Skaff Habib, Sill Kevin, Emrick Todd
Polymer Science and Engineering Department, Conte Center for Polymer Research, 120 Governors Drive, University of Massachusetts, Amherst, Massachusetts 01003, USA.
J Am Chem Soc. 2004 Sep 15;126(36):11322-5. doi: 10.1021/ja047260r.
In polymernanoparticle composites, uniform dispersion of the nanoparticles carries advantages over cases where nanoparticle aggregation dominates. Such dispersion has been particularly difficult to obtain in the case of composites prepared from nanoparticles and conjugated polymers. Here, we show that cadmium selenide nanocrystals, or quantum dots, can be integrated into thin films of poly(para-phenylene vinylene) (PPV) without aggregation. The two key departures from previous studies of quantum-dot/electronic polymer composites are (1) the synthesis of high-quality quantum dots directly in novel, functional ligands, thus eliminating the need for ligand exchange, and (2) polymerization chemistry that grafts PPV to the quantum dot surface. Solid-state photoluminescence spectra of composite materials prepared by these novel techniques reveal the critical importance of the quantum dot-polymer interface that will enable new investigations in nanoparticle-based light-emitting devices.
在聚合物纳米颗粒复合材料中，纳米颗粒的均匀分散比纳米颗粒聚集占主导的情况具有优势。对于由纳米颗粒和共轭聚合物制备的复合材料而言，这种分散尤其难以实现。在此，我们表明硒化镉纳米晶体，即量子点，可以整合到聚对苯撑乙烯（PPV）薄膜中而不发生聚集。与之前对量子点/电子聚合物复合材料的研究相比，有两个关键的不同之处：（1）直接在新型功能性配体中合成高质量的量子点，从而无需进行配体交换；（2）通过聚合化学反应将PPV接枝到量子点表面。采用这些新技术制备的复合材料的固态光致发光光谱揭示了量子点 - 聚合物界面的至关重要性，这将为基于纳米颗粒的发光器件的新研究提供可能。
