Raghu, S. and Sheela, B. and Phani, K.L.N. and Yegnaraman, V. (2005) Nanoparticulate platinum films on gold using dendrimer-based wet chemical method. Pramana-Journal of Physics, 65 (5). pp. 821-830. ISSN 0304-4289

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Abstract

There is a growing interest in devising wet chemical alternatives for physical deposition methods for applications involving thin ¯lms, e.g., catalysis. Deposition of platinum on thin gold ¯lms is often a problem leading to incomplete coverage and improper adhesion to solid surfaces. Gold substrates often need pre-activation for achieving complete coverage. We demonstrate here that dendrimers with proper functionalities and size work as well-de¯ned nucleating agents and adhesion promoters. This feature is demonstrated using an amine-terminated dendrimer of generation 4.0. This approach allows one to obtain adherent nanoparticulate ¯lms of platinum on gold. Unlike other nucleating agents and adhesion promoting compounds, dendrimers have a well-de¯ned ordered structure in terms of their space ¯lling ability. The stability of the ¯lms obtained with adsorbed dendrimers is demonstrated using the electrocatalytic reactions of fuels like methanol. The ¯lms formed without dendrimers cannot sustain the electro-oxidation currents due to the instability of the ¯lms while the ¯lms formed with dendrimers can sustain currents for longer duration and for several cycles. The dendrimer-derived Pt ¯lms exhibit higher catalytic activity compared to other methods.

Item Type:	Article
Uncontrolled Keywords:	Nanoparticulate films; platinum; electrocatalysis; adhesion promoters; PAMAM dendrimers.
Subjects:	Electrodics and Electrocatalysis Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	18 Jan 2012 03:54
Last Modified:	18 Jan 2012 03:54
URI:	http://cecri.csircentral.net/id/eprint/170

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