Serial silver clusters biomineralized by one peptide

Yanyan Cui, Yaling Wang, Ru Liu, Zhipeng Sun, Yueteng Wei, Yuliang Zhao, Xueyun Gao

Research output: Contribution to journalArticle

118 Scopus citations

Abstract

The artificial peptide with amino acid sequence CCYRGRKKRRQRRR was used to biomineralize serial Ag clusters. Under different alkaline conditions, clusters with red and blue emission were biomineralized by the peptide, respectively. The matrix-assisted laser desorption/ionization time-of-flight mass spectra implied that the red-emitting cluster sample was composed of Ag28, while the blue-emitting cluster sample was composed of Ag5, Ag6, and Ag7. The UV-visible absorption and infrared spectra revealed that the peptide phenol moiety reduced Ag+ ions and that formed Ag clusters were captured by peptide thiol moieties. The phenol reduction potential was controlled by the alkalinity and played an important role in determining the Ag cluster size. Circular dichroism observations suggested that the alkalinity tuned the peptide secondary structure, which may also affect the Ag cluster size.

Original languageEnglish (US)
Pages (from-to)8684-8689
Number of pages6
JournalACS Nano
Volume5
Issue number11
DOIs
StatePublished - Nov 22 2011

Keywords

  • biomineralization
  • peptide
  • reduction potential
  • secondary structure
  • silver cluster

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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