【作者】 焦永峰；

【导师】 彭同江；

【作者基本信息】 西南科技大学 ， 材料物理与化学， 2006， 硕士

【摘要】 对天然纤蛇纹石的矿物学特征进行了研究，首次采用电化学法在天然纤蛇纹石纳米管内组装了半导体CdS量子点。人工合成了纤蛇纹石，对照天然纤蛇纹石对人造纤蛇纹石的晶体结构及矿物学特征进行了较系统地研究。首次采用超声化学法分别对天然纤蛇纹石和人造纤蛇纹石进行了组装CdS和ZnS量子点的实验，并对组装的样品进行了一系列的测试与研究。研究结果认为：电化学沉积法的组装率较低，约1％。人造纤蛇纹石纳米管内径(约10nm)比天然纤蛇纹石纳米管(约5nm)大，平均长度约150nm，端口开放。超声化学法较电化学法组装率高，人造纤蛇纹石较天然纤蛇纹石的组装率高，最高的组装率可达30％以上。组装在纤蛇纹石纳米管内的CdS和ZnS量子点均为β型立方晶系，平均晶粒度约4nm。由于量子限域效应和纤蛇纹石引起的介电限域效应的综合影响，CdS和ZnS量子点的光吸收分别出现不同程度的蓝移和红移现象。最后，对电化学法及超声化学法的组装机理进行了阐述。更多还原

【Abstract】 Mineralogical characteristics of inartificial chrysotile nano-tubes were researched. And then, electrochemistry-method was adopted for the first time to assemble CdS quantum-dots in it. Artificial chrysotile was composed, and its crystal structure and mineralogical charters were inextenso researched compare with inartificial chrysotile. CdS and ZnS quantum-dots were assembled in inartificial and artificial chrysotile nano-tubes by ultrasonic chemistry-method for the first time, respectively, and the assembled samples underwent a series of testing and researches. The research results are as below. The assemble ratio of Electrochemistry-method was about 1%. Nano-tubes diameter of artificial chrysotile (-10nm) was lager than that of inartificial chrysotile (-5nm), their average length was 150nm and tubes were unclosed. Assemble rations of ultrasonic chemistry-method were lager than that of electrochemistry-method, and the ratios of artificial chrysotile were larger than that of inartificial chrysotile, the ration of artificial chrysotile adopted ultrasonic-method even reached more than 30% at best. The assembled CdS and ZnS quantum-dots were all β kind with cubic structure, and the average crystal granularity were round about 4nm. Due to the quantum confinement effect and the dielectric confinement effect which caused by large difference between permittivity of the semiconductor quantum-dots and chrysotile, a certain extent red shift and blue shift were appeared in assembled CdS and ZnS quantum-dots. At last, the assemble mechanisms of electrochemistry-method and ultrasonic chemistry-method were discussed.更多还原