Effect of Annealing on Structural, Morphological, Electrical and Optical Studies of Nickel Oxide Thin Films

Abstract

Sol gel spin coating method has been successfully employed for the deposition of nanocrystalline nickel oxide (NiO) thin films. The films were annealed at 400°C - 700°C for 1 h in an air and changes in the structural, morphological, electrical and optical properties were studied. The structural properties of nickel oxide films were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis shows that all the films are crystallized in the cubic phase and present a random orientation. Surface morphology of the nickel oxide film consists of nanocrystalline grains with uniform coverage of the substrate surface with randomly oriented morphology. The electrical conductivity showed the semiconducting nature with room temperature electrical conductivity increased from 10<sup>-4</sup> to 10<sup>-2</sup>(Ωcm)<sup>-1</sup> after annealing. The decrease in the band gap energy from 3.86 to 3.47 eV was observed after annealing NiO films from 400<sup>o</sup>C - 700<sup>o</sup>C. These mean that the optical quality of NiO films is improved by annealing

Study of Optical and Electrical Properties of Nickel Oxide (NiO) Thin Films Deposited by Using a Spray Pyrolysis Technique

“…By comparing the XRD pattern with the JCPDS data, it was found that the product is nickel oxide (JCPDS file no: 73-1519). Also The prepared film, which agrees with that in the literatures P. S. Patil and L. D. Kadam, (2002) [21] V. Patil, et al (2011) [22] H. L. [23] and I. Fasaki, et al [24]. The diffragram of the new film shows one pronounced diffraction peaks, (111) appear at 2θ = 28.001˚.…”

“…The band gap energy values are found to be 3.3 eV. Our result is in good agreement with S. A. Mahmoud, et al (2011) [18], P. S. Patil and L. D. Kadam, (2002) [21] and V. Patil, et al (2011)[22].…”

Nickel oxide nanoparticles film produced by dead biomass of filamentous fungus

“…The metal oxide can assume a variety of structural geometries with an electronic structure that can exhibit metallic and semiconductor characteristics, conferring different chemical and physical properties1.…”

Electrochemical energy-storage performances of nickel oxide films prepared by a sparking method

“…The performances of NiO-based electrochemical energy-storage devices are related to its structural, chemical and electrical properties, which depend considerably on the preparation method. NiO has been synthesized by a variety of chemical and 35 physical approaches 14,15,[17][18][19][20][21][22] . Chemical methods including chemical bath deposition, electrodeposition, chemical precipitation, spray pyrolysis, hydrothermal process and sol gel process usually generate harmful chemical wastes or excess chemical impurities, which come from the chemical precursors or 40 other chemical agents used in the processes.…”

“…It should be noted that the sparking 30 process parameters were chosen based on the previous studies reported by our group 27 , which showed that higher sparking voltage could produce smaller average particle size. In particular, the maximum sparking voltage (3.0 kV) and sample sliding speed (1 cm/min) of the sparking machine were selected to 35 obtain uniform sparked films with very fine nanometer-sized particles and high porosity. The mass of sparked NiO films was measured by high-precision microbalance with 6 digit resolution (M5P, Sartorius).…”