Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 114, Issue 12, Pages 4199-4203Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp912103t
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The size stability of nanoparticles is crucial from an application point of view. We probe, using Raman spectroscopy, particle size evolution of US nanoparticles by varying laser power. Multiphonon resonant Raman scattering has also been demonstrated. With increase in laser power, the intensity ratio of 2-longitudinal optical (LO) to 1-LO is found to increase dramatically, and LO phonon overtones LIP to fourth order are observed. Resonant Raman scattering has been achieved by suitably matching the band gap with the excitation photon energy, by varying the local temperature. The effect of increase in local temperature on the band gap is also discussed.
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