Yongshu Tian

Vertically Aligned TiO2 Nanorod Arrays as a Steady Light Sensor

Vertically aligned TiO 2 nanorods have been prepared directly on Ti foil through a one-step environmentally friendly and template-free solution method. X-ray diffraction, field-emission-scanning electron microscopy, and energy-dispersive X-ray spectroscopy have been employed to characterize the synthesized samples. The control of morphology and size of the TiO 2 nanorods can be achieved by varying the solution concentration, hydrothermal temperature, and synthesis time. The influence of nanorod size on the conductivity has been investigated by electrochemical impedance spectroscopy, and the results indicate that the electrical conductivity of thin nanorod arrays is better than that of thick nanorod arrays. Meanwhile, the electrode based on the thin nanorod arrays has shown a highly sensitive and steady photocurrent response under simulated sunlight and UV illumination, which indicates that the nanorod TiO 2 arrays could be a candidate for use in optoelectronic sensor.

Magnetic and optical properties of Mn doped ZnO nanocrystalline films

We have investigated the properties of Mn-doped ZnO nanocrystalline films grown on zinc foil by hydrothermal method. The microstructure, optical and magnetic properties of these films have been characterized by SEM, XRD, XPS and UV-vis spectrum. The XPS spectra show the doping manganese exists as Mn2+. From UV-vis spectra, the shift in band gap and greater reflectivity can be observed due to Mn doping in ZnO. The magnetic property measurement of the Mn-doped ZnO exhibits a room temperature ferromagnetic characteristic with a saturation magnetization (Ms) of 0.3902×10−3 emu/cm2 and a coercive field of 47 Oe.