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Sensors 2011, 11(11), 10603-10614; doi:10.3390/s111110603

Article

Design of Selective Gas Sensors Using Additive-Loaded In₂O₃ Hollow Spheres Prepared by Combinatorial Hydrothermal Reactions

Sun-Jung Kim ¹ , In-Sung Hwang ¹ , Yun Chan Kang ²  and Jong-Heun Lee ^1,*

¹ Department of Materials Science and Engineering, Korea University, Seoul 136 713, Korea ² Department of Chemical Engineering, Konkuk University, Seoul 143-701, Korea

* Author to whom correspondence should be addressed.

Received: 16 September 2011; in revised form: 31 October 2011 / Accepted: 4 November 2011 / Published: 7 November 2011

(This article belongs to the Special Issue Sensing at the Nano-Scale: Chemical and Bio-Sensing)

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Abstract: A combinatorial hydrothermal reaction has been used to prepare pure and additive (Sb, Cu, Nb, Pd, and Ni)-loaded In₂O₃ hollow spheres for gas sensor applications. The operation of Pd- and Cu-loaded In₂O₃ sensors at 371 °C leads to selective H₂S detection. Selective detection of CO and NH₃ was achieved by the Ni-In₂O₃ sensor at sensing temperatures of 371 and 440 °C, respectively. The gas responses of six different sensors to NH₃, H₂S, H₂, CO and CH₄ produced unique gas sensing patterns that can be used for the artificial recognition of these gases.

Keywords: gas sensor; In₂O₃ hollow spheres; combinatorial method; selective detection; pattern recognition

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