Surfactants-aided syntheses of different sizes And triangular shape of gold nanoparticles using trisodium citrate in environmentally friendly and photoinduced methods

Yen-Hsun Su, Wei Hao Lai, Shih-hui Chang, Min Hsiung Hon

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We prepared gold nanoparticles (Au NPs) by only using thsodium citrate as the stabilizer. The detailed reaction mechanisms of S N 1 and E1 reactions are examined and evidenced in this study by FTIR data. Citric acid is a kind of tertiary substrate. In aqueous solution, the substitution nucleophile path 1 (S N1) reaction and Elimination path 1 (E1) reaction usually occur simultaneously. Chloride ions, the substitution nucleophile, play a very important role to launch the mechanisms of S N 1 and E1 reactions. Controlling the concentration of the chloride ions with the addition of HCI (aq) according to Le Chatelier theory, the average particle size of Au NPs (5.5 nm) was achieved to overcome the minimum limited size (∼10 nm). Two stages of the photoinduced method, aggregation into triangular conglomerates and growth into triangular particles, were determined form TEM observations. This preparation of Au NPs has potential in tuning the size, shape, and mechanism of Au NP formation by using only environmentally friendly trisodium citrate and the photoinduced method.

Original languageEnglish
Pages (from-to)3146-3151
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number9
DOIs
Publication statusPublished - 2007 Sep

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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