Tunable variation of optical properties of polymer capped gold nanoparticles
Department of Physics, Indian Institute of Science, Bangalore, 560012, India
Corresponding author: a email@example.com
Revised: 7 May 2008
Published online: 16 July 2008
Optical properties of polymer capped gold nanoparticles of various sizes (diameter 3-6 nm) have been studied. We present a new scheme to extract size dependent variation of total dielectric function of gold nanoparticles from measured UV-Vis absorption data. The new scheme can also be used, in principle, for other related systems as well. We show how quantum effect, surface atomic co-ordination and polymer-nanoparticle interface morphology leads to a systematic variation in interband part of the dielectric function of gold nanoparticles, obtained from the analysis using our new scheme. Careful analysis enables identification of the possible changes to the electronic band structure in such nanoparticles.
PACS: 78.67.Bf – Nanocrystals and nanoparticles / 82.35.Np – Nanoparticles in Polymers / 78.40.-q – Absorption and reflection spectra: visible and ultraviolet / 73.22.-f – Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008