微波水热法制备CdS单分散纳米球及其形貌控制  

Preparation and Morphology Controlling of Monodisperse CdS Nanospheres by Microwave Hydrothermal Process

作　　者：张钦峰[1] 黄剑锋[1] 曹丽云[1] 胡宝云[2] 吴建鹏[1] 张永亮[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021 [2]同济大学材料科学与工程学院,上海201804

出　　处：《无机化学学报》2013年第2期271-276,共6页Chinese Journal of Inorganic Chemistry

基　　金：陕西省国际科技合作重点项目(No.2011KW-11);陕西省教育厅自然科学专项基金(No.2010JK444);陕西省自然科学基金(No.2010JM6001)资助项目

摘　　要：采用微波水热法,以醋酸镉(Cd(CH3COO)2.2H2O)为镉源,硫脲(CS(NH2)2)为硫源,制备出了具有单分散球形形貌的CdS纳米晶。应用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)、能量色散谱仪(EDS)、高分辨透射电子显微镜(HR-TEM)、紫外可见吸收光谱(UV-Vis)等测试手段对样品的物相、形貌、元素组分及吸光性能进行了表征,并以罗丹明B溶液的降解脱色反应来考察了其的光催化活性。结果表明:随着S/Cd物质的量比(nS/nCd)逐渐增大,产物会出现由刺球链状向分散球形过渡的规律性变化。在一定的nS/nCd比的条件下可以合成出大小均匀、分散性较好的六方相CdS纳米球。样品对可见光有较强吸收,存在着一定的红移现象。在可见光照射下,硫化镉单分散纳米球具有更高的光催化活性。Monodisperse CdS nanospheres were successfully prepared by microwave hydrothermal process using cadmium acetate [Cd（CH3COO）2·2H2O] and thiourea [CS（NH2）2] as the source material. The phase composition, morphologies and elemental constitution of the product were characterized by X-ray diffraction （XRD）, scanning electron microscopy （FE-SEM）, electron energy dispersive spectrometer （EDS） and transmission electron microscopy （TEM）. Ultraviolet-visible （UV-Vis） was used to investigate the optical property of the CdS nanocrystallines whereas catalytic activity was evaluated by the photocatalytic degradation to rhodamine B （RB） reaction. The results indicated that the morphology of prepared CdS transforms regularly from acanthosphere-like chain-shaped structure to monodisperse sphere with the increase of S/Cd molar ratio. Hexagonal CdS nanospheres with good uniformity and dispersibility can be prepared at certain ns/ncd molar range. The samples had a relatively strong absorption at visible region with a obvious red shift comparing to the common bulky CdS particles. The monodisperse CdS nanospheres had higher catalytic activity under visible light irradiation.

关 键 词：微波水热法 CDS 单分散 纳米球 S Cd物质的量比 

分 类 号：TQ132.44[化学工程—无机化工]