Web Release Date: November 2,
Surface Plasmon Resonance Spectra of 2.8 ± 0.5 nm Diameter Copper Nanoparticles in Both Near and Far Fields
Defence R&D Canada-Suffield, Suffield, Alberta, T1A 8K6, Canada
Received: June 29, 2007
In Final Form: September 12, 2007
Abstract:
Cu nanoparticles of 2.8 ± 0.5 nm diameter were synthesized in the gas phase using a sputtering-aggregation-type source. High-density films of nanoparticles were deposited onto NaCl substrates, and strong interparticle coupling was observed. In the near-field spectrum, the surface plasmon absorption was more intense than, and shifted 20 nm to longer wavelengths from, that observed in the far-field spectrum. These are the first near-field spectra of such small Cu nanoparticles, and the results agree well with theoretical predictions.
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