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Sensors 2015, 15(12), 29950-29957; doi:10.3390/s151229775

A Single Eu-Doped In2O3 Nanobelt Device for Selective H2S Detection

Institute of Physics and Electronic Information Technology, Yunnan Normal University, Kunming 650500, China
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Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 3 October 2015 / Revised: 25 November 2015 / Accepted: 26 November 2015 / Published: 30 November 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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Abstract

Eu-doped In2O3 nanobelts (Eu-In2O3 NBs) and pure In2O3 nanobelts (In2O3 NBs) are synthesized by the carbon thermal reduction method. Single nanobelt sensors are fabricated via an ion beam deposition system with a mesh-grid mask. The gas-sensing response properties of the Eu-In2O3 NB device and its undoped counterpart are investigated with several kinds of gases (including H2S, CO, NO2, HCHO, and C2H5OH) at different concentrations and different temperatures. It is found that the response of the Eu-In2O3 NB device to 100 ppm of H2S is the best among these gases and the sensitivity reaches 5.74, which is five times that of pure In2O3 NB at 260 °C. We also found that the former has an excellent sensitive response and great selectivity to H2S compared to the latter. Besides, there is a linear relationship between the response and H2S concentration when its concentration changes from 5 to 100 ppm and from 100 to 1000 ppm. The response/recovery time is quite short and remains stable with an increase of H2S concentration. These results mean that the doping of Eu can improve the gas-sensing performance of In2O3 NB effectually. View Full-Text
Keywords: Eu-doped In2O3; single nanobelt; gas sensor; H2S Eu-doped In2O3; single nanobelt; gas sensor; H2S
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

Chen, W.; Liu, Y.; Qin, Z.; Wu, Y.; Li, S.; Ai, P. A Single Eu-Doped In2O3 Nanobelt Device for Selective H2S Detection. Sensors 2015, 15, 29950-29957.

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