Sonochemical Synthesis of Well-Dispersed Gold Nanoparticles at the Ice Temperature

Chia Hao Su, Pei Lin Wu, Chen Sheng Yeh

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80 Citations (Scopus)

Abstract

A newly modified sonochemical approach was demonstrated to synthesize stable Au suspensions. The formation of Au nanoparticles with diameters of ∼20 nm was accomplished through the ultrasonic irradiation of aqueous HAuCl4 solutions containing trisodium citrate at 4 °C. The efficient generation in gold particles only occurred when the sufficient citrate concentrations (1.9, 2.9, and 3.9 mM) were reached. At low citrate concentrations ranging from 0.49 to 1.5 mM, large aggregates of coalesced Au particles were observed as sonication time increased. It is proposed that citrate could transform as the reducing radicals, 1,2,3-tricarboxy-2-propyl radicals, for the AuCl4- reduction and might also act as the stabilizer during particles formation.

Original languageEnglish
Pages (from-to)14240-14243
Number of pages4
JournalJournal of Physical Chemistry B
Volume107
Issue number51
DOIs
Publication statusPublished - 2003 Dec 25

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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