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DNA-Controlled Self Assembly of Gold Nanoparticles

par Doyen, Matthieu;Bartik, Kristin ;Bruylants, Gilles
Référence International Symposium on Advanced Complex Inorganic Nanomaterials (11-14/09/2011: Namur)
Publication Non publié, 2011-09-11

Poster de conférence

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Résumé :

Many efforts have been devoted during the last years to produce both two (2D) and threedimensional (3D) superlattices of metallic, insulating or semiconducting nanoparticles capped with organic ligands. These lattices can be considered as artificial crystals in which the nanoparticles take the place of atoms in traditional crystals. Their potential lies in the emergence, from the ordered periodic arrangement of the nanoparticles, of collective electric, magnetic and optical properties. By varying the nature, size or shape of the nanocrystals and their 2D or 3D organization, a vast diversity of metamaterials with tuneable properties can be envisaged, promising a wide range of advanced application, including sensing. We are interested in the controlled auto-assembly of gold particles using the selective pairing potential of DNA oligonucleotides. A prerequisite to auto-assembly is to obtain monodispersed nanoparticles. The citrate reduction of gold(III) in water is one of the most commonly used synthesis pathway for the preparation of gold colloids (Turkevich method [1]) and the pH, temperature and relative concentrations of gold and citrate are key parameters determining the final size and size distribution of the nanoparticles [2]. However, the nucleation and growth mechanisms remain unclear and are the subject of intense research. We have used NMR spectroscopy to investigate the nucleation and growth kinetics of gold nanoparticles [3] and our results enable us to obtain insight into the role of citrate and its oxidation products on the synthesis process. The synthesized nanoparticles have been functionalized using different complementary oligonucleotide strands in order to highlight the factors (linker length, number and nature of the complementary bases, ionic force, … ) which are critical for the formation of 2D and 3D superlattices. 1. J. Turkevich, P. C. Stevenson and J. Hillier, Discuss. Faraday Soc. 11, 55 (1951). 2. X. Ji, X. Song, J. Li, Y. Baiç, W. Yang and X. Peng, J. Am. Chem. Soc. 129, 13939 (2007). 3. G. Bruylants, K. Bartik and M.P. Delplancke-Ogletree, Proceedings of the ENCF Conference, 5p (2010).