Far-infrared optical constants of ZnO and ZnO/Ag nanostructures
authors Zamiri, R; Rebelo, A; Zamiri, G; Adnani, A; Kuashal, A; Belsley, MS; Ferreira, JMF
nationality International
journal RSC ADVANCES
keywords ENHANCED RAMAN-SCATTERING; CORE-SHELL NANOCOMPOSITES; PHOTOCATALYTIC PROPERTIES; SILVER NANOPARTICLES; LASER-ABLATION; SEMICONDUCTOR; NANOCRYSTALS; FABRICATION; NANOWIRES; NANOTUBES
abstract We report on the synthesis of ZnO nanoplates and ZnO nanoplate/Ag nanoparticle heterostructures via a simple and cost effective wet chemical precipitation method. The prepared samples were characterized for structural and optical properties by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), UV-VIS reflectance, Raman, and FT-IR spectroscopy. The Kramers-Kronig (K-K) method and classical dispersion theory was applied to calculate the far-infrared optical constants such as, refractive index n(omega), dielectric constant epsilon(omega), transverse optical phonon (TO) and longitudinal (LO) optical phonon modes. We determined various optical constant values n(omega) and epsilon(omega) for ZnO nanostructures in the range of 0 to 9 and 0 to 70, respectively. Whereas, for Ag deposition on ZnO nanostructures, the corresponding n(omega) and epsilon(omega) values were found to be increased in the range of 0 to 30 and 0 to 800, respectively. The TO and LO optical phonon modes of ZnO nanoplate/Ag nanoparticle heterostructures were also found to be higher (416 cm(-1), 620 cm(-1)) when compared with corresponding values obtained for ZnO nanoplates (415 cm(-1), 604 cm(-1)).
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2014
volume 4
issue 40
beginning page 20902
ending page 20908
digital object identifier (doi) 10.1039/c4ra01563k
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000336833400036
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journal analysis (jcr 2019):
journal impact factor 3.119
5 year journal impact factor 3.098
category normalized journal impact factor percentile 59.04
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