Synthesis and comparative study on the structural and optical properties of ZnO doped with Ni and Ag nanopowders fabricated by sol gel technique

Abstract

In this work we have tried to prepare Ni and Ag doped ZnO nanopowders using the sol gel technique. The influence of Ni and Ag (1, 3 and 5 mol.%) on the crystalline structure and optical properties of ZnO was investigated. The samples were characterized by XRD, FTIR and UV–visible spectrophotometer. XRD patterns confirmed the wurtzite formation of doped and undoped ZnO nanopowders. The average crystallite sizes of the prepared samples found from XRD were 19 nm for undoped ZnO, from 17 to 22 nm for Ni-ZnO and from 19 to 26 nm for Ag-ZnO. The average crystallite size of Ag-ZnO increased with increasing Ag contents. Different optical properties of Ni-ZnO and Ag-ZnO nanopowders were observed for different Ni and Ag content. The band gaps of Ni-ZnO and Ag-ZnO nanopowders were lower than that of the undoped ZnO (3.1 eV). The band gaps of Ag-ZnO were lower than that of Ni-ZnO. The optical properties of ZnO were enhanced by Ni (mol.%) in the UV region and by Ag (3 and 5 mol.%) in the visible region.

Fabrication of zinc oxide‐coated microcrystalline cellulose and its application in truck tire tread compounds

“…54 Typically, the characteristic peaks at 31.8, 34.5, 36.3, 47.6, 56.7, 63.0, 68.0, and 69.3 belong to the Miller indices of (1 0 0), (0 0 2), (1 0 1), (1 0 2), (1 1 0), (1 0 3), (1 1 2), and (2 0 1) planes, respectively. 55 The XRD pattern of MCC displays the characteristic peaks of cellulose at 15.3, 16.4, 22.6, and 34.8 2θ which are in accordance with the crystallographic planes of (1 À1 0), (1 1 0), (2 0 0) and (0 0 4) of the cellulose I structure, respectively. [56][57][58][59][60] As expected, the XRD pattern of M-ZnO shows the combined characteristic peaks of both A-ZnO and MCC indicating the existence of ZnO in the M-ZnO sample.…”

“…36‐1451, indicating the hexagonal wurtzite structure of A‐ZnO 54 . Typically, the characteristic peaks at 31.8, 34.5, 36.3, 47.6, 56.7, 63.0, 68.0, and 69.3° belong to the Miller indices of (1 0 0), (0 0 2), (1 0 1), (1 0 2), (1 1 0), (1 0 3), (1 1 2), and (2 0 1) planes, respectively 55 . The XRD pattern of MCC displays the characteristic peaks of cellulose at 15.3, 16.4, 22.6, and 34.8° 2 θ which are in accordance with the crystallographic planes of (1 −1 0), (1 1 0), (2 0 0) and (0 0 4) of the cellulose I structure, respectively 56–60 .…”

Enhancing the Efficiency of Dye‐Sensitized Solar Cells (DSSCs) by Nanostructured Ag‐doped ZnO Electrodes

“…[38] The intensity of (111), and (200) peaks confirmed the formation of Ag in ZnO crystal ChemistrySelect lattice (JCPSD card no 04-0783). [39] Figure S2 illustrates the XRD pattern from 30°to 37.2°. It is clearly shown that the Zn peaks which are corresponding to Miller indices (100), (002), and (101), are slightly shifted to a higher angle side with increasing Ag doping concentration from 0 % to 20 %.…”

Substrate critical effect on the structural and H2Gas sensing characteristics of solution-processed Zn0.075Cu0.025O films

“…As seen, c/a ratio of all samples (table 2) is smaller than ideal which might be linked to the presence of oxygen vacancies V O and extended defects [30]. The average crystallite sizes of the films were estimated using Debye Scherrer's formula, also the microstrain and dislocation density was computed by below equations [31][32][33];…”