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

222 Citations (Scopus)

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 HAuCl<inf>4</inf>. 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

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Surface Properties
Reducing Agents
Chemical stability
Reducing agents
Surface properties
Atoms
acid gold tetrachloride

ASJC Scopus subject areas

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

Cite this

Galvanic replacement-free deposition of au on ag for core-shell nanocubes with enhanced chemical stability and SERS activity. / Yang, Yin; Liu, Jingyue; Fu, Zheng Wen; Qin, Dong.

In: Journal of the American Chemical Society, Vol. 136, No. 23, 11.06.2014, p. 8153-8156.

Research output: Contribution to journalArticle

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