Fabrication of Cu_2O@Cu_2O core-shell nanoparticles and conversion to Cu_2O@Cu core-shell nanoparticles in solution

Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive ascorbic acid (AA) in air at room temperature, which was an interesting phenomenon. The features of the two kinds of NPs were characterized by XRD, TEM and extinction spectra. Cu2O@Cu NPs with different shell thicknesses showed wide tunable optical properties for the localized surface plasmon (LSP) in metallic Cu. But Cu2O@Cu2O NPs did not indicate this feature. FTIR results reveal that Cu+ ions on the surface of Cu2O shell coordinate with N and O atoms in PVP and are further reduced to metallic Cu by excessive AA and then form a nucleation site on the surface of Cu2O nanocrystalline. PVP binds onto different sites to proceed with the reduction utill all the Cu sources in Cu2O shell are completely assumed.

Cu2O/ZnO全氧化物薄膜的光电化学性能

本文利用SEM、XRD等多种表征手段证实了一维纳米复合半导体的形成,分析其形貌和结构。以P3HT/Cu2O/ZnO一维纳米复合半导体作为光电极组装全固态氧化物纳米结构太阳电池,研究了Cu2O厚度对组装电池光伏性能、光电性能和光电极光吸收性能的影响。结果表明,组装成的简易全固态氧化物太阳能电池最高可获得0.039%的光电转换效率。