Gas Sensing Properties of In2O3 and In2O3: Ag Nanoparticle Layers
Structural, Optical and Gas Sensing Properties of In2O3 and In2O3: Ag Composite Nanoparticle Layers
978-3-8383-6540-4
3838365402
184
2010-06-10
68.00 €
eng
https://images.our-assets.com/cover/230x230/9783838365404.jpg
https://images.our-assets.com/fullcover/230x230/9783838365404.jpg
https://images.our-assets.com/cover/2000x/9783838365404.jpg
https://images.our-assets.com/fullcover/2000x/9783838365404.jpg
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 the space-charge layer. Gas sensing response thus depends on the change in depletion layer in interface from Ag2O-In2O3 to accumulation layer in Ag-In2O3.
https://www.morebooks.de/books/gb/published_by/lap-lambert-academic-publishing/47/products
Physics, astronomy
https://www.morebooks.de/store/gb/book/gas-sensing-properties-of-in2o3-and-in2o3:-ag-nanoparticle-layers/isbn/978-3-8383-6540-4