Diffraction-limited photogeneration and characterization of silver nanoparticles

Oliver L A Monti Masel, John T. Fourkas, David J. Nesbitt

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Abstract

Visible-light-induced photogeneration of silver nanoparticles in a diffraction-limited focal region is demonstrated. The photochemical growth depends quadratically on illumination intensity indicative of a multiphoton generation process, with the identity of the silver nanoparticles confirmed by UV/vis absorption spectroscopy. Mie simulations of the absorption spectrum reveal a size distribution dominated by Ag particles with radii in the range of a few nanometers. Spectrally resolved laser excitation and emission studies demonstrate that the likely luminescence source is surface-enhanced Raman scattering from silver nanoparticles, with spectral jumps occurring on a time scale comparable to that of fluctuations in the total luminescence intensity. Possible routes for the photogeneration process as well as identity of the Raman-active species are discussed. Such diffraction-limited photoproduction methods for luminescent silver nanoparticles offer novel routes toward optical data storage and nanometer-scale molecular sensing.

Original languageEnglish (US)
Pages (from-to)1604-1612
Number of pages9
JournalJournal of Physical Chemistry B
Volume108
Issue number5
Publication statusPublished - Feb 5 2004
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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