Threading plasmonic nanoparticle strings with light

Lars O. Herrmann, Ventsislav K. Valev, Christos Tserkezis, Jonathan S. Barnard, Setu Kasera, Oren A. Scherman, Javier Aizpurua, Jeremy J. Baumberg

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)
171 Downloads (Pure)

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±2nm wide. This precision is achieved because the nanoparticles are first chemically assembled into chains with rigidly controlled separations of 0.9nm 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.

Original languageEnglish
Article number4568
Number of pages6
JournalNature Communications
Volume5
Early online date28 Jul 2014
DOIs
Publication statusPublished - 28 Jul 2014

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