Preparation And Properties Of Low Dimensional Nanostructures Doped Based CdS

In this thesis, solvothermal method was used to synthesize CdS nanomaterials,focusing on the influence of transition metal elements(Cu and Mn) doping to the structure, morphology and optical properties of CdS. The main work includes:(1)Solvothermal synthesis was used to synthesize Cd0.925Cu0.075 S nanostructures and two important experimental parameters, reaction temperature and reaction time, were also studied. It was found that the crystallization of the product obtained was well and the morphology was the reunion of nanorods(about 50 nm in diameter after 24 h under180℃). To all samples, there was a light absorption band in the wavelength of 350 nm to 500 nm range, and the samples obtained under 24 h, 180℃ owned the strongest light absorption ability and the narrowest forbidden band width. These samples obtained two band edge emission peaks at about 470 nm and 525 nm, respectively.(2)Cd1-xCuxS(x=0, 0.05, 0.075 and 0.1) nanostructures have been synthesized using solvothermal synthesis at 180℃ under 24 h. The XRD results indicated that all the samples were pure phase of hexagonal wurtzite structure and the crystallinity of Cu doping sample was better. When Cu doping concentration was 7.5%, the morphology was of the reunion of nanorods(about 50 nm in diameter). Compared with the pure samples, Cu doped samples had better light absorption capability and narrower band gap. In addition, PL results also showed that the samples had two band edge emission peaks.(3) Using solvothermal synthesis(180 ℃, 24h) synthesized Cd1-x MnxS nanometer crystallite, and studied the phase and optical properties of the samples. It was found that the morphology of the doped samples was obviously improved than pure sample(from irregular to regular). All the obtained samples corresponding to PDF CARDS(JCPDS Card No. 65-3414) were pure hexagonal wurtzite structure CdS.Compared with pure sample, the light absorption ability of doped samples was increased, but the forbidden band width was unchanged basically. In addition, the doped samples had obviously blue shift trend, which can be attributed to the transitionemission of Mn2+.Through the analysis of the experimental parameters, it was concluded that the optimum reaction temperature and best response time of solvent thermal synthesis Cu doped CdS nanostructures were 180 ℃ and 24 h. And the optimal Cu doping concentration is 7.5%.