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Cysteine mediated assembly of gold nanoparticles

I. PETEAN1, GH. TOMOAIA2, O. HOROVITZ1, A. MOCANU1, M. TOMOAIA-COTISEL1,*

Affiliation

  1. Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 400028 Cluj-Napoca
  2. Iuliu Hatieganu University of Medicine and Pharmacy, Orthopedic Surgery Department, 400015 Cluj-Napoca

Abstract

Citrate capped gold nanoparticles of controlled size in aqueous solution were prepared and their interaction with L-cysteine was investigated, monitoring their UV-Vis spectra, for different cysteine concentrations and various mixing ratios, as well as by transmission electron microscopy and atomic force microscopy. The interaction of gold nanoparticles with cysteine is quite strong, due to the peculiar affinity of S-atoms for gold. Cysteine is probably bound to the gold surface by its thiol group. AFM images evidence ordered gold nanoparticles assemblies mediated by cysteine. Our findings are in substantial agreement with existing data for other self-assembled organosulphur compounds on gold surfaces..

Keywords

Gold nanoparticles; Self-assembly; L-Cysteine; S-Au interaction.

Submitted at: Feb. 25, 2008
Accepted at: Aug. 28, 2008

Citation

I. PETEAN, GH. TOMOAIA, O. HOROVITZ, A. MOCANU, M. TOMOAIA-COTISEL, Cysteine mediated assembly of gold nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2289-2292 (2008)