Quantum dots (QDs) have size-tunable optical properties, such as photostability, strong photoluminescence and a large Stokes-shift, which make it possible to adapt them to various biological applications. In many cases, surface modification of QDs by carboxylate ligands has been extensively studied. However, there have been few applications on QDs modified with a potential cationic ligand such as amine. In this study, we synthesized robust amine-functionalized QDs and modified their surface with poly(ethylene glycol) for long-term stability. These QDs showed an excellent stability over a broad pH-range and remarkable internalization efficiency into living cells.
                                    量子点(QDs)具有尺寸可调的光学特性,如光稳定性、强光致发光和较大的斯托克斯偏移,这使其能够适应各种
生物应用。在许多情况下,人们已经广泛研究了
羧酸配体对 QDs 的表面修饰。然而,用潜在的阳离子
配体(如胺)修饰 QDs 的应用还很少。在这项研究中,我们合成了强健的胺功能化 QDs,并用聚
乙二醇修饰其表面以获得长期稳定性。这些 QDs 在广泛的 pH 值范围内表现出卓越的稳定性,并且在活细胞中具有显著的内化效率。