Abdelghany A M, Abdelrazek E M, Rashad D S
Spectroscopy Department, Physics Division, National Research Center, 12311 Giza, Egypt.
Physics Department, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Sep 15;130:302-8. doi: 10.1016/j.saa.2014.04.049. Epub 2014 Apr 21.
Cadmium sulfide nanoparticles filled polyvinyl pyrrolidone (PVP) were prepared by in situ wet chemical precipitation technique. X-ray diffraction (XRD), Fourier transforms infrared spectra (FTIR), transmission electron microscopy (TEM) and ultraviolet-visible (UV/Vis) were used to characterize the prepared nano-composites. Density Function Theory (DFT) was used to approve the complexation process. XRD results indicate appearance of two peaks at about 28.1°, 27.4° corresponds to (101) and (002) planes which suggest hexagonal phase of CdS with lattice constants of 4.14, 6.72 Å in the polymeric matrix. UV/Vis spectra reveal that nano-composite films show quantum confinement effect. The absorption showed a shift toward the shorter wavelength (blue shift) with decrease in the concentration of Cd+ ions. Optical band gap and particle size were calculated and is in agreement with the results obtained from TEM data. Transmission electron microscopy shows that the prepared CdS nanoparticles were dispersed and nearly uniform in diameter within the polymeric matrix.
采用原位湿化学沉淀技术制备了填充有硫化镉纳米粒子的聚乙烯吡咯烷酮（PVP）。利用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）和紫外可见光谱（UV/Vis）对制备的纳米复合材料进行了表征。采用密度泛函理论（DFT）来验证络合过程。XRD结果表明，在约28.1°、27.4°处出现两个峰，分别对应于（101）和（002）平面，这表明在聚合物基体中CdS为六方相，晶格常数为4.14、6.72 Å。UV/Vis光谱表明纳米复合薄膜呈现量子限域效应。随着Cd²⁺离子浓度的降低，吸收峰向较短波长方向移动（蓝移）。计算了光学带隙和粒径，其结果与TEM数据所得结果一致。透射电子显微镜显示，制备的CdS纳米粒子在聚合物基体中分散且直径几乎均匀。
