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Advanced Materials

Synthesis and Optical Properties of Gold Nanodecahedra with Size Control

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  • This work has been supported by the Spanish Ministerio de Educación y Ciencia, through Grants No. MAT2003-02991 and NAN2004-08843-C05-03(05). Supporting Information is available online from Wiley InterScience or from the author.

Abstract

Regular gold nanodecahedra (pentagonal bipyramids) are obtained in high yield through ultrasound-induced reduction of HAuCl4 by dimethylformamide on presynthesized seeds (see figure). A dependence of the final morphology on the crystalline structure of the seeds is demonstrated by growing gold on single-crystal platinum nanoparticles, which yields uniform octahedra. Resolution of Maxwell's equations for bicones shows good agreement with experimental optical properties.

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