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Synthesis and Optical Properties of Oriented Cu Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Om Parkash Siwach  and
P. Sen
Om Parkash Siwach
Affiliation:
opsiwach@gmail.com, Jawaharlal Nehru University, School of Physical Sciences, India
P. Sen
Affiliation:
psen0700@mail.jnu.ac.in, India
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Abstract

Crystallographic orientation of atomic planes makes a metal amenable to specific properties as desired in catalysis and environment sensing. Oriented metal nanoparticles are however less known. Here we present X-ray diffraction, transmission electron microscopy and atomic force microscopy data to provide evidence of copper nanoparticles with preferred orientation, achieved by electro-explosion of copper wires in an aqueous medium. The optical absorption in these particles is devoid of the usual Mie resonance at ∼ 580 nm, while maintaining bulk-like lattice periodicity. Under the highest reorientation (largest orientation index), absorption in the ultraviolet region is characterized by distinct and sharp resonant peaks, which are correlated with occupied valence band density of state (DOS) from copper clusters, making these truly crystalline particles with atom-like electronic properties.

Keywords

optical propertiesnanoscaleCu
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O03-31
Copyright
Copyright © Materials Research Society 2006

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