Peter Njoki - Size correlation of optical and spectroscopic properties for gold nanoparticles

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  Publication Details (including relevant citation   information):

  JOURNAL OF PHYSICAL CHEMISTRY C    Volume:   111    Issue: 40    Pages:   14664-14669    Published: OCT 11 2007

  Cited: 63 and References: 30

  Abstract:

  While the optical and spectroscopic properties of gold   nanoparticles are  widely used for chemical, bioanalytical,   and biomedical applications,  the study of the size   correlation with these properties for  nanoparticles in   solutions is rather limited. This paper describes the    results of a systematic study of such a correlation for   gold  nanoparticles with diameters ranging from 10 to 100 nm   in aqueous  solutions. The high monodispersity of these   nanoparticles permitted a  meaningful correlation of the   particle size with the surface plasmon  (SP) resonance band   properties and the surface-enhanced Raman scattering  (SERS)   spectroscopic properties. This correlation is compared to   the  results from the simulation based on Mie theory. The   close agreement  between the experimental and the   theoretical results provides insight  into the validity of   determining the wavelength of the SP resonance band  as a   measure of the particle size. The size correlation with the   SERS  intensity from the adsorption of 4-mercaptobenzoic   acid on the  nanoparticles in aqueous solutions reveals the   existence of a critical  size of the nanoparticles in the   solution beyond which the  particle-particle interaction is   operative and responsible for the SERS  effect. These   findings serve as the basis of size correlations for    exploiting the optical and spectroscopic properties of gold    nanoparticles of different sizes in aqueous solutions in   analytical or  bioanalytical applications.

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