Zwitterionic Block Copolymers for the Synthesis and Stabilization of Perovskite Nanocrystals
Zwitterionic Block Copolymers for the Synthesis and Stabilization of Perovskite Nanocrystals
复制标题
用于钙钛矿纳米晶体合成和稳定的两性离子嵌段共聚物
DOI：
10.1002/chem.202200409
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Emrick, Todd
中科院分区：
文献类型：
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作者：
Cueto, Christopher;Donoghue, Colleen;Bolduc, Kimberly;Emrick, Todd
用于制备铯铅卤化物钙钛矿纳米晶体（CsPbX 3 PNC，其中X=Cl、Br或I）的传统热注入方法依赖于小分子表面活性剂来产生具有立方体、板状或棒状形态的PNC。在这里，我们描述了一种新的方法，其中两性离子嵌段共聚物被用作PNC合成中的大分子配体，从而提供具有优异的胶体稳定性、高光致发光量子产率以及在某些情况下明显的非立方形状的PNC。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-溶解在用于PNC生长的有用溶剂中，尽管含有大摩尔百分比的两性离子基团。发现用嵌段共聚物配体制备的PNC在一系列极性有机溶剂中分散并保留其荧光，并且适合于直接整合成具有高PNC含量的光学透明纳米复合材料薄膜。
Traditional hot injection methods for the preparation of cesium lead halide perovskite nanocrystals (CsPbX3PNCs, 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.