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      Optical response of Ag-Au bimetallic nanoparticles to electron storage in aqueous medium

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      Author(s)
      Tunc, I.
      Guvenc, H. O.
      Sezen, H.
      Süzer, Şefik
      Correa-Duarte, M. A.
      Liz-Marzán, L. M.
      Date
      2008
      Source Title
      Journal of Nanoscience and Nanotechnology
      Print ISSN
      1533-4880
      Volume
      8
      Issue
      6
      Pages
      3003 - 3007
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Composition and structure dependence of the shift in the position of the surface plasmon resonance band upon introduction of NaBH 4 to aqueous solutions of gold and silver nanoparticles are presented. Silver and gold nanoalloys in different compositions were prepared by co-reduction of the corresponding salt mixtures using sodium citrate as the reducing agent. After addition of NaBH 4 to the resultant nanoalloys, the maximum of their surface plasmon resonance band, ranging between that of pure silver (ca. 400 nm) and of pure gold (ca. 530 nm), is blue-shifted as a result of electron storage on the particles. The extent of this blue shift increases non-linearly with the mole fraction of silver in the nanoparticle, parallel to the trends reported previously for both the frequency and the extinction coefficient of the plasmon band shifts. Gold(core)@silver(shell) nanoparticles were prepared by sequential reduction of gold and silver, where addition of NaBH 4 results in relatively large spectral shift in the plasmon resonance band when compared with the nanoalloys having a similar overall composition. The origin of the large plasmon band shift in the core-shell is related with a higher silver surface concentration on these particles. Hence, the chemical nature of the nanoparticle emerges as the dominating factor contributing to the extent of the spectral shift as a result of electron storage in bimetallic systems. Copyright © 2008 American Scientific Publishers All rights reserved.
      Keywords
      Core-shell structure
      Gold and silver nanoparticles
      Spectral shifts
      Aqueous medium
      Bi-metallic nanoparticles
      Charge storage
      Electron storage
      Optical responses
      Structure dependence
      Gold
      Surface plasmon resonance
      Silver
      Permalink
      http://hdl.handle.net/11693/23104
      Published Version (Please cite this version)
      http://dx.doi.org/10.1166/jnn.2008.157
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