PbS QD-MWCNT异质结材料合成与光学特性  

Synthesis and Optical Properties of the PbS QD-MWCNT Heterostructure Material

作　　者：鲁得泂 李晓琳[1] 胡南涛 沈勇[1] 魏良明[1] 

机构地区：[1]上海交通大学电子信息和电气工程学院 薄膜和微细加工教育部重点实验室,上海200240

出　　处：《微纳电子技术》2015年第1期25-30,共6页Micronanoelectronic Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA050504);U-M/SJTU联合研究资助项目

摘　　要：以氯化铅(PbCl2)和升华硫(S)为前驱体,油胺为溶剂,使用热注入方法制备PbS量子点(QD)/多壁碳纳米管(MWCNT)异质结材料。对PbS QD/MWCNT复合纳米材料进行形貌、结构和元素分析,发现粒径约为14 nm的PbS QD紧密附着在MWCNT表面,而且PbS QD的结晶性良好,Pb与S的原子百分比约为1∶1。对其进行光学特性分析,结果表明:PbS QD具有独特的红外吸收特性,在异质结材料中质量分数约占27%的PbS QD与MWCNT复合后,量子点与MWCNT之间存在相互作用,会对荧光光谱发射峰起到淬灭的影响,表明MWCNT与PbS QD之间存在光激载流子的迁移。该纳米复合材料在量子点修饰碳纳米管基的光电器件领域具有潜在的应用。The PbS quantum dot（QD）/multi-walled carbon nanotube（MWCNT）heterostructure material was prepared by the thermal injection method with the lead chloride（PbCl2）and sulphur（S）as the precursors and the oil amine as the solvent.The morphology,structure and element analysis of the PbS QD/MWCNT nanocomposite material indicate that the single-crystalline PbS QD with the particle size of about 14 nm are closely attached on the surface of the MWCNT.The crystallization of the PbS QD is good,and the atomic percentage between Pb and S is about 1∶1.The results of the optical properties analysis show that the PbS QD have a unique infrared absorption characteristic,and after compounding of the PbS QD with the mass fraction of about27%in the heterojunction material and MWCNT,due to the interaction between quantum dots and MWCNT,the quenching phenomenon of emission peaks in the fluorescence spectrum will occur.It shows that the photo-induced carrier migration exists between the MWCNT and PbS QD.The nanocomposite material has the potential application in the optoelectronic devices of the quantum dot-MWCNT hybrids.

关 键 词：PbS量子点(QD) 多壁碳纳米管(MWCNT) 纳米复合材料 光学特性 光生载流子 

分 类 号：TB383[一般工业技术—材料科学与工程]