Room-temperature size evolution of thiol-protected gold nanoparticles assisted by proton acids and halogen anions

Masayuki Kanehara; Jun-ichi Sakurai; Hiroyuki Sugimura; Toshiharu Teranishi

doi:10.1021/ja8058167

Room-temperature size evolution of thiol-protected gold nanoparticles assisted by proton acids and halogen anions

J Am Chem Soc. 2009 Feb 11;131(5):1630-1. doi: 10.1021/ja8058167.

Authors

Masayuki Kanehara¹, Jun-ichi Sakurai, Hiroyuki Sugimura, Toshiharu Teranishi

Affiliation

¹ Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan.

PMID: 19143539
DOI: 10.1021/ja8058167

Abstract

In the present work, a mild size-control method for thiol-protected Au NPs was developed. When thiol-protected Au NPs were reacted with tetra-n-octylammonium bromide and trifluoroacetic acid, the size of Au NPs was tuned in the range from 2 to 6 nm at room temperature. Larger Au NPs could be obtained by mild heating at 55 degrees C. This size evolution method assisted by proton acid and bromide anion is a first example of the size tuning of thiol-protected Au NPs at room temperature. Because of the mild reactivity of acid and bromide ions to organic molecules, various thiol derivatives sensitive to heat, base, and reducing agent can be utilized for this method.