摘要
Nanoparticles of pure and Cu/Ag-doped CdS and ZnS have been synthesized via chemical bath deposition without using any capping or toxic reagents.The synthesis was carried out through a simple and less expensive green method.The XRD result shows that both pure CdS and ZnS and their doped derivatives are of high crystalline with hexagonal packing structure.The average crystalline size of all nanoparticles was calculated using Debye-Scherrer formula.The crystalline size of nanoparticles of pure samples varied with that of the doped sample.The average crystalline sizes of all nanoparticles are found to be in the range of 5.5-2.2 nm for CdS（from pure to doped） and 4.3-3.4 nm for ZnS,respectively.The band gap values obtained from UV-visible spectra are in the range of 3.5-2.1 e V for CdS and 3.3-2.7 e V for ZnS derivatives,respectively.The FTIR spectral data give characteristic peaks for Cd—S,Cu—S,Ag—S and Zn—S bonds and confirm the formation of respective nanoparticles.The peaks corresponding to the microstructural formation are also observed.The FE-SEM images show the granular morphological structure for all the samples.The agglomeration size of the samples in the range of 10-50 nm for CdS：Cu and 50-100 nm for ZnS：Cu is observed.
采用化学水浴沉积方法制备纯ZnS、CdS及Cu或Ag掺杂ZnS、CdS纳米颗粒,整个过程没有使用任何覆盖剂和有毒化学试剂。该制备方法是一种简单的低成本绿色合成方法。XRD结果表明,所得纯ZnS、CdS及其掺杂体结晶良好,具有密排六方结构。采用Debye-Scherrer公式计算所有纳米颗粒的平均晶粒尺寸,发现未掺杂纳米颗粒的晶粒尺寸与掺杂样品的晶粒尺寸存在差别。CdS纳米颗粒的晶粒尺寸为5.5~2.2 nm,而ZnS纳米颗粒的晶粒尺寸为4.3~3.4 nm。紫外-可见光谱分析表明,CdS的能带宽为3.5~2.1 e V,ZnS的能带宽为3.3~2.7 e V。FTIR光谱中存在Cd—S、Cu—S、Ag—S和Zn—S的特征峰,表明样品中存在这些纳米颗粒。同时还观察到了与显微组织相应的峰。FE-SEM结果表明,所有样品都具有球状形貌。CdS：Cu和ZnS：Cu纳米粒子发生团聚,其尺寸分别为10~50 nm和50~100 nm。
