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We demonstrate a new method to program the ligation of single stranded DNA-modified gold nanoparticles using copper-free click chemistry. Gold nanoparticles functionalized with a discrete number of 3'-azide or 5'-alkyne modified oligonucleotides, can be brought together via a splint strand and covalently 'clicked', in a simple one-pot reaction. This new approach to the assembly of gold nanoparticles is inherently advantageous in comparison to the traditional enzymatic ligation. The chemical ligation is specific and takes place at room temperature by simply mixing the particles without the need for special enzymatic conditions. The yield of 'clicked' nanoparticles can be as high as 92%. The ease of the copper-free, 'click-ligation' method allows for its universal applicability and opens up new avenues in programmed nanoparticle organization.

Original publication

DOI

10.1039/c3nr02362a

Type

Journal article

Journal

Nanoscale

Publication Date

21/08/2013

Volume

5

Pages

7209 - 7212

Keywords

Alkynes, Azides, Click Chemistry, Copper, DNA, Single-Stranded, Gold, Metal Nanoparticles, Temperature