| Autor: |
Pal, B. N., Basu, S., Chakravorty, D. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2/1/2005, Vol. 97 Issue 3, p034311, 4p, 5 Black and White Photographs, 4 Charts, 3 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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