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Open AccessArticle

DNA-Promoted Auto-Assembly of Gold Nanoparticles: Effect of the DNA Sequence on the Stability of the Assemblies

Engineering of Molecular NanoSystems, Ecole polytechnique de Bruxelles, CP 165/64, Université libre de Bruxelles, 50 av. F.D. Roosevelt, Brussels 1050, Belgium
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Polymers 2013, 5(3), 1041-1055; https://doi.org/10.3390/polym5031041
Received: 26 June 2013 / Revised: 12 July 2013 / Accepted: 15 July 2013 / Published: 22 July 2013
(This article belongs to the Special Issue Supramolecular Chemistry and Self-Assembly)
The use of deoxyribonucleic acid (DNA) oligonucleotides has proven to be a powerful and versatile strategy to assemble nanomaterials into two (2D) and three-dimensional (3D) superlattices. With the aim of contributing to the elucidation of the factors that affect the stability of this type of superlattices, the assembly of gold nanoparticles grafted with different DNA oligonucleotides was characterized by UV-Vis absorption spectroscopy as a function of temperature. After establishing an appropriate methodology the effect of (i) the length of the grafted oligonucleotides; (ii) the length of their complementary parts and also of (iii) the simultaneous grafting of different oligonucleotides was investigated. Our results indicate that the electrostatic repulsion between the particles and the cooperativity of the assembly process play crucial roles in the stability of the assemblies while the grafting density of the oligonucleotide strands seems to have little influence. View Full-Text
Keywords: gold nanoparticles; oligonucleotides; superlattices; thermal stability; UV-Vis absorption spectroscopy gold nanoparticles; oligonucleotides; superlattices; thermal stability; UV-Vis absorption spectroscopy
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Doyen, M.; Bartik, K.; Bruylants, G. DNA-Promoted Auto-Assembly of Gold Nanoparticles: Effect of the DNA Sequence on the Stability of the Assemblies. Polymers 2013, 5, 1041-1055.

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