CAJ | 학술논문

针对当前水相合成的量子点(QDs)光性能与稳定性等方面存在的不足，发展了基于聚合物多齿配体的水相制备策略。利用巯基修饰的聚丙烯酸(PAA-SH)作为多齿配体代替常用的巯基丙酸等单齿配体，结合微波辅助加热制备了CdTe量子点，研究了多齿配体对量子点的生长机制与荧光性能的影响。以PAA-SH为配体制备的CdTe量子点荧光性能优异(荧光量子效率(PLQY)可达75%)，流体力学直径较小(~10 nm)，稳定性也有明显提高。基于聚合物多齿配体的量子点制备技术有助于实现生物医学研究中急需的兼具高亮度、高稳定性、小尺寸等特征的高性能量子点生物探针的制备。
침대당전수상합성적양자점(QDs)광성능여은정성등방면존재적불족，발전료기우취합물다치배체적수상제비책략。이용구기수식적취병희산(PAA-SH)작위다치배체대체상용적구기병산등단치배체，결합미파보조가열제비료CdTe양자점，연구료다치배체대양자점적생장궤제여형광성능적영향。이PAA-SH위배체제비적CdTe양자점형광성능우이(형광양자효솔(PLQY)가체75%)，류체역학직경교소(~10 nm)，은정성야유명현제고。기우취합물다치배체적양자점제비기술유조우실현생물의학연구중급수적겸구고량도、고은정성、소척촌등특정적고성능양자점생물탐침적제비。
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.