Asymmetric Dimers Can Be Formed by Dewetting Half-Shells of Gold Deposited on the Surfaces of Spherical Oxide Colloids

Yu Lu, Hui Xiong, Xuchuan Jiang, Younan Xia, Mara Prentiss, George M. Whitesides

Research output: Contribution to journalArticlepeer-review

209 Scopus citations

Abstract

Asymmetric dimers consisting of gold microcrystals and spherical silica colloids have been fabricated by depositing thin films of gold onto the spherical colloids to form half-shells, followed by annealing at elevated temperatures. The capability and feasibility of this procedure have been demonstrated with silica and titania beads of 0.2-2 μm in diameter and γ-Fe2O3/polystyrene@SiO2 core-shell particles 0.5 μm in size. The dimensions of gold microcrystals could be conveniently varied in the range of 100-650 nm by controlling the thickness of gold films and/or the diameter of the spherical colloids. This method provides another route to asymmetric dimers made of colloidal particles that could be different in size, chemical composition, surface functionality, density or sign of surface charge, bulk property, or a combination of these properties.

Original languageEnglish
Pages (from-to)12724-12725
Number of pages2
JournalJournal of the American Chemical Society
Volume125
Issue number42
DOIs
StatePublished - 22 Oct 2003

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