Synthesis of triangular Au core-Ag shell nanoparticles

Akhilesh Rai, Minakshi Chaudhary, Absar Ahmad, Suresh Bhargava, Murali Sastry

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In this paper, we demonstrate a simple and reproducible method for the synthesis of triangular Au core-Ag shell nanoparticles. The triangular gold core is obtained by the reduction of gold ions by lemongrass extract. Utilizing the negative charge on the gold nanotriangles, silver ions are bound to their surface and thereafter reduced by ascorbic acid under alkaline conditions. The thickness of the silver shell may be modulated by varying the pH of the reaction medium. The formation of the Au core-Ag shell triangular nanostructures has been followed by UV-vis-NIR Spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy (TEM) and atomic force microscopy (AFM) measurements. The sharp vertices of the triangles coupled with the core-shell structure is expected to have potential for application in surface enhanced Raman spectroscopy and in the sensitive detection of biomolecules.

Original languageEnglish
Pages (from-to)1212-1220
Number of pages9
JournalMaterials Research Bulletin
Issue number7
Publication statusPublished - 3 Jul 2007


  • A. Metals
  • B. Chemical synthesis
  • C. Atomic force microscopy
  • C. Photoelectron spectroscopy

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