Papers by Author: Lu Sheng Chen

Abstract: In this work, samarium and antimony (Sm–Sb) codoped tin oxide (SnO₂) films have been successfully prepared on titanium (Ti) substrate by a facile sol gel method. The samples were characterized by X–ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The composite film materials were used as anode for the electro-degradation of methyl orange solution. Two effective factors of electro–catalytic properties namely, the content of Sm in the SnO₂ samples and the calcination temperature, have been optimized based on the electro-degradation experiments. A moderately calcination temperature of 873 K and 1.0% Sm doping owned the best performance. The smaller grain sizes and optical band gap of the SnO₂ by introduction of the Sm improved electro-catalytic activity.

Abstract: In this work, ZnO–Cu2O/graphene oxide (GO) composites have been synthesized by using simple hydrothermal method. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the crystal structure and composite elements. The photocatalytic activity of the composites has been conducted by measuring the degradation of indigo carmine under UV irradiation. When the atom ratio of Zn/Cu is 5/2, 120 °C of hydrothermal synthesis temperature and 20 h of synthesis time, the ZnO/Cu2O/GO composite exhibits good photocatalytic activity with 96.5% degradation rate of indigo carmine aqueous solution under 500 W high pressure Hg lamp irradiation for 240 min.

Abstract: In this work, F-Sb codoped SnO₂ film electrode material has been prepared and used as an anode on titanium (Ti) substrate for degradation of methyl orange. The emphasis is laid on the effect of univalent cations fluoride doped during preparation of F-Sn codoped SnO₂ composites by sol gel method. The facts show that univalent cations fluoride could affects the electro-catalytic degradation rate of methyl orange by F-Sb codoped composite film on the Ti electrode. A promotion to the degradation rates of methyl orange could be observed when KF or NH₄F was used as codopant but other fluoride codopant such as LiF, NaF or HF could slow the methyl orange degradation. X-ray diffraction (XRD) and x-ray photo-electron spectroscopy (XPS) were used to study structures and composition of the anode surface.

Abstract: The pulsed current of rectangular wave was used to electrolyzing zinc nitrate aqueous solution for the purpose of preparation of a transparent zinc oxide (ZnO) film by cathodic deposition. The current density of rectangular wave was 0.2 and 1.0 mA/cm² , respectively. The former plays a role to deposit homogenous ZnO particles on the substrate surface and the latter plays the role to promote further growth of the particles and film formation. The structural and optical characterizations of the deposited films were performed with x-ray diffraction, scanning electron microscope, and measurements of optical absorption in UV-vis range. Similar technique has been used to modify as prepared porous silicon, resulting a green photoluminescence after 1 h annealing at 1273 K under oxygen atomsphere.