Fabrication Of One Dimensional Metal Oxide Nanomaterials By Pulsed Laser Deposition And Their Properties

One-dimensional metal-oxide nanomaterials have attracted much attention because metal oxides are the most fascinating functional materials. The1D morphologies can easily enhance the unique properties of the metal-oxide nanostructures, which make them suitable for a wide variety of applications, including Low-loss Transmission, quantum computer, high-density digital recorder, field emitters, supercapacitors, and Spin-electron device. Therefore, various physical and chemical deposition techniques and growth mechanisms are exploited and developed to control the morphology, identical shape, uniform size, perfect crystalline structure, defects, and homogenous stoichiometry of the1D metal-oxide nanostructures.Pulsed laser ablation is a simple, but versatile, experimental method that finds use as a means of patterning a very diverse range of materials, and in wide areas of thin film deposition and multi-layer research. Firstly, the output of a pulsed laser is focused onto a target material maintained in a vacuum, which induces extremely rapid heating of a significant mass of target material. Then the materials start to boil off and expand into the gas phase. Thus, unless one is working with very short duration laser pulses, the ensuing plume of ejecta will be irradiated by the later part of the incident laser pulse. This radiation will, in many cases, be absorbed by the plume, which now consists of an ensemble of neutral and charged material, carrying varying levels of residual (and time decaying) excitation, will continue to expand away from the interaction volume. Its distribution is generally symmetric about the target surface normal. For PLD, the ejected flux is arranged to impinge on the substrate of interest, and film deposition occurs.Here we show that PLD method prepared Zinc Oxide nanorods and Tungsten Oxide nanorods on a range of substrates (Silicon, tungsten, tantalum and copper), and explore the dependence of such depositions to process conditions like substrate temperature, O2pressure and incident fluence. The morphology and microstructure of the products were characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), High resolution translation electron microscopy (HRTEM), selected area electron diffraction (SAED), Raman spectrum measurements (RS), X-ray photoelectron spectroscopy (XPS), Photoluminescence (PL), Field electron emission (FEE). The results show that WOx NRs were successfully deposited on each of the chosen substrates, but surface and microstructural analysis highlights the sensitivity of the crystallinity and morphology to process conditions; the favored phase was different for each substrate.Besides, Cadmium vanadium oxides (Cd2V2O7) and Cadmium carbonate (CdCO3) polycrystal micro-particles were successfully synthesized via a facile hydrothermal method. X-ray diffraction pattern of the sample are in agreement with the standard pattern of the monoclinic Cd2V2O7and rhombohedral CdCO3. High resolution transmission electron microscope (HRTEM) and selected areal electron diffraction (SAED) results suggest the polycrystalline characteristic of the particles. The as-synthesized sample was characterized by Raman spectrum and X-ray photoelectron spectroscopy (XPS). The optical band gap was evaluated by extrapolating the linear portion of the reflection curve of ultraviolet-visible reflection spectrum (UV-Vis). Furthermore, novel visible light emissions were exhibited via room temperature photoluminescence (PL) measurement.