Cueto Christopher, Donoghue Colleen, Bolduc Kimberly, Emrick Todd
Polymer Science and Engineering Department, University of Massachusetts, Conte Center for Polymer Research, Amherst, MA 01003, USA.
K. Bolduc. Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA.
Chemistry. 2022 May 25;28(30):e202200409. doi: 10.1002/chem.202200409. Epub 2022 Apr 8.
Traditional hot injection methods for the preparation of cesium lead halide perovskite nanocrystals (CsPbX PNCs, where X=Cl, Br, or I) rely on small molecule surfactants to produce PNCs with cube, plate, or rod-like morphologies. Here, we describe a new method whereby zwitterionic block copolymers are employed as macromolecular ligands in PNC synthesis, affording PNCs with excellent colloidal stability, high photoluminescence quantum yield, and in some cases distinctly non-cubic shapes. The block copolymers used in this study - composed of a poly(n-butyl methacrylate) hydrophobic block and zwitterionic methacrylate hydrophilic blocks - dissolve in useful solvents for PNC growth despite containing large mole percentages of zwitterionic groups. PNCs prepared with block copolymer ligands were found to disperse and retain their fluorescence in a range of polar organic solvents and were amenable to direct integration into optically transparent nanocomposite thin films with high PNC content.
用于制备铯铅卤化物钙钛矿纳米晶体（CsPbX PNCs，其中X = Cl、Br或I）的传统热注入方法依靠小分子表面活性剂来制备具有立方、片状或棒状形态的PNCs。在此，我们描述了一种新方法，即两性离子嵌段共聚物在PNC合成中用作大分子配体，从而得到具有优异胶体稳定性、高光致发光量子产率且在某些情况下具有明显非立方形状的PNCs。本研究中使用的嵌段共聚物由聚（甲基丙烯酸正丁酯）疏水嵌段和两性离子甲基丙烯酸酯亲水嵌段组成，尽管含有大量摩尔百分比的两性离子基团，但仍可溶于对PNC生长有用的溶剂中。发现用嵌段共聚物配体制备的PNCs能在一系列极性有机溶剂中分散并保持其荧光，并且适合直接整合到具有高PNC含量的光学透明纳米复合薄膜中。
