电沉积硫化镉纳米膜的形貌和光学性质研究

Morpholody and Optical Properties of Electrodeposited CdS Nanofilm

采用电沉积方法,在表面活性剂/电解液界面制备了硫化镉纳米膜,考察了样品的表观形貌及光学性质。原子力显微镜(AFM)及透射电镜(TEM)测试表明,纳米膜由粒径为33 nm左右的球形颗粒组成;X-射线光电子能谱测试表明,纳米膜由硫化镉和金属镉组成;用椭圆偏振仪测试样品在不同波长下的复折射率、复介电常数,并计算得出硫化镉纳米膜的平均厚度为190 nm;用Z-扫描方法硫化镉纳米膜的非线性折射性质,计算得出硫化镉纳米膜的非线性折射系数为5.06×10-6cm2/kW;荧光光谱测试表明,硫化镉纳米膜具有光致发光性能。

CdS nanofilms were prepared at the interface of surfactants and electrolyte by electrodeposition method. The morphology and optical properties of the CdS nanofilms were investigated. The results of AFM and TEM indicate that the nanofilm compose by globose particles with mean diameter of 33 nm. The results of XPS indicate that the nanofilm consist of Cd and CdS. The complex refractive index and complex permittivity under different wavelength were measured by ellipse polarization, and thickness of the CdS nanofilm is 190 nm. The nonlinear optical property of CdS nanofilm was tested by the method of Z-scan, its nonlinear refraction index is 5.06 × 10-6 cm^2/kW. Photo-emission of the nanoparticles were investigated according to the fluorescence spectra.