Monodispersive CoPt Nanoparticles Synthesized Using Chemical Reduction Method

Monodispersive CoPt nanopaxticles in sizes of about 2.2 nm axe synthesized by superhydride reduction of COCl2 and PtCl2 in diphenyl ether. The as-prepared nanoparticles show a chemically disordered Al structure and axe superpaxamagnetic. Thermal annealing transforms the Al structure into chemically ordered Llo structure and the particles are ferromagnetic at room temperature.     

Controlled growth of large＇scale silver nanowires

Large-scale silver nanowires with controlled aspect ratio were synthesized via reducing silver nitrate with 1, 2- propanediol in the presence of poly （vinyl pyrrolidone） （PVP）. Scanning electron microscopy, transmission electron microscopy and x-ray powder diffraction were employed to characterize these silver nanowires. The diameter of the silver nanowires can be readily controlled in the range of 100 to 400 nm by varying the experimental conditions. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy results show that there exists no chemical bond between the silver and the nitrogen atoms. The interaction between PVP and silver nanowires is mainly through the oxygen atom in the carbonyl group.     

高温热解法制备硒化镉纳米晶

以脂肪酸和三辛基氧化膦为表面活性剂,采用高温热解硒与镉的前聚体,制备出分散性好的CdSe纳米晶.吸收光谱和荧光光谱研究表明,控制反应时间可以改变CdSe纳米晶的荧光强度.     

CdS纳米棒的制备、表征及其形成机理

以三辛基膦(TOP)为单一配位溶剂,二水合乙酸镉和硫粉为前驱体,用高温热解的方法制备CdS纳米棒.通过X射线衍射(XRD)、透射电镜(TEM)、高分辨透射电镜(HRTEM)、紫外-可见(UV-Vis)分光光度计、荧光(PL)光谱、傅里叶变换红外(FTIR)光谱和核磁共振磷谱(31PNMR)等方法对样品的结构、形貌和光学特性进行了表征.考察了前驱体Cd/S摩尔比和反应物浓度对硫化镉纳米结构的影响.实验结果表明,该法制备的CdS纳米棒为纤锌矿结构,直径为4.0nm,长度为28.0nm,沿[001]方向择优生长,具有量子限域效应.同时,对CdS纳米晶的形成机理进行了初步的探讨.