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Enhanced gas sensing properties of In2O3:Ag composite nanoparticle layers; electronic interaction, size and surface induced effects

Singh, Vidya N. and Mehta, Bodh R. and Joshi, Rakesh K. and Kruis, Frank E. and Shivaprasad, Sonnada M. (2007) Enhanced gas sensing properties of In2O3:Ag composite nanoparticle layers; electronic interaction, size and surface induced effects. Sensors and Actuators B: Chemical, 125 (2). 482-488 .

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleUR...

Abstract

For investigating the role of metal additives in enhancing the gas sensing response of an oxide semiconductor material, In2O3:Ag composite nanoparticle layers having well-defined individual (In2O3 and Ag) nanoparticle sizes and composition have been grown by a dip coating method using chemically grown nanoparticles as precursors. X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) have been used to characterize the composite nanoparticle layers. Gas sensing properties of the In2O3:Ag layers have been investigated as a function of Ag composition and ethanol concentration. The In2O3:Ag composite nanoparticle layer with 15% silver shows a higher sensor response of 436 and a short response time of 6 s to 1000 ppm ethanol at 400 °C, in comparison to an In2O3 nanoparticle layer. The proposed energy level diagram for the In2O3:Ag2O and In2O3:Ag interface explains the enhanced gas sensing response of the composite nanoparticle samples.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:5053
Deposited By:JNCASR
Deposited On:27 May 2009 10:23
Last Modified:27 May 2009 10:23

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