“School of Physic”
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| Paper IPM / Physic / 12972 |
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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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