A Flexible Method for the Fabrication of Gold Nanostructures Using Oligonucleotide Derivatives

Eritja, Ramón; Aviñó, Anna; Torre, Beatriz G. de la; Fitzmaurice, Donald; Ongaro, Andrea; Stanca, Sarmiza Elena; DiSalvo, Andrea; Maninng, Brendan; Iacopino, Daniela

doi:10.1080/15257770701548675

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“…The most common approach for self-assembly of metal nanoparticles exploits the known affinity between gold and sulfur groups thus relying on the use of thiol-functionalized linking molecules. Numerous molecules containing thiol and dithiol groups were used as linkers including aliphatic [17] and aromatic thiols [18], biological compounds [19,20] and single strand oligonucleotides [21,22]. The addition of controlled aliquots of such linkers to nanocrystal solutions gave rise to controlled growth and formation of geometrically well-defined nanocrystal clusters.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Gold Nanocrystals into Discrete Coupled Plasmonic Structures

et al. 2016

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Development of methodologies for the controlled chemical assembly of nanoparticles into plasmonic molecules of predictable spatial geometry is vital in order to harness novel properties arising from the combination of the individual components constituting the resulting superstructures. This paper presents a route for fabrication of gold plasmonic structures of controlled stoichiometry obtained by the use of a di-rhenium thio-isocyanide complex as linker molecule for gold nanocrystals. Correlated scanning electron microscopy (SEM)-dark-field spectroscopy was used to characterize obtained discrete monomer, dimer and trimer plasmonic molecules. Polarization-dependent scattering spectra of dimer structures showed highly polarized scattering response, due to their highly asymmetric D ∞h geometry. In contrast, some trimer structures displayed symmetric geometry (D 3h ), which showed small polarization dependent response. Theoretical calculations were used to further understand and attribute the origin of plasmonic bands arising during linker-induced formation of plasmonic molecules. Theoretical data matched well with experimentally calculated data. These results confirm that obtained gold superstructures possess properties which are a combination of the properties arising from single components and can, therefore, be classified as plasmonic molecules.

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