利用水相合成的CdTe纳米晶构建超晶格结构研究——纳米晶聚集体的调控  

THE FIRST STEP OF PREPARING SUPPERLATTICE WITH AQUEOUS CdTe NANOCRYSTALS——THE CONTROLLED AGGREGATION OF NANOCRYSTALS

作　　者：王春雷[1] 杨柏[1] 李冬妹[2] 李敏杰[1] 韩坤[1] 张俊虎[1] 

机构地区：[1]吉林大学超分子结构与材料重点实验室,长春130012 [2]吉林大学超硬材料重点实验室,长春130012

出　　处：《高分子学报》2005年第4期594-599,共6页Acta Polymerica Sinica

基　　金：国家重大基础研究课题(项目号2002CB613401);国家自然科学基金(基金号90401020)资助项目

摘　　要：用巯基丙酸作稳定剂,在水溶液中制备了CdTe纳米晶.通过加入Cd2+、聚丙烯酸(PAA)以及长期放置分别得到了CdTe纳米晶的聚集体,改变Cd2+浓度或PAA加入量可以调控聚集体的尺寸.过量的Cd2+加速了聚集体的形成,通过与纳米晶表面羧酸根的静电相互作用,Cd2+成为连接不同CdTe纳米晶的“桥梁”.PAA链上大量的羧基与CdTe纳米晶有较强的配位相互作用,可以诱导纳米晶聚集.新制CdTe纳米晶在长期放置时,表面的羧基与Cd2+的相互作用导致纳米晶逐渐聚集.在聚集过程中纳米晶表面结构得到改善,并引起荧光增强.这些结果表明通过控制各种聚集条件,可以得到不同尺寸的聚集体.Water-soluble CdTe nanocrystals were prepared in the presence of 3-mercaptopropionic acid （MPA）. By adding additional Cd^2＋ or poly （acrylic-acid） （PAA） to the solution, aggregates of CdTe nanocrystals were obtained, and their size varied with the amount of Cd^2＋ or PAA. Cd^2＋ or PAA have an important effect on the aggregation process of CdTe. Additional Cd^2＋ can accelerate the formates of aggregates by linking with carboxyl on different CdTe particles, while PAA also acts as a linker between CdTe particles. When the freshly prepared nanocrystal solutions were stored for a long time, the interaction between the carboxyl and Cd^2＋ on different particles would lead to the formation of CdTe aggregation. The aggregation process was also a process of surface passivation which led to the dramatical increase of photolumineccnce intensity. These results showed that the size of the aggregates could be controlled by adjusting various conditions of aggregation.

关 键 词：CDTE 纳米晶 聚集体 结构研究 水相合成 调控 超晶格 静电相互作用 CD^2+ 构建 

分 类 号：O76[理学—晶体学]