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Title: Synthesis, characterization and CO<sub>2</sub> gas sensing response of SnO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> double layer sensor
Authors: Waghuley, S A
Keywords: SnO<sub>2</sub>
Screen-printing technique
CO<sub>2</sub> gas
Double layer sensor
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
Abstract: Tin dioxide (SnO<sub>2</sub>) material changes its properties depending on the ambient gas which can be utilized as gas sensing materials. Usually changes in electrical resistance/conductance in response to environmental gases are monitored. SnO<sub>2</sub> and double layer (SnO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>) sensors have been prepared by screen-printing technique on glass substrate. The sensors were used for different concentration (ppm) of CO<sub>2</sub> gas investigation at different temperature. The sensing response (sensitivity) of SnO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> double layer sensor was found to be higher, compared with pure SnO<sub>2</sub> sensor. The average grain size of SnO<sub>2</sub> was determined from XRD pattern and found to be 120.7 nm. The activation energy (<i style="">E</i><sub>a</sub>) of first order reaction (<i style="">n</i> =1) for SnO<sub>2</sub> has been found to be 72.06 kJ/g-mol from endo DDTA and 325.95 kJ/g-mol from exo DDTA. The microstructure of SnO<sub>2</sub> has been studied from SEM analysis. The oxygen ions adsorb onto the surface of material removes electrons from the bulk and create a potential barrier that limits electron movement and resistivity. When exposed to an oxidizing gas such as CO<sub>2</sub> then it is chemisorbed on bridging oxygen atoms with the formation of a surface carbonate, subsequently increasing the barrier height and resistivity.
Description: 816-819
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(12) [December 2011]

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