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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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.
|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
|Deposited On:||27 May 2009 10:23|
|Last Modified:||27 May 2009 10:23|
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