Gas Sensing Properties of In2O3 and In2O3: Ag Nanoparticle Layers - Singh, Vidya Nand;Mehta, B. R.
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Gas-sensing properties of oxide semiconductors improves by using then in nanocrystalline forms. The sensitivity of gas-sensor has also been modified by adding metals or metal oxides as catalytic agents. Using the In2O3 and Ag nanoparticles as the precursor; In2O3: Ag composite nanoparticle layers have been grown. It has been demonstrated that a decreasing particle size leads to an increased sensitivity and a decreased response time. At C2H5OH concentration of 1000 ppm in air and at an operating temperature of 400°C, sensitivity and response time of 325 and 8 s, respectively have been achieved…mehr

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Produktbeschreibung
Gas-sensing properties of oxide semiconductors improves by using then in nanocrystalline forms. The sensitivity of gas-sensor has also been modified by adding metals or metal oxides as catalytic agents. Using the In2O3 and Ag nanoparticles as the precursor; In2O3: Ag composite nanoparticle layers have been grown. It has been demonstrated that a decreasing particle size leads to an increased sensitivity and a decreased response time. At C2H5OH concentration of 1000 ppm in air and at an operating temperature of 400°C, sensitivity and response time of 325 and 8 s, respectively have been achieved in case of In2O3 nanoparticles with a size of 14 nm. With the addition of 15% silver, response time of 6 s and sensitivity of 436 has been obtained for 1000 ppm ethanol at 400°C. Ag2O nanoparticle draws electrons from the In2O3 layer and enhances the formation of electron-depleted layer. On exposure to a reducing gas, interfacial Ag2O is reduced to Ag, with a decrease or disappearance of thespace-charge layer. Gas sensing response thus depends on the change in depletion layer in interface from Ag2O-In2O3 to accumulation layer in Ag-In2O3.
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Autorenporträt
Dr. V.N. Singh, a senior scientist at IITD earned his MSc from BHU, MTech and PhD in Physics from IIT Delhi. His research interests are synthesis of nanostructures for gas sensing and solar cell applications. Prof. B. R. Mehta is a Professor at IITD. His research interests are nanostructured solar cells, sensing and switching devices