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Electrochemical deposition of polypyrrole nanolayers on discontinuous ultrathin gold films

Mtsuko, D and Avnon, A and Lievonen, J and Ahlskog, M and Menon, Rajalakshmi K (2008) Electrochemical deposition of polypyrrole nanolayers on discontinuous ultrathin gold films. In: Nanotechnology, 19 (12). 125304-1-125304-6.


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Official URL: http://www.iop.org/EJ/article/0957-4484/19/12/1253...


Ultrathin layers of polypyrrole (PPy) were electrochemically grown between microelectrodes on a $Si/SiO_2$ substrate. Conducting nanolayers of PPy are directly grown onto ultrathin discontinuous gold (Au) film between the microelectrodes, with thicknesses in the range 10–100 nm. The system therefore forms a novel (PPy/Au) nanocomposite conductor. Atomic force microscopy (AFM) imaging and conductivity measurements indicate that at all thicknesses a relatively uniform film is formed but with significant roughness that reflects the roughness of the metallic island layer. In PPy/Au films with thickness $\sim 10 nm$, the small barriers around the gold islands dominate the conduction, and as the film thickness increases to 100 nm the intrinsic conductivity of highly doped PPy dominates the charge transport.

Item Type: Journal Article
Publication: Nanotechnology
Publisher: Institute of Physics
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Sep 2008 11:31
Last Modified: 19 Sep 2010 04:49
URI: http://eprints.iisc.ac.in/id/eprint/15911

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