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colloidal-copper
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Size, composition and optical properties of copper nanoparticles prepared by laser ablation in liquids
, Article Applied Physics A: Materials Science and Processing ; Volume 88, Issue 2 , 2007 , Pages 415-419 ; 09478396 (ISSN) ; Iraji Zad, A ; Mahdavi, M ; Sharif University of Technology
2007
Abstract
Colloidal copper nanoparticles were prepared by pulsed Nd:YAG laser ablation in water and acetone. Size and optical properties of the nanoparticles were characterized by transmission electron microscopy and UV-visible spectrophotometry, respectively. The copper particles were rather spherical and their mean diameter in water was 30 nm, whereas in acetone much smaller particles were produced with an average diameter of 3 nm. Optical extinction immediately after the ablation showed surface plasmon resonance peaks at 626 and 575 nm for the colloidal copper in water and acetone, respectively. Time evaluation showed a blue shift of the optical extinction maximum, which is related to the change of...