The European Physical Journal D

, Volume 49, Issue 1, pp 93–100 | Cite as

Tunable variation of optical properties of polymer capped gold nanoparticles

Article

Abstract

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 

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Copyright information

© Springer 2008

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia

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