氢氧根辅助氧化亚铜的形貌控制合成及其性质研究

采用简单的室温液相还原法,通过调节OH-的浓度,成功合成了Cu2O纳米颗粒和微米立方块.利用XRD、FT-IR、SEM等手段对产物进行了表征.研究了OH-浓度对Cu2O{100}面生长情况的影响,并探讨了两种形貌Cu2O的形成机理.利用固体紫外可见光谱测得不同形貌Cu2O的带隙能,微米立方块状Cu2O的带隙能小于纳米小颗粒的带隙能.研究了两种不同形貌的Cu2O的光催化降解甲基橙的性能,Cu2O微米立方块和Cu2O纳米颗粒对甲基橙的降解率分别为98.1%和71.4%,前者的光催化效果明显高于后者.光致发光光谱分析表明,Cu2O微米立方块的光致发光光谱强度较低,具有低的电子-空穴对复合率和高的电子-空穴对分离度.此外,还对Cu2O的抑菌性能进行了初步研究.

Controlled synthesis and properties of cuprous oxide by simply altering OH-concentration

Cuprous oxide(Cu2O) nanoparticles and microcubes have been successfully fabricated by reduce of CuSO4 with ascorbic acid at room temperature.The synthetic procedure for Cu2O is simple and easy,without template or surfactant introduced.It suggested that OH-have effects on stability of {100} which lead to morphology of cubic.All of the samples were characterized by X-ray powder diffractometer(XRD),scanning electron microscopy(SEM) and fourier transform infrared spectrometer(FT-IR).The band gaps of as-prepared products were determined by UV-vis absorption spectra.The photocatalytic activities of as-synthesized Cu2O nanoparticles and microcubes for dyes were studied.It was found that Cu2O microcubes exhibited higher photocatalytic activity on photodegradation of methyl orange by visible light and the photocatalytic degradation ratio reached to 98.1%.The intensity of photoluminescence spectrum of Cu2O microcubes was lower,which indicated the recombination of electron-hole pairs is difficult and the separation of electron-hole pairs is easier.Moreover,the inhibiting bacteria growth behaviors of as-prepared Cu2O were observed.