Effects of ammonium salts and anionic amphiphiles on the photochemical formation of gold nanorods

Yasuro Niidome, Koji Nishioka, Hideya Kawasaki, Sunao Yamada

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The effects of ammonium salts and anionic amphiphiles on the formation and morphology of gold nanorods (NRs) in hexadecyltrimethylammonium bromide (CTAB) solutions were investigated. The addition of a small amount of tetrahexylammonium bromide (THAB) increased the aspect ratio of NRs, while an excess of THAB or tetradodecylammonium bromide (TDAB) decreased the aspect ratio, and concomitantly increased the formation of spherical gold nanoparticles. In contrast, the addition of anionic amphiphiles forming hydrophobic ion-complexes with CTAB did not decrease the aspect ratio, but suppressed the formation of NRs. These results could be attributed to the change in the adsorbed layer of CTAB on the gold NRs.

Original languageEnglish
Pages (from-to)161-164
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume257-258
DOIs
Publication statusPublished - May 5 2005

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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