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

    15 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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