Diffraction-limited photogeneration and characterization of silver nanoparticles

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

Research output: Contribution to journalArticle

88 Citations (Scopus)

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
StatePublished - Feb 5 2004
Externally publishedYes

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Silver
Diffraction
silver
Nanoparticles
nanoparticles
diffraction
Luminescence
routes
luminescence
Optical data storage
Laser excitation
data storage
photoproduction
Ultraviolet spectroscopy
Absorption spectroscopy
Light sources
Raman scattering
Absorption spectra
absorption spectroscopy
Lighting

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Diffraction-limited photogeneration and characterization of silver nanoparticles. / Monti Masel, Oliver L A; Fourkas, John T.; Nesbitt, David J.

In: Journal of Physical Chemistry B, Vol. 108, No. 5, 05.02.2004, p. 1604-1612.

Research output: Contribution to journalArticle

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