Effect of Mn doping on the structural, photoluminescence and photocatalytic photodegradation properties of Zn1−xMnxO have been studied. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. The samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), photoluminescence and UV-visible (UV-Vis) spectroscopy. XRD analysis showed that Zn1−xMnxO can keep a single phase of wurtzite structure at low Mn doping. UV-Vis spectra of Mn-doped samples showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels.

A suitable deposition method of CdS is necessary for the high performance CIGS(Cu(In0.7Ga0.3)Se2.2) solar cells. In this paper, CdS films were deposited onto glass substrates at the substrate temperture of 50°C、100°C、150°C by thermal evaporation, the effect of the temperature were presented. CdS film deposited at substrate temperture of 150°C was annealed at 150°C for 30min. All films were characterized for their morphology, structure and optical property using scanning electron microscope(SEM), X-ray diffractometer(XRD) and UV–VIS–IR transmittance respectively.The quantum efficiency of the fabricated solar cells with annealed CdS buffer layer was also enhanced at short wavelength. This new method leads to the improved performance of CIGS solar cells and also simplify the whole fabrication technology.

304 stainless steel is an indispensable and widely used material in our modern society. Recent development in the industry requires that the 304 stainless steel be very pure and have exceptionally smooth surfaces which cannot be achieved by traditional machining. The existing electropolishing solution of 304 stainless steel suffers from bad polishing effectiveness, high cost, environmental pollution and so on. In this work, we study the process characteristics of pulsed electrochemical polishing with environmental-friendly solutions in pursuing good polishing effectiveness, high efficiency, no environmental pollution and low cost. Successful attempts have been demonstrated with comparable results as traditional methods. The best recipe in our study includes: H3PO4 is 600ml/L, H2SO4 is 275ml/L, H2O is 125ml/L, polyethyleneglycol is 8-10g/L, glucose is 10-15g/L; and electropolishing for 4-5min at a current density of 50-55A/dm2, a polishing temperature of 55-60°C and a pulse duty ratio of 80%.

304 stainless steel is deemed an indispensable material in the industry. In many instances, the surface of the production equipment needs to be treated for low-corrosion passivation, lower surface roughness, good degree of finish and cleanliness. The process characteristics of pulse electrochemical polishing meet these requirements well. The current study investigates the effects of the major processing parameters on the surface reflectivity and the surface metallography. The electrolyte with 29.4% water content and a ratio between H2SO4and H3PO4of 2 and 4 has been proven to be successful, showing no corrosion pitting points on the specimen surface. The electrolyte temperature of 50~55°C, the pulse duty ratio of 33~50% and the electrical current density of 50 to 55A/dm2are found to be optimal. The addition of 2.4% glycerin and 2.2% glucose provides a very fine surface, surface reflectivity of stainless steel from 18% improve 89%.

We study the effect of Mn doping on the photocatalytic photodegradation properties of Zn1−xMnxO nanomaterials to the methyl orange. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. UV-visible (UV-Vis) spectroscopy was used to examine the radiated and non-radiated samples to study their photocatalytic photodegradation property of the methyl orange. Our results showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels, and there exists an optimum Mn doping (x~0.18) at which photodegradation efficiency is nearly optimized.