Kinetic studies of the photogeneration of silver nanoparticles

Thomas A. Baker, Oliver L A Monti Masel, David J. Nesbitt

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Stable, intensely Raman active silver nanoparticles are photogenerated by visible light from silver ions in a thin polymer film within a diffraction-limited focal area. The emission is resolved both spectrally and temporally to demonstrate that the source of the signal is surface-enhanced Raman scattering (SERS) from multiple silver nanoparticles generated in the diffraction-limited spot. The time evolution of the SERS signal is sigmoidal in shape and well described by Avrami phase transformation kinetics. The rate constant for the Avrami transformation depends linearly on illumination intensity, consistent with single photon photoreduction of the silver percholorate startingmaterial as the limiting step to form silver nanoparticles. The asymptotic kinetic growth SERS signal exhibits a linear dependence on illumination intensity. Avrami analysis of the kinetics indicates that transformation is constrained to two dimensions, consistent with the ̃10 nm thin film nature of the sample. The technique presented provides a novel route to large-scale periodic molecular sensor arrays with long-term stability, diffraction-limited resolution (<1 μm), and laser-based spatial/temporal control of the formation kinetics.

Original languageEnglish (US)
Pages (from-to)9861-9870
Number of pages10
JournalJournal of Physical Chemistry C
Volume115
Issue number20
DOIs
StatePublished - May 26 2011

Fingerprint

Silver
silver
Nanoparticles
nanoparticles
kinetics
Raman scattering
Diffraction
Raman spectra
Lighting
illumination
diffraction
Thin films
Growth kinetics
Sensor arrays
Polymer films
photochemical reactions
phase transformations
Rate constants
Photons
Phase transitions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Kinetic studies of the photogeneration of silver nanoparticles. / Baker, Thomas A.; Monti Masel, Oliver L A; Nesbitt, David J.

In: Journal of Physical Chemistry C, Vol. 115, No. 20, 26.05.2011, p. 9861-9870.

Research output: Contribution to journalArticle

Baker, Thomas A. ; Monti Masel, Oliver L A ; Nesbitt, David J. / Kinetic studies of the photogeneration of silver nanoparticles. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 20. pp. 9861-9870.
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