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Photo-induced formation of Au-Ag nanowires complex on DNA support

I. R. BUNGHEZ1, O. DUMITRESCU2,* , E. VASILE3, S. DONCEA1, R.M. ION1

Affiliation

  1. National R&D Institute for Chemistry and Petrochemistry – ICECHIM, Bucharest, 060021, Romania
  2. Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, Polizu Street No 1, 011061, Bucharest, Romania
  3. S. C. METAV- Research-Development S.A, Bucharest, Romania

Abstract

A UV-photoirradiation method has been proved for a novel, easy mode for the synthesis of semi-conducting Au-Ag nanowires complex on DNA. The nanowires have average diameters ranging from 2-50 nm in length. During Au-Ag alloy nanowire synthesis, the DNA acts as both as a reducing agent and as a non-specific capping agent for the metal nanoparticles. The Au-Ag alloy nanowires are important for the synthesis of composite nanowires for functional nanodevices, sensors, miniature computers or optoelectronics. In this article is presented the process of obtaining of DNAgold nanoparticles, DNA-silver nanoparticles and DNA-Au-Ag nanoparticles which were prepared by chemical reduction of DNA- metal (Au and Ag) complex. The DNA-Au (III) was formed by reacting DNA with a 10-2 M of HAuCl4 solution and the DNA-Ag was formed by reacting DNA with a 10-2 M of an AgNO3 solution. The complex in solution reacted with EDTA reducing Au (III) and Ag (I) to Au and Ag. So, these solutions are responsible for creating nanodimensional aggregates. The particle distributions were obtained by transmission electron microscopy (TEM). This method, of metallic nanoparticles incorporated and stabilized by DNA, has resulted in a rather uniform dispersion of Ag, Au, Ag-Au nanoparticles of spherical shape and 2~50 nm in diameter..

Keywords

DNA, Gold and silver nanowires complexes, Metallic nanoparticles.

Submitted at: Jan. 14, 2013
Accepted at: Nov. 7, 2013

Citation

I. R. BUNGHEZ, O. DUMITRESCU, E. VASILE, S. DONCEA, R.M. ION, Photo-induced formation of Au-Ag nanowires complex on DNA support, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 11-12, pp. 1380-1384 (2013)