Ultraviolet Nanoplasmonics: A Demonstration of Surface-Enhanced Raman Spectroscopy, Fluorescence, and Photodegradation Using Gallium Nanoparticles

Self-assembled arrays of hemispherical gallium nanoparticles deposited by molecular beam epitaxy on a sapphire support are explored as a new type of substrate for ultraviolet plasmonics. Spin-casting a 5 nm film of crystal violet upon these nanoparticles permitted the demonstration of surface-enhanc...

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Veröffentlicht in:	Nano letters 2013-06, Vol.13 (6), p.2837-2841
Hauptverfasser:	Yang, Yang, Callahan, John M, Kim, Tong-Ho, Brown, April S, Everitt, Henry O
Format:	Artikel
Sprache:	eng
Schlagworte:	Arrays 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 Deposition Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Exact sciences and technology Fluorescence Lasers Materials science Methods of nanofabrication Nanocrystalline materials Nanoparticles Nanoscale materials and structures: fabrication and characterization Nanostructure Physics Plasmonics Self-assembly Surface and interface electron states Ultraviolet
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Zusammenfassung:	Self-assembled arrays of hemispherical gallium nanoparticles deposited by molecular beam epitaxy on a sapphire support are explored as a new type of substrate for ultraviolet plasmonics. Spin-casting a 5 nm film of crystal violet upon these nanoparticles permitted the demonstration of surface-enhanced Raman spectra, fluorescence, and degradation following excitation by a HeCd laser operating at 325 nm. Measured local Raman enhancement factors exceeding 107 demonstrate the potential of gallium nanoparticle arrays for plasmonically enhanced ultraviolet detection and remediation.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl401145j