Issue 40, 2014

Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

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(ω), dielectric constant ε(ω), transverse optical phonon (TO) and longitudinal (LO) optical phonon modes. We determined various optical constant values n(ω) and ε(ω) 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(ω) and ε(ω) 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).

Graphical abstract: Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

Additions and corrections

Article information

Article type
Paper
Submitted
22 Feb 2014
Accepted
25 Apr 2014
First published
30 Apr 2014

RSC Adv., 2014,4, 20902-20908

Author version available

Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

R. Zamiri, A. Rebelo, G. Zamiri, A. Adnani, A. Kuashal, M. S. Belsley and J. M. F. Ferreira, RSC Adv., 2014, 4, 20902 DOI: 10.1039/C4RA01563K

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