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Addendum published on 5 April 2017, see Sensors 2017, 17(4), 768.

Open AccessArticle
Sensors 2016, 16(9), 1373; doi:10.3390/s16091373

Hybrid SnO2/TiO2 Nanocomposites for Selective Detection of Ultra-Low Hydrogen Sulfide Concentrations in Complex Backgrounds

1
VAON LLC, KY, USA, Bowling Green, KY 42101, USA
3
Applied Physics Institute, Western Kentucky University, Bowling Green, KY 42101, USA
2
Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, USA
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 16 July 2016 / Revised: 17 August 2016 / Accepted: 19 August 2016 / Published: 27 August 2016
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [5132 KB, uploaded 18 April 2017]   |  

Abstract

In this paper, we present a chemiresistive metal oxide (MOX) sensor for detection of hydrogen sulfide. Compared to the previous reports, the overall sensor performance was improved in multiple characteristics, including: sensitivity, selectivity, stability, activation time, response time, recovery time, and activation temperature. The superior sensor performance was attributed to the utilization of hybrid SnO2/TiO2 oxides as interactive catalytic layers deposited using a magnetron radio frequency (RF) sputtering technique. The unique advantage of the RF sputtering for sensor fabrication is the ability to create ultra-thin films with precise control of geometry, morphology and chemical composition of the product of synthesis. Chemiresistive films down to several nanometers can be fabricated as sensing elements. The RF sputtering technique was found to be very robust for bilayer and multilayer oxide structure fabrication. The geometry, morphology, chemical composition and electronic structure of interactive layers were evaluated in relation to their gas sensing performance, using scanning electron microscopy (SEM), X-ray diffraction technique (XRD), atomic force microscopy (AFM), Energy Dispersive X-ray Spectroscopy (EDAX), UV visible spectroscopy, and Kelvin probe measurements. A sensor based on multilayer SnO2/TiO2 catalytic layer with 10% vol. content of TiO2 demonstrated the best gas sensing performance in all characteristics. Based on the pattern relating material’s characteristics to gas sensing performance, the optimization strategy for hydrogen sulfide sensor fabrication was suggested. View Full-Text
Keywords: sensor; micro-electromechanical systems (MEMS); hydrogen sulfide; nanocomposites sensor; micro-electromechanical systems (MEMS); hydrogen sulfide; nanocomposites
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Larin, A.; Womble, P.C.; Dobrokhotov, V. Hybrid SnO2/TiO2 Nanocomposites for Selective Detection of Ultra-Low Hydrogen Sulfide Concentrations in Complex Backgrounds. Sensors 2016, 16, 1373.

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