Nanoscale coatings of AuAl<inf>x</inf>and PtAl<inf>x</inf>and their mesoporous elemental derivatives

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Journal Article
Current Applied Physics, 2006, 6 (3), pp. 440 - 443
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A method to produce nanoscale films of AuAlxand PtAlx, and their mesoporous elemental derivatives is described, and the morphology and optical properties of these coatings explored. The color of the AuAlxfilm is bright purple, in agreement with ab initio calculations and experimental observations for the compound AuAl2, but becomes black after de-alloying with NaOH. The film of PtAlxis silver-grey and changes to grey after being converted to mesoporous Pt by de-alloying. Both mesoporous coatings exhibit a very rough surface, with pores of between 2 and 20 nm in diameter, and display a significantly more absorptive optical characteristic compared to their ordinary elemental counterparts. © 2005 Elsevier B.V. All rights reserved.
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