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Specific functionalization of CTAB stabilized anisotropic gold nanoparticles with polypeptides for folding-mediated self-assembly
Nanyang Technology University, Singapore Nanyang Technology University, Singapore .
Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7001-9415
Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics. Linköping University, The Institute of Technology.
Nanyang Technology University, Singapore .
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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
Royal Society of Chemistry , 2012. Vol. 22, no 38, 20368-20373 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-84914DOI: 10.1039/c2jm31176cISI: 000308658600039OAI: diva2:562877

Funding Agencies|Knut and Alice Wallenberg Foundation (KAW)||Swedish Research Council (VR)||Swedish Foundation for Strategic Research (SSF)||

Available from: 2012-10-26 Created: 2012-10-26 Last updated: 2014-10-08

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