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Fabrication of Metal@SnO2 Core-Shell Nanocomposites for Gas Sensing Applications
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Author(s): Sanjay K. Suar (KIIT University, India), Sayantan Sinha (KIIT University, India), Amrita Mishra (KIIT University, India)and Suraj K. Tripathy (KIIT University, India)
Copyright: 2015
Pages: 14
Source title:
Handbook of Research on Diverse Applications of Nanotechnology in Biomedicine, Chemistry, and Engineering
Source Author(s)/Editor(s): Shivani Soni (Alabama State University, USA), Amandeep Salhotra (City of Hope National Medical Center, USA)and Mrutyunjay Suar (KIIT University, India)
DOI: 10.4018/978-1-4666-6363-3.ch020
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Abstract
Metal/SnO2 is one of the most popular composite systems because of its application in gas sensors, where the metal in contact with the SnO2 (semiconductor) enhances sensor performance in terms of sensitivity, response, and recovery time. This is because the metal acts as an electron reservoir, improving the depletion layer formation by interfacial charge-transfer process and delaying the electrons-holes recombination process in SnO2. Conventionally, the metal nanoparticles are anchored on the surface of SnO2 to produce hetero-interfaces. Despite effective catalytic activity, this structural drawback exposes metals to other chemical species. Therefore, it is necessary to design new strategies to improve the chemical and thermal stability of metal/SnO2. Recently, nanocomposites with metal core and SnO2 shell became potential candidates due to their chemical and thermal stability and superior material property. In this chapter, fabrication of metal@SnO2 core-shell nanocomposites are discussed as a potential gas sensing material.
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