Galvanic replacement-free deposition of au on ag for core-shell nanocubes with enhanced chemical stability and SERS activity

Yin Yang, Jingyue Liu, Zheng Wen Fu, Dong Qin

Research output: Contribution to journalArticle

259 Scopus citations

Abstract

We report a robust synthesis of Ag@Au core-shell nanocubes by directly depositing Au atoms on the surfaces of Ag nanocubes as conformal, ultrathin shells. Our success relies on the introduction of a strong reducing agent to compete with and thereby block the galvanic replacement between Ag and HAuCl4. An ultrathin Au shell of 0.6 nm thick was able to protect the Ag in the core in an oxidative environment. Significantly, the core-shell nanocubes exhibited surface plasmonic properties essentially identical to those of the original Ag nanocubes, while the SERS activity showed a 5.4-fold further enhancement owing to an improvement in chemical enhancement. The combination of excellent SERS activity and chemical stability may enable a variety of new applications.

Original languageEnglish (US)
Pages (from-to)8153-8156
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number23
DOIs
StatePublished - Jun 11 2014

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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