Journal
APPLIED NANOSCIENCE
Volume 2, Issue 3, Pages 285-291Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13204-012-0106-8
Keywords
Cu nanoparticles; Laser ablation; Surface plasma resonance; Interband transition
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Funding
- DST, Government of India [SR/FTP/PS-67/2008]
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Copper (Cu) nanoparticles of average sizes (radius in nm) varying between 1.7 and 6 nm have been prepared by 1,064 nm Nd:YAG laser ablation of solid copper target in water medium. The nanostructures of the samples have been characterized using high-resolution transmission electron microscopes (HRTEM). The UV-visible absorption spectra obtained with a UV-visible spectrophotometer show sharp absorptions in the ultraviolet region and visible region due to the interband transition and surface plasmon resonance (SPR) oscillations in Cu nanoparticles, respectively. The increase in the linewidth of the SPR absorption peaks with the reduction in particle sizes are observed due to the intrinsic size effects. The behaviour of the UV-visible spectra associated with the Cu nanoparticles is studied as a function of laser fluence and laser ablation time.
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