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(u), dielectric constant 3(u), transverse optical phonon (TO) and longitudinal (LO) optical phonon modes. We determined various optical constant values n(u) and 3(u) 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(u) and 3(u) 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

Electrochemical heavy metal detection, photocatalytic, photoluminescence, biodiesel production and antibacterial activities of Ag–ZnO nanomaterial

“…1.The XRD pattern of pure ZnO( In the case of Ag-ZnO Nps the intensity of peak is reduced due to the formation of Ag nanoparticles on the surface of ZnO Nps [30] . A broad peak at 3434 cm -1 (stretching) and 1330cm -1 to 1670 cm -1 (bending) indicates the presence of hydroxyl residue which is due to atmospheric moisture [31,32].…”

Highly porous, honeycomb like Ag–ZnO nanomaterials for enhanced photocatalytic and photoluminescence studies: green synthesis using Azadirachta indica gum

“…In this, significant vibrational band observed in the range of 400-500 cm −1 is corresponds characteristic stretching mode of Zn-O bond. In the IR spectra of Ag-ZnO Nps, intensity of the peak is reduced because of the formation of Ag nanoparticles on the surface of ZnO [27]. A broad peak at 3431 cm −1 (stretching) and 1330-1670 cm −1 (bending) indicates the presence of adsorbed atmospheric moisture [28,29].…”

Toxicity of ZnO/TiO2‐conjugated carbon‐based nanohybrids on the coastal marine alga Thalassiosira pseudonana

“…The peaks of the D band in CNT‐based NHs exhibit more significance compared to that of the D band in the GO‐based material, indicating better stability in the structure of GO‐based NHs compared to that of CNT‐based nanocomposites . The presence of the anatase TiO 2 polymorph was confirmed with peaks at 398, 519 — , and 641 cm −1 , and E2 and E1 (LO) modes of the wurtzite ZnO structure were verified at 430 and 580 cm −1 peaks …”

“…However, as revealed in Figure B, no distinct peaks were found in the CNT spectrum at 500 to 4000 cm −1 . There were several peaks (OH, CH, CO, CC, and CO) from the spectrum of ZnO‐CNT to TiO 2 ‐CNT, with the peaks at 1300 cm −1 (TiOH) and 550 cm −1 (TiOTi) …”