Chemical Kinetics of Gold Nanorod Growth in Aqueous CTAB Solutions

Craig Bullen, Peter Zijlstra, Eric Bakker, Min Gu, Colin Raston

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    The chemical kinetics of the silver-mediated growth of gold nanorods prepared by the reduction of gold precursor in aqueous cetyltrimethylammonium bromide (CTAB) solution has been systematically studied using spectroscopic monitoring and electron microscopy. The rate of monomer depletion -d[Au n+]/dt has a linear dependence on both [Aun+] and seed nuclei concentration at 30 °C. Particle growth is significantly retarded by hexadecyltrimethylammonium bromide (CTAB) and KBr, with the order ca. -1 for [Br-]. The rate of nanoparticle growth is dependent on the reducing ascorbate monoanion concentration and is consequently highly pH dependent around the pKa 1 of ascorbic acid, while AgNO3 retards the observed kinetics for both the growth of nanorods from ca. 2 nm seed nuclei and the overgrowth of Au nanorods.

    Original languageEnglish
    Pages (from-to)3375-3380
    Number of pages6
    JournalCrystal Growth and Design
    Volume11
    Issue number8
    DOIs
    Publication statusPublished - 3 Aug 2011

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