郑伟威博士
艾默里大学
报告时间：4月11日（周五）下午14:00
报告地址：科学楼902
报告摘要：
Semiconductor quantum dots (QDs) with size-tunable luminescence are one of the most interesting materials capturing the interest of researchers over the past decades, and have broad applications in biological imaging, light-emitting devices, solar cells, photo-detectors, and quantum computing. In my study, a sensitive magnetic probe was developed to detect the microenvironments of surface and core of a QD, as well as interface of core/shell QDs. Regarding biological applications, lipid vesicle encapsulation is an efficient approach to transfer hydrophobic QDs into aqueous solutions. Our study indicates that lipid membranes can control the chemical and optical properties of QDs in a phase-dependent manner. Using gel-phase lipid vesicle templates, we are able to achieve the most photostable non-core/shell QDs in aqueous solution. More importantly, the site-specifically engineering of QDs can be achieved using phospholipid-QD hybrid vesicle templates to generate gold NP-QD assemblies programmed by Watson-Crick base-pairing for use as a multi-functional cargo for fluorescence-based imaging and potential drug delivery.
报告人简介：
郑伟威博士，05年至11年在美国佛罗里达州立大学化学与生物化学系获博士学位，从事稀磁半导体量子点的磁性与尺寸和位置的依赖性研究。12年至今，在美国埃默里大学从事量子点的功能化及在生物体系中的应用研究。郑伟威博士在水相体系获得了光学上最稳定的非核壳结构的量子点，并通过脂质体胶体模板实现了特定位置的选择性功能化；首次报道了Cr掺杂的ZnSe量子点，并发现了ZnSe量子点核中存在具有尖晶石结构的ZnCr2Se4包容物；在Mn掺杂的II-VI量子点中发现了表面载流子调制的铁磁耦合以及Cr掺杂的II-VI量子点中的低温相转化现象；发展了一种灵敏的磁性探针，可用于检测量子点的表面、核及界面的微环境及晶格应力。相关研究分别发表在J. Am. Chem. Soc. （4篇）、Nano. Lett. （1篇）、Adv. Funct. Mater. 及J. Phys. Chem. C 等杂志上。郑伟威博士的研究曾获得佛罗里达州立大学最佳博士论文奖。