Abstract
It is shown that scanning-probe and optical measurements performed on individual gold particles provide direct experimental evidence on the inhomogeneous ligand distribution of tip-selectively cysteamine-modified gold nanorods. At higher (10–2 mM) cysteamine concentration, a well-defined patch is formed at the tips of 115 × 55 nm gold nanorods. While at lower cysteamine concentration binding of the cysteamine still takes place at the rod tips, it only provides a partial coverage, allowing other thiol molecules to bind at the rod tip. The findings allow for a more rational design of functional patchiness at the nanoparticle level.
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