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Specific functionalization of CTAB stabilized anisotropic gold nanoparticles with polypeptides for folding-mediated self-assembly
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2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 38, 20368-20373 p.Article in journal (Refereed) Published
Abstract [en]

Anisotropic nanoparticles stabilized by cetyltrimethylammonium bromide (CTAB) are notoriously difficult to homogenously functionalize using conventional gold-thiol chemistry. Using surface assisted laser desorption time of flight mass spectroscopy and scanning transmission electron microscopy-energy dispersive X-ray spectroscopy, we demonstrate that silver species adsorbed on the particle surface prevent effective surface functionalization. When covered by a thin gold film, particle functionalization was drastically improved. A thiol-containing polypeptide was immobilized on arrowhead gold nanorods (NRs) and was subsequently able to selectively heteroassociate with a complementary polypeptide resulting in a folding-mediated bridging aggregation of the NRs. Despite using arrowhead NRs with a pronounced difference in surface arrangement on the {111} facets on the arrowheads compared to the {100} facets at the particle sides, the polypeptides were efficiently and homogeneously immobilized on the particles after gold film overgrowth.

Place, publisher, year, edition, pages
2012. Vol. 22, no 38, 20368-20373 p.
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-183931DOI: 10.1039/c2jm31176cISI: 000308658600039OAI: oai:DiVA.org:uu-183931DiVA: diva2:565309
Available from: 2012-11-07 Created: 2012-11-05 Last updated: 2012-11-07Bibliographically approved

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Baltzer, Lars
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