Jump to main content
Jump to site search


Facile fabrication of cobalt-doped SnO2 for gaseous ethanol detection and the catalytic mechanism of cobalt

Author affiliations

Abstract

Semiconductors are widely used as basic materials in commercial ethanol detection sensors. In this work, SnO2 sensors were modified by a Co doping method to obtain Co-SnO2 for gaseous ethanol detection. For investigating the best sensing performance and elucidating the underlying catalytic mechanism, the effects of the Co/Sn feed ratio and calcination temperature during sample preparation were examined. The sample with a Co/Sn feed molar ratio of 1.0 calcined at 500 °C (D3-Co-SnO2) possessed better ethanol sensitivity than other samples. The best response to 100 ppm gaseous ethanol (i.e., ratio of sensor resistance in air to that in ethanol) was 105.2 at an operating temperature of 350 °C. More importantly, D3-Co-SnO2 achieved a low detection limit of 1 ppm and apparently higher selectivity over various gases (e.g., acetone, hydrogen, methane, etc.). The enhanced sensing performance was attributed to (1) the incorporation of Co atoms, which increased the number of oxygen vacancies and active sites; (2) the catalytic activity of Co(III) and Co(II), which changed the reaction process; and (3) the suitable pore size, which led to effective diffusion of the gas molecules.

Graphical abstract: Facile fabrication of cobalt-doped SnO2 for gaseous ethanol detection and the catalytic mechanism of cobalt

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Sep 2019, accepted on 04 Nov 2019 and first published on 04 Nov 2019


Article type: Paper
DOI: 10.1039/C9CE01530B
CrystEngComm, 2019, Advance Article

  •   Request permissions

    Facile fabrication of cobalt-doped SnO2 for gaseous ethanol detection and the catalytic mechanism of cobalt

    X. Zhang, B. Liu, Y. Xu, H. Liu, W. Zhao, P. Wang, A. Ming and F. Wei, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE01530B

Search articles by author

Spotlight

Advertisements