基于聚合物多齿配体的高性能CdTe量子点的微波水相合成
Synthesis of High Quality CdTe Quantum Dots in Aqueous Solution Using Multidentate Polymer Ligands under Microwave Irradiation
摘要
Abstract
Quantum dots (QDs) have recently attracted considerable attention due to their unique optical properties and potential applications in biomedicine and optoelectronics. Although the organic synthesis of QDs is popular, aqueous synthesis is also very attractive not only for its low cost, low toxicity, and low reaction temperature, but also because the as-prepared QDs can be used directly for bio-related applications without the requirement for complicated surface modification processes. However, the monodentate ligands typical y used for aqueous synthesis have limited binding ability, which can lead to weak col oidal stability and low photoluminescence. To solve these problems, we explored the use of multidentate thiol-containing polymer (PAA-SH) as a ligand to synthesize CdTe QDs and studied the influence of the ligand on the growth mechanism and photoluminescent properties of the QDs. PAA-SH was synthesized by conjugating cysteamine to poly(acrylic acid) (PAA) in the presence of dicyclohexylcarbodi mide. CdTe QDs of different sizes were prepared in aqueous solutions using PAA-SH as a ligand under microwave irradiation. The resulting PAA-SH-capped CdTe QDs show high photoluminescence quantum yield (PLQY) (up to 75%) without CdS shel coating, which is much better than the CdTe QDs synthesized using monodentate ligands. Furthermore, the hydrodynamic diameter of the PAA-SH-coated CdTe QDs is about 10 nm, and therefore much smal er than the polymer or SiO2 encapsulated QDs. In contrast, benefitting from cooperative binding effect of the multiple thiol groups and the high free energy for the ligand detachment from the QDs surface, PAA-SH-CdTe QDs show high storage stability.关键词
多齿配体/高性能/量子点/微波水相合成Key words
Multidentate ligand/High quality/Quantum dots/Microwave aqueous synthesis分类
化学化工引用本文复制引用
宇文力辉,薛冰,汪联辉..基于聚合物多齿配体的高性能CdTe量子点的微波水相合成[J].物理化学学报,2014,(5):994-1000,7.基金项目
The project was supported by the Major Research Plan of China (2012CB933301), National Natural Science Foundation of China (21204038,81273409), PCSIRT of the Ministry of Education of China (IRT1148), Ph.D. Programs Foundation of Ministry of Education of China (20123223110007), Natural Science Foundation of Jiangsu Province, China (BK20130862), Natural Science Foundation of Universities from Jiangsu Province, China (13KJB150029), Open Research Fund of State Key Laboratory of Bioelectronics, Southeast University, China and Open Research Fund of State Key Laboratory of Coordination Chemistry, Nanjing University, China.国家重大科学研究计划(2012CB933301),国家自然科学基金(21204038,81273409),教育部长江学者和创新团队发展计划(IRT1148),教育部博士点基金(20123223110007),江苏省自然科学基金(BK20130862),江苏省高校自然科学基金(13KJB150029),东南大学生物电子学国家重点实验室和南京大学配位化学重点实验室开放研究基金资助 （2012CB933301）
