Synthesis of hex nut shaped Au-Ag nanostructures via a galvanic replacement reaction and their optical properties

Mun Ho Kim, Jong Jin Lee, Sang Hyuk Im, Doo Jin Byun, Kil Yeong Choi

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8 Citations (Scopus)


Galvanic replacement reactions have been successfully employed to produce hollow bimetallic nanostructures with a range of shapes. This paper presents a systematic study of the galvanic replacement reaction between 122 nm thick hexagonal Ag nanoplates and HAuCl4 in an aqueous medium. We monitored the morphological and spectral changes as a function of the HAuCl 4-to-Ag molar ratio. The replacement reaction on the hexagonal Ag nanoplates resulted in the formation of a series of porous Au-Ag nanostructures with a hex nut shape. The size and density of the pores could be controlled by varying the molar ratio of HAuCl4-to-Ag molar ratio. The localized surface plasmon resonance (LSPR) peaks of these nanostructures were readily tuned from 494 nm to 1044 nm as the porosity of the product was increased.

Original languageEnglish
Pages (from-to)6335-6339
Number of pages5
Issue number32
Publication statusPublished - 2013 Aug 19


ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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