The growth of ZNO NANOWIRES as a function of the thickness of Au thin layers, deposition temprature and surface properties through simple carbothermal evaporation method is studied. Investigations by X-ray diffraction (XRD) revealed the (002) plane as the preferred plane for the growth of ZNO NANOWIRES. Our experiments indicated that the temperature range of 800-900°C under flow of 100 sccm N2 gas with Au catalyst layer, is the suitable condition for producing the most aligned NANOWIRES. The Vepour – Liquid - Solid (VLS) mechanism more than other mechanisms is dominant for growth process.

In this work, on the basis of density functional theory and the generalized gradient approximation (GGA) we optimized the electronic structure of the unsaturated and hydrogen saturated ZNO NANOWIRES with [0001] orientation. Studying the effects of a uniaxial strain on the NANOWIRES, we calculated the Young’s modulus and the effective piezoelectric coefficient of the NANOWIRES. Furthermore, the effect of this uniaxial strain on the imaginary part of dielectric function of the NANOWIRES was investigated.

Background and Objective: In recent years the incidence opportunistic fungual infections has in creased dramatically. One of the most common fungal pathogen Candida dubliniensis, colonization and biofilm formation on the surfaces of medical devices. The aim of this study was to evaluate the inhibitory activity of zinc oxide nanoparticles against C. dubliniensis biofilm formation by the MTT colorimetric method is measured.Materials and Methods: In this study, ZNO nanoparicles using the sol-gel was prepared, size and type of particles, respectively, by scanning electron microscopy (SEM) and X-Ray-Diffraction were determined. The Minimum inhibitory concentration (MIC) of growth dilution method was done by microdilution test.C. dubliensis biofilms (DSY 1024) after 48h incubation at 37oC inhibited the information of nanoparticles ZNO, SDS and Fluconazole drug as a positive control on Candida biofilms was assessed by MTT tetrasolium salt reduction. The collected data using statistical t-test and SPSS software were analyzed.Results: The results of this study showed that a minimum concentration of inhibitor nanoparticles, ZNO, SDS and fluconazole, respectively: 9.25, 0.02, 8 mg/ml. Inhibitory strength of biofilm adhesion in the presence of nanoparticles ZNO, SDS and fluconazole, equivalent to more than twice the concentration of the MIC was determined.Conclusion: In this study, ZNO nanoparticles synthesized by a chemical method indicat that has anti-fungal properties. Therefore, a new way of working for the prevention of biofilm formation of Candida biofilms particularly associated with medical devices to be.

ZNO NANOWIRES with a diameter of 70 nm and nanorods with a diameter in the range of 100-150 nm and two micrometer in length were grown on glass substrates by resistive evaporation method and applying a two-step oxidation process at low temperatures, without using any catalyst, template or buffer layer. The XRD pattern of these nanostructures indicated a good crystallinity property with wurtzite hexagonal structure. Photoluminescence measurement revealed three band emissions; one sharp strong peak in the UV region and two weaker peaks in the visible region, indicate good optical properties of nanorods synthesized by this method. Heat treatment in oxygen-rich atmosphere results to decrease of deep-level emission intensity in the PL spectra. The relatively high intensity of UV emission implies that this approach is a simple and promising method for fabricating ZNO nanorods in order to be used in optoelectronic devices especially in the UV range of the spectrum.

Highly ordered anodic alumina template was produced by hard anodization. Barrier layer thickness was then reduced by a thinning process, and in the following Zn NANOWIRES, it was grown in pores by periodic (AC) and pulsed electrochemical deposition. The samples were placed in a furnace for oxidation and for the possible preparation of electrical resistors. By measuring the electrical resistance of nanowire arrays, we did the calculations to find the electrical resistivity of each ZNO nanowire.