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Paper   IPM / Physic / 12972
School of Physics
  Title:   Localized Surface Plasmon Resonance properties of copper nano-clusters: A theoretical study of size dependence
1.  A. Ziashahabi
2.  T. Ghodselahi
3.  M. Heidari Saani
  Status:   Published
  Journal: J. Phs. Chem. of Solid
  Vol.:  74
  Year:  2013
  Pages:   929-933
  Supported by:  IPM
Density functional theory (DFT) calculations are carried out to study the electronic, structural stability and Localized Surface Plasmon Resonance (LSPR) properties of copper nano-clusters. These nanoclusters consisted of 14, 38, 62 and 116 atoms. We studied surface charge density and interbandtransitions effects on damping and broadening of the surface plasmon resonance absorption spectra. An enhancement in interband-transition energy and a reduction in surface charge density with decrease in the size of clusters are observed. These features result in the damping and broadening of the LSPR absorption spectra. We also study the structural stability and HOMO-LUMO energy gap of copper clusters. The structural stability of nano-clusters reduces by decreasing the size of the clusters. The HOMO-LUMO energy gap is not zero for the clusters with size less than 2 nm which indicates the lack of conduction electrons which are necessary for LSPR absorption. The calculated interband transition energies are in agreement with LSPR absorption data.We also discuss the difference between size dependent LSPR in copper and gold nano-clusters in the experiment based on calculated surface charge density.

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