Issue 93, 2015

pH-induced recovery and redispersion of shape-controlled gold nanorods for nanocatalysis

Abstract

The amphiphilic, pH-responsive amine derivative, 3-[(2-carboxy-ethyl)-hexadecyl-amino]-propionic acid (C16CA) was used for the functionalization of gold nanorods (Au NRs) prepared with cetyltrimethylammonium bromide (CTAB). The Au NRs could also be stabilized with C16CA owing to the selective adsorption of the amino moiety, and the Au NRs were well dispersed following one-step ligand exchange using C16CA. Based on a change in the nature of C16CA, self-assemblies of spherical micelles (pH > 5) or lamellar precipitates (pH 2–5) are formed in dispersion. Au NRs were incorporated into the precipitates at pH 2–5, but could be redispersed by redissolution of C16CA at pH > 5. The pH-induced recovery–redispersion of Au NRs was successfully accomplished without affecting the morphology of the Au NRs, the amount of Au in the dispersion, or the catalytic activity of the Au NRs for the reduction of p-nitrophenol.

Graphical abstract: pH-induced recovery and redispersion of shape-controlled gold nanorods for nanocatalysis

Supplementary files

Article information

Article type
Paper
Submitted
27 Aug 2015
Accepted
02 Sep 2015
First published
02 Sep 2015

RSC Adv., 2015,5, 75889-75894

Author version available

pH-induced recovery and redispersion of shape-controlled gold nanorods for nanocatalysis

C. Morita-Imura, T. Kobayashi, Y. Imura, T. Kawai and H. Shindo, RSC Adv., 2015, 5, 75889 DOI: 10.1039/C5RA17369H

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