Plasmonic Properties of Copper Nanoparticles Fabricated by Nanosphere Lithography

The localized surface plasmon resonance (LSPR) of oxide-free Cu nanoparticles fabricated by nanosphere lithography is examined by UV−vis extinction spectroscopy and electrodynamics theory. The LSPR of the Cu nanoparticles is significantly affected by the presence of copper oxides and the removal of...

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Veröffentlicht in:	Nano letters 2007-07, Vol.7 (7), p.1947-1952
Hauptverfasser:	Chan, George H, Zhao, Jing, Hicks, Erin M, Schatz, George C, Van Duyne, Richard P
Format:	Artikel
Sprache:	eng
Schlagworte:	Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Exact sciences and technology Materials science Methods of nanofabrication Nanocrystalline materials Nanolithography Nanoscale materials and structures: fabrication and characterization Physics Surface and interface electron states
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Zusammenfassung:	The localized surface plasmon resonance (LSPR) of oxide-free Cu nanoparticles fabricated by nanosphere lithography is examined by UV−vis extinction spectroscopy and electrodynamics theory. The LSPR of the Cu nanoparticles is significantly affected by the presence of copper oxides and the removal of the oxide species yields a dramatic difference in the observed LSPR. From a comparison of the LSPR of Cu, Ag, and Au nanoparticles of similar geometry, we conclude that Cu displays an intense and narrow LSPR peak that is comparable to Ag and Au.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl070648a