Pal, B. N. ; Basu, S. ; Chakravorty, D. (2005) Humidity sensing by fractally grown nanocomposites Journal of Applied Physics, 97 (3). 034311_1-034311_4. ISSN 0021-8979
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Official URL: http://link.aip.org/link/?JAPIAU/97/034311/1
Related URL: http://dx.doi.org/10.1063/1.1845601
Abstract
Fractal structure of α-iron was grown within gel-derived silica films. These were subjected to oxidation treatments at a temperature of 400 K for durations varying from 1 to 4 h. Nanoshells of Fe3O4 up to a thickness of 2 nm were formed in the process. The electrical resistivity of these nanocomposites was shown to arise due to a small polaron hopping mechanism between Fe2+ and Fe3+ sites. The nanocomposite films exhibited about three to four orders-of-magnitude resistivity change for an increase of relative humidity from 35% to 95%. The decrease was found to be exponential in nature and is believed to arise due to the injection of electrons to the oxide nanoshell.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Silicon Compounds; Iron Compounds; Nanocomposites; Humidity Sensors; Hygrometers; Humidity Measurement; Oxidation; Particle Size; Surface Resistance; Electrical Resistivity; Hopping Conduction; Thin Films |
| ID Code: | 65052 |
| Deposited On: | 15 Oct 2011 12:18 |
| Last Modified: | 15 Oct 2011 12:18 |
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