mail: hujie@tyut.edu.cn

b Research Center on Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

c Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités – UPMC Univ Paris 06, CNRS UMR 8640 PASTEUR, 24, rue Lhomond, 75005 Paris, France

Abstract

Flower-like molybdenum oxide@tungsten oxide (MoO3@WO3) composite microstructures were successfully synthesized by hydrothermal and impregnation methods. The fabricated samples were characterized by XRD, EDS, SEM and TEM, and the results show that the MoO3@WO3 composite is composed of crystallized nanosheets with a thickness of about 40 nm. The gas sensing properties of the MoO3@WO3 composite microstructures towards hydrogen sulfide (H2S) were investigated as a function of operating temperature and gas concentration. The gas sensors based on MoO3@WO3 composites show better sensing performances than that of a pure one. Moreover, the Mo6W-based gas sensor exhibits the highest response (28.5 towards 10 ppm H2S), fast response/recovery time (2 s/5 s), low detection limit (20 ppb) and good selectivity at optimum operating temperature (250 °C). Such an excellent performance can be attributed to the heterojunction between MoO3 and WO3.

Graphical abstract: Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

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Article information

DOI
https://doi.org/10.1039/C7RA03864J
Article type
Paper
Submitted
05 Apr 2017
Accepted
22 May 2017
First published
30 May 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 28542-28547

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Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

J. Hu, Y. Sun, X. Wang, L. Chen, W. Zhang and Y. Chen, RSC Adv., 2017, 7, 28542 DOI: 10.1039/C7RA03864J

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