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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。
PbS quantum dot (QD) / multiwalled carbon nanotube (MWCNT) heterojunction materials were prepared by thermal injection using lead chloride (PbCl2) and sublimed sulfur (S) as precursors and oleylamine as solvent. The morphology, structure and elemental analysis of PbS QD / MWCNT composite nanomaterials showed that the PbS QD with particle size of about 14 nm was tightly attached to the surface of MWCNT and the crystallinity of PbS QD was good. The atomic percentages of Pb and S were about 1 :1. The optical properties of PbS QDs were investigated. The results show that PbS QDs have unique infrared absorption properties. After complexing PbS QD and MWCNT with mass fraction of about 27% in the heterojunction material, there exists an interaction between quantum dots and MWCNTs. The quenching of the emission peaks of the fluorescence spectra showed that the migration of light-induced carriers exists between the MWCNTs and the PbS QDs. The nanocomposites have potential applications in the field of quantum dots modified carbon nanotube-based optoelectronic devices.