Threading plasmonic nanoparticle strings with light

Lars O. Herrmann, Ventsislav K. Valev (), Christos Tserkezis, Jonathan S. Barnard, Setu Kasera, Oren A. Scherman, Javier Aizpurua and Jeremy J. Baumberg ()
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Lars O. Herrmann: Cavendish Laboratory, NanoPhotonics Centre, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, UK
Ventsislav K. Valev: Cavendish Laboratory, NanoPhotonics Centre, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, UK
Christos Tserkezis: Donostia International Physics Center DIPC and Centro de Física de Materiales CSIC-UPV/EHU Paseo Manuel de Lardizabal 5
Jonathan S. Barnard: Charles Babbage Road, University of Cambridge
Setu Kasera: Melville Laboratory for Polymer Synthesis, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
Oren A. Scherman: Melville Laboratory for Polymer Synthesis, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
Javier Aizpurua: Donostia International Physics Center DIPC and Centro de Física de Materiales CSIC-UPV/EHU Paseo Manuel de Lardizabal 5
Jeremy J. Baumberg: Cavendish Laboratory, NanoPhotonics Centre, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, UK

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Nanomaterials find increasing application in communications, renewable energies, electronics and sensing. Because of its unsurpassed speed and highly tuneable interaction with matter, using light to guide the self-assembly of nanomaterials can open up novel technological frontiers. However, large-scale light-induced assembly remains challenging. Here we demonstrate an efficient route to nano-assembly through plasmon-induced laser threading of gold nanoparticle strings, producing conducting threads 12±2 nm wide. This precision is achieved because the nanoparticles are first chemically assembled into chains with rigidly controlled separations of 0.9 nm primed for re-sculpting. Laser-induced threading occurs on a large scale in water, tracked via a new optical resonance in the near-infrared corresponding to a hybrid chain/rod-like charge transfer plasmon. The nano-thread width depends on the chain mode resonances, the nanoparticle size, the chain length and the peak laser power, enabling nanometre-scale tuning of the optical and conducting properties of such nanomaterials.

Date: 2014
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DOI: 10.1038/ncomms5568

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