Resistance-time dependence and gauge factor of two-dimensional granular gold films deposited on “Melinex”
✍ Scribed by A. G. Bishay; A. M. Darwish; D. A. Abdelhady
- Book ID
- 104640842
- Publisher
- Springer US
- Year
- 1995
- Tongue
- English
- Weight
- 375 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0957-4522
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✦ Synopsis
Two-dimensional granular gold films (2D-G(Au)F) with different mass thicknesses were prepared by thermal evaporation in vacuum. The plastic substrate was polyethylene terephthalate, Melinex, held at ambient temperature during deposition. The dependence of the direct current (d.c.) resistance of the gold films on time was studied in air at a room temperature of 23 ~' C until the films attained reasonable short-term stability, that is, invariance of the resistance with time. The films showed this stability after a few hours, from the moment the deposition was halted, and this time is remarkably shorter than that reported in the literature for 2D-G(Au)F deposited on other substrates. The effect of strain ( ~ 10 -3) on the stable d.c. resistance of the 2D-G(Au)F was investigated and the gauge factor, v, was deduced for each mass thickness. Strains were induced in the stable films via the direct stretching of the Melinex substrate by the aid of a mechanical system which was specially designed for that purpose. The values of v for the films studied are comparable to those published for 2D-G(Au)F deposited on other substrates. Also, it was found that thinner gold films p£ssessed higher values of v than thicker films. The present experimental results can be interpreted by: (i) speculating that the electron transfer between gold islands took place via a quantum-mechanical tunnelling mechanism, and (ii) considering the dynamic island model.