Synthesis of triangular Au core-Ag shell nanoparticles

Journal Article · Tue Jul 03 04:00:00 EDT 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.10.019· OSTI ID:21000660

Rai, Akhilesh ^[1]; Chaudhary, Minakshi ^[1]; Ahmad, Absar ^[2]; Bhargava, Suresh ^[3]; Sastry, Murali ^[4]

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1. Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune 411008 (India)
2. Biochemical Science Division, National Chemical Laboratory, Pune 411008 (India)
3. Department of Applied Chemistry, RMIT University, Melbourne, Victoria 3001 (Australia)
4. Tata Chemicals Limited, Anmol Pride, Baner Road, Pune 410045 (India)

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.

• OSTI ID: 21000660
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ASCORBIC ACID
ATOMIC FORCE MICROSCOPY
CHEMICAL PREPARATION
GOLD
GOLD IONS
NANOSTRUCTURES
PH VALUE
RAMAN SPECTROSCOPY
SILVER IONS
SYNTHESIS
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY PHOTOELECTRON SPECTROSCOPY