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| Title: | Electrode-sample capacitance effect on Ethanol sensitivity of nano-grained SnO2 thin films |
| Authors: | Varghese, Oomman K
Malhotra, L K |
| Keywords: | Sensitivity
Ethanol
Nano-crystalline
Contact capacitance |
| Issue Date: | 1998 |
| Citation: | Sensors and Actuators B, 53(1-2), 19–23 |
| Abstract: | Tin oxide thin films were deposited on float glass, Corning 7059 glass and alumina substrates by sol-gel technique using
SnCl2 · 2H2O as a precursor. The average crystallite size, determined by X-ray diffraction (XRD) was 4.5 nm for films on float glass and 9.0 nm for films on Corning and alumina substrates. Atomic force microscope (AFM) studies confirmed the
nano-grained structure of the films. It was observed that the samples retain some charge after switching off the 9V dc bias applied to them for sensitivity measurements. This charge was found to decay with time. The amount of charging was considerably low if the samples were kept in a vacuum 10-2 Pa or at temperatures B573 K. Exposure of the samples to ethanol vapour
eliminates the charging effect. The effect was found to be prominent in films on float glass substrates and very small in films on
Corning and alumina substrates. The films on float glass showed an extremely high sensitivity (240 for 700 ppm of ethanol) to
ethano... |
| URI: | http://eprint.iitd.ac.in/dspace/handle/2074/647 |
| Appears in Collections: | Physics
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| vargheseele1998.pdf | | 601Kb | Adobe PDF | View/Open |
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