Preparation and investigations of magnetic electrical and high pressure studies on pure and transition metal doped TiO2 CuO and NiO nanoparticles

Abstract

Nanomaterials are generally defined as those materials that have a characteristic length scale smaller than 100 nm (1 nm= 10 9 m). In recent years, many studies have been focused on reducing the size of semiconductors to the nanoscale regime, led to a fascinating class of novel materials that possess characteristic between bulk and molecular descriptions. This review involves the preparation, structural, morphological, optical, magnetic, electrical and high pressure electrical resistivity characterizations of semiconducting nanoparticles as functions of dopants, dopant percentage, temperature and pressure. Chapter 1 describes the significance of nanoscaled materials and their unique properties. Chapter 2 summarizes the most common type of instrumentation and characterization techniques. Chapter 3 details the preparation and investigations of magnetic, electrical and high pressure electrical resistivity studies on transition metal (Co, Ni and Cu) doped TiO2 nanoparticles. Chapter 4 summarizes the preparation and investigations of magnetic, electrical and high pressure electrical resistivity studies on copper oxide (CuO) nanoparticles. Chapter 5 summarizes preparation and investigations of magnetic, electrical and high pressure electrical resistivity studies on NiO nanoparticles. NiO nanoparticles were prepared through the novel precipitation method. An analysis of the conducting mechanism of NiO revealed that, and#963;ac varies conspicuously with temperature dependence. High pressure electrical resistivity with two different particle size of NiO results the continuous drop of resistivity at lower pressure region and it showed a nearly constant value at above 5 GPa. In conclusion, the absence of abrupt increase in electrical resistivity could infer the scarcity of structural disorder or any other phase transition. Finally, Chapter 6 presents the summary of the present investigations and suggestions for future work. newline