用甲苯-水两相体系制备CdS量子点

Synthesis of CdS Quatum Dots via a Toluene-water Two-phase Approach

为了能够制备出性能良好的CdS量子点,采用两相体系,用温和易控的方法,合成了不同粒径的CdS半导体量子点.用X线粉末衍射（XRD）、透射电子显微镜（TEM）、荧光光谱仪等测试手段对产物进行了表征.结果表明：合成的CdS量子点粒径均匀,为立方晶型,具有良好荧光特性,通过控制反应时间可以控制CdS量子点的粒径,而且可以有效减少晶体的表面缺陷,提高荧光强度,从而进一步应用在光电、催化、传感、生物等领域.

To prepare a good performance CdS quantum dots（QDs）,synthesis of different size CdS semiconductor quantum via a two-phase approach was performed.The two-phase approach means that a solution of CdOA and oleic acid（OA） in toluene and a solution of thiourea in water,the CdS nanocrystals grew at the liquid-liquid interface.X-ray powder diffraction（XRD）,transmission electron microscopy（TEM） technique,fluorescence spectrometer and so on were used to analyze the as-synthesized QDs crystal.As a result,the CdS QDs with narrow sized distribution were cubic structure and had good optical property.Controlling reaction times could synthesize CdS QDs with different sizes and reduce the surface defect,improve the fluorescence intensity：This approach is mild and controllable,and it can be further used in optoelectronics,catalysis,sensing,biological,and other areas.