2006/06/23 by Oleg A. Yeshchenko, Igor Dmitruk, Yeshchenko, Oleg A. +5
Engineering · Materials Science · #Copper-based nanomaterials and applications #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Laser-Ablation Synthesis of Nanoparticles #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.cond-mat/0606613
openalex publication_date 2006/06/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Copper nanoparticles have been grown in silica matrix by annealing of the\nsol-gel prepared porous matrix impregnated with the copper nitrate. The\nannealing has been performed in air, successively in air and hydrogen, and in\nhydrogen. Cu nanoparticles in size range of 2-65 nm have been grown depending\non annealing conditions. Annealing in air results in copper oxide nanoparticles\n(Cu2O) growth as well. Transmission electron microscopy (TEM) and optical\nspectroscopy of the copper nanoparticles in silica matrix have been performed.\nThe copper nanoparticles of two types are grown: spherical mature particles and\nelliptical seed particles. The surface plasmon peak has been observed clearly\nin absorption spectra of Cu nanoparticles. Surface plasmon peak in absorption\nspectra of Cu nanoparticles demonstrates slight blue shift with decrease of the\nparticle size. The half-width of the surface plasmon peak decreases appreciably\nat the lowering of temperature from 293 K to 77 and 4.2K that is due to strong\nelectron-phonon interaction. The low-frequency Raman scattering data are in\nagreement with electron microscopy and absorption data. Photoluminescence from\nthe copper nanoparticles has been observed. Efficiency of the luminescence\nincreases appreciably at the decrease of particle size. The observed increase\nis explained, probably, by the coupling of the excited incoming and outgoing\nemitted photons with surface plasmon.\n