A comparative study of gold nanocubes, octahedra, and rhombic dodecahedra as highly sensitive SERS substrates

Hsin Lun Wu, Huei Ru Tsai, Yun Ting Hung, Ka Un Lao, Ching Wen Liao, Pei Ju Chung, Jer Shing Huang, I. Chia Chen, Michael H. Huang

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

Gold nanocubes, octahedra, and rhombic dodecahedra with roughly two sets of particle sizes have been successfully synthesized via a seed-mediated growth approach. All six samples were analyzed for comparative surface-enhanced Raman scattering (SERS) activity. All of these Au nanostructures were found to yield strong enhancement at a thiophenol concentration of 10-7 M and are excellent SERS substrates. Rhombic dodecahedra with a rhombus edge length of 32 nm showed significantly better enhancement than the other samples and can reach a detection limit of 10-8 M. Simulations of the binding energies of thiophenol on the different faces of gold and electric near-field intensities of these nanocrystals have been performed to evaluate the experimental results. Superior SERS activity of these nanocrystals can be expected toward the detection of many other molecules.

Original languageEnglish
Pages (from-to)8106-8111
Number of pages6
JournalInorganic Chemistry
Volume50
Issue number17
DOIs
Publication statusPublished - 2011 Sep 5

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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