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Studies on rheological, structural, optical, electrical and surface properties of LiMn2O4 thin films by varied spin rates

Balakrishnan T., Subramanian N. S., Kathalingam A.

Materials Science Poland

2017

Vol. 35, No. 3

626--631

LiMn2O4 thin films prepared by cost-effective spin coating method using optimized coating conditions are reported. Spin rate was varied and spin rate dependent properties were studied. Prepared films were characterized for their structural, morphological and optical properties. X-ray diffraction study of LiMn2O4 thin films confirmed the cubic spinel structure with the preferred orientation along (1 1 1) plane. Optical absorption studies showed band gap energy of 3.02 eV for the grown LiMn2O4 films. FT-IR bands assigned to asymmetric stretching modes of MnO6 group were located around 623 cm−1 and 514 cm−1 for the LiMn2O4 thin films. The weak band observed at 437 cm−1 was attributed to the LiO4 tetrahedra. The films showed high conductivity value 0.79 S/cm indicating the generation of effective network of the film for enhanced charge transport. AFM micrographs of the LiMn2O4 films deposited at 3000 rpm and 3500 rpm showed uniform distribution of fine grains throughout the surface without any dark pits, pinholes and cracks.

Chemical bath deposition and characterization of nanocrystalline ZnO thin films

Kathalingam A., Ambika N., Kim M. R., Elanchezhiyan J., Chae Y. S., Rhee J. K.

Materials Science Poland

2010

Vol. 28, No. 2

514--522

The subject of this paper is the wet chemical synthesis and characterization of nanocrystalline ZnO thin films. ZnO thin film was deposited on a zinc plate using a chemical bath of zinc acetate (Zn(O2CCH3)2) and ethylenediamine (C2N2H8) at various temperatures. Different substrates were used and their effect on the chemical bath deposition of ZnO were investigated. The effect of pH levels and temperature on the crystalline quality and morphology of the ZnO film are also presented.