Kartik H. Patel; Sushant K. Rawal
Abstract
This paper is aimed to explore structural, optical and wettability aspects of zinc oxide (ZnO) nanostructured thin films prepared by radio frequency (RF) magnetron sputtering from a zinc target using gas mixtures of helium and oxygen. The increase of deposition time from 40 to 110 minutes improves evolution ...
Read More
This paper is aimed to explore structural, optical and wettability aspects of zinc oxide (ZnO) nanostructured thin films prepared by radio frequency (RF) magnetron sputtering from a zinc target using gas mixtures of helium and oxygen. The increase of deposition time from 40 to 110 minutes improves evolution of (100), (002) and (110) peaks for ZnO films whereas its (101) peak is evident at deposition time of 110 minutes. At sputtering pressure of 0.5Pa only (100) and (110) peaks are observed. The crystallinity of ZnO films decreases as the sputtering pressure is increased from 0.5 to 8.0Pa. The average crystallite size of films increases from 14nm to 18nm when deposition time is increased from 40 to 110 minutes and from 11nm to 17nm when deposition pressure is raised from 0.5Pa to 8.0Pa. We have studied wettability of water and ethylene glycol for deposited nanostructured ZnO films. The maximum value of contact angle; transmission and energy band gap were 106˚, 87% and 3.27eV respectively for deposited nanostructured thin films.
R. Tholkappiyan; Fathalla Hamed; K. Vishista
Abstract
Lanthanum (La3+) ion doped zinc ferrite nanoparticles were synthesized by combustion method using glycine as fuel. The as-synthesized ZnFe1.96La0.04O4 nanoparticles were subjected to annealing temperature of 900 oC for time intervals of 2 h, 6 h, 12 h, 24 h and 48 h. The as-synthesized and annealed ZnFe1.96La0.04O4 nanoparticles ...
Read More
Lanthanum (La3+) ion doped zinc ferrite nanoparticles were synthesized by combustion method using glycine as fuel. The as-synthesized ZnFe1.96La0.04O4 nanoparticles were subjected to annealing temperature of 900 oC for time intervals of 2 h, 6 h, 12 h, 24 h and 48 h. The as-synthesized and annealed ZnFe1.96La0.04O4 nanoparticles were characterized as a single phase with normal spinel structure. The surface morphology of these nanoparticles were found to be non–uniform and agglomerated with fine pores/voids. The induced strain and dislocation density were reduced with increasing annealing time which enhanced crystallinity and increased grain size. The values of optical band gap calculated from UV/Vis/NIR spectra of the as-synthesized and annealed ZnFe1.96La0.04O4 nanoparticles were found to decrease with increasing annealing time. They range from 2.48 to 2.19 eV from the simple method and 2.42–2.12 eV for direct and 1.87–1.71 eV for indirect from Kubelka–Munk function method. The optical band gap in ZnFe1.96La0.04O4 nanoparticles can be tuned as function of varying annealing time and it seems to correlate with induced strains in the nano-crystallites. Therefore, the tuning of optical band gap with just changing the heating treatment of ZnFe1.96La0.04O4 nanoparticles may make them suitable photocatalysis.
Suresh Sagadevan; Jiban Podder;Isha Das
Abstract
Lead selenide (PbSe) thin films were processed by chemical bath deposition (CBD) technique. To analyze the structure and the crystallite size of PbSe thin film X-ray diffraction (XRD) analysis was used. Using Scanning Electron Microscopy (SEM) the surface examination of the film was conducted. With the ...
Read More
Lead selenide (PbSe) thin films were processed by chemical bath deposition (CBD) technique. To analyze the structure and the crystallite size of PbSe thin film X-ray diffraction (XRD) analysis was used. Using Scanning Electron Microscopy (SEM) the surface examination of the film was conducted. With the help of UV-visible absorption spectrum investigation of the optical properties were held. All the optical constants were determined from UV-visible absorption spectrum. The dielectric examination of PbSe thin films were analyzed for various frequencies and various temperatures. The AC electrical conductivity analysis brought to light that the conduction depended on both the frequency and the temperature. Photoconductivity analysis was carried out to the PbSe thin films.
