Papers by Author: Xiao Qiang Wang

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Authors: Ming Ya Li, Jian Min Wang, Jing Guo, Yue Liu Li, Xiao Qiang Wang
Abstract: Highly Ordered arrays of TiO2 nanotubes on Ti wire were prepared by anodic oxidation with ethylene glycol solution of NH4F electrolyte. The phase compositions of the samples were characterized using X-ray diffraction (XRD) analysis using Cu-Kα radiation. The microstructure was observed using scanning electron microscopy (SEM). Experimental results show that at the anode condition of 95V, 50°C, and then themal treatment at 550°C, the highly ordered anatase TiO2 nanotubes arrays arranged on the surface of Ti wire. The length of the nanotube achieved was about 31μm, the internal diameter and outer diameter of the nanotube was 127nm and 170nm, respectively.
Authors: Xiao Qiang Wang, Jian Min Wang, Jing Guo, Yue Liu Li, Ming Ya Li
Abstract: NH4F with ethylene glycol solution as the electrolyte, the anodic oxidation of titanium mesh surface in preparation of ordered TiO2 nanotube array. The structure, morphology and absorption properties of samples were characterized by XRD, SEM and UV spectrophotometer. The results show that, in a certain time range, nanotube length and diameter will increase with the increase of oxidation time. The best oxidation time is 60min. Ultraviolet visible spectrophotometer results show that, the optical band gap of samples is from 3.26-3.42eV. The photoelectric conversion characteristics of dye sensitized solar cell assembled with prepared nanotube arrays were tested.
Authors: Xiao Qiang Wang, Meng Wang, Xiao Yan Zhu, Ming Ya Li
Abstract: ZrO2 spherical nanoparticles were prepared by rheological phase reaction. The crystal structure, morphology and formation mechanism were characterized with X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR) and scanning electron microscopy (SEM), etc. Then three-dimensional photonic crystal was synthesized by sol-gel method and using surfactant as template. The study showed that well-controlled spherical particle is helpful to preparation of photonic crystal with adjustable apertures. Mesoporous ZrO2 was obtained with narrow pore size distributions.
Authors: Xiao Qiang Wang, Meng Wang, Jian Min Wang, Chun Lei Zha, Cong Mian Zhen
Abstract: In this thesis, highly ordered TiO2 nanotube array films were fabricated via liquid phase depostition (LPD) method, based on different anodized aluminum (AAO) templates. The surface morphology, structure and diffuse reflection spectrum were analyzed by XRD, SEM, UV diffuse reflection spectrum. The results show that the crystal structure of the TiO2 nano array was anatase after heat-treating at 400 °C. SEM photographs show that nanobube arrays have an average diamieter of 50~80nm, the surface morphology is flat, and the tublar structure is not violated after heat-treating. As the growth times increased, red-shift effect was abserved in diffuse reflection spectra. And the optical band gap is respectively 1.48ev, 1.70ev and 2.08ev as the growth time is 10mins, 20 mins and 30mins.
Authors: Xiao Qiang Wang, De Yan He, Jun Shuai Li
Abstract: Si films were deposited by inductively coupled plasma chemical vapor deposition at room temperature with a mixture of SiH4/H2. The microstructure of the film was characterized with Fourier transform of infrared, Raman spectroscopy, atomic force microscopy. We found that SiH4 concentration strongly affects the structure of Si films and nano-crystalline film can be synthesized at room temperature by optimizing the silane concentration. The analysis for optical properties of the films suggested that the optical band gap EOPT of films are distinctively lower than those of amorphous Si films. It has been observed that the EOPT of sample decreases with the increasing of H content in film.
Authors: Xiao Yan Zhu, Xiao Qiang Wang, Jing Guo, Yue Liu Li
Abstract: In this work, titanium films , 500nm thick, are rf sputtered onto glass substrates held at 500°C. The resulting films are then anodized at a constant potential in an electrolyte using a platinum counter electrode. Ti films were synthesized by RF magnetron sputtering on glass substrates. The anodizaton process resulted in the formation of titania nanoarrays. The samples are annealed at different temperature to induce crystallinity. XRD results indicated that the optimal annealing temperature is 500°C, the film is anastasia phases. Atomic force microscope (AFM) show that the microstructure is nanoporous pillar array. The AFM depth is about 21nm. The roughness average (Ra) of films is about 1~3nm. Then the TiO2 nanoarry film is integrated into DSCs structure, and I-V Characteristic of cell is studied preliminarily.
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