Krini Redouane, Ha Cheol Woo, Prabhakaran Prem, Mard Hicham El, Yang Dong-Yol, Zentel Rudolf, Lee Kwang-Sup
Department of Organic Chemistry, Johannes Gutenberg University, Mainz, Duesbergweg 10-14, 55099, Mainz, Germany.
Department of Advanced Materials, Korean Advanced Institute of Science and Technology (KAIST), Daejeon, 305-811, Korea.
Macromol Rapid Commun. 2015 Jun;36(11):1108-14. doi: 10.1002/marc.201500045. Epub 2015 Apr 8.
In this paper, the surface modification of CdSe- and CdZnS-based quantum dots (QDs) with a functional silica shell is reported. Functionalized silica shells are prepared by two routes: either by ligand exchange and a modified Stöber process or by a miniemulsion process with amphiphilic poly(oxyethylene) nonylphenylether also know as Igepal CO-520 (IG) as oligomeric amphiphile and modified silica precursors. The polymerizable groups on the functionalized silica shell allow covalent bonding to a polymer matrix and prevent demixing during polymerization and crosslinking. This allows the homogeneous incorporation of QDs in a crosslinked polymer matrix. This paper furthermore demonstrates that the resulting QDs, which are i) shielded with a proper silica shell and ii) functionalized with crosslinkable groups, can be used in two-photon-initiated polymerization processes in combination with different photoresists to obtain highly luminescent 3D structures. The resulting luminescent structures are attractive candidates for photonics and metamaterials research.
本文报道了用功能性二氧化硅壳对基于CdSe和CdZnS的量子点（QDs）进行表面改性。功能性二氧化硅壳通过两种途径制备：要么通过配体交换和改进的Stöber法，要么通过以两亲性聚（氧乙烯）壬基苯基醚（也称为Igepal CO - 520，简称IG）作为低聚两亲物和改性二氧化硅前体的微乳液法。功能性二氧化硅壳上的可聚合基团允许与聚合物基体进行共价键合，并防止在聚合和交联过程中发生分层。这使得量子点能够均匀地掺入交联聚合物基体中。本文还证明，所得到的量子点，即i）用合适的二氧化硅壳屏蔽且ii）用可交联基团功能化的量子点，可与不同光刻胶结合用于双光子引发的聚合过程，以获得高发光的三维结构。所得到的发光结构是光子学和超材料研究的有吸引力的候选材料。
