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Systematic Control of Size and Morphology in the Synthesis of Gold Nanoparticles

P. Abdulkin,Thea-Luise Precht,B. Knappett,Helen E. Skelton,D. Jefferson,A. Wheatley

Published 2014 in Particle & Particle Systems Characterization

ABSTRACT

The synthesis of gold nanoparticles (Au NPs) capped by poly(1‐vinylpyrrolidin‐2‐one (PVP, average M¯w = 10 000 kDa) yields moderately dispersed (6–8.5 nm) product with limited morphological control while larger NPs (15–20 nm) are reliably prepared using trisodium citrate (Na3Cit) as a reductant/capping agent. Excellent size control in the intermediate 10 nm regime is achieved by hybridizing these methodologies, with highly monodisperse, polycrystalline Au NPs forming. For a Na3Cit:PVP:Au ratio of 3.5:3.5:1, anisotropic NPs with an aspect ratio of 1.8:1 suggest the systematic agglomeration of NP pairs. Enhanced control of NP morphology is allowed by the 1,2‐tetradecanediol reduction of AuIII in the presence of straight chain, molecular anti‐agglomerants. Last, ligand substitution is used to controllably grow preformed Au seeds. In spite of the extended growth phase used, the replacement of phosphine by 1‐pentadecylamine affords highly monodisperse, cuboidal NPs containing a single clearly visible twinning plane. The allowance of particle growth parallel to this close‐packed plane explains the remarkable particle morphology.

PUBLICATION RECORD

  • Publication year

    2014

  • Venue

    Particle & Particle Systems Characterization

  • Publication date

    2014-05-01

  • Fields of study

    Materials Science, Chemistry

  • Identifiers
    DOI 10.1002/ppsc.201300227
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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