上海科技大学知识管理系统

一种溶剂介导纳米晶自组装制备溴碘掺杂钙钛矿纳米线的方法，该方法首先通过热注入法制备得到分散良好的溴碘掺杂纳米晶，离心分离后加入适量甲苯溶剂再次进行提纯分离，最后溶解在一定量的甲苯溶剂中，低温避光静置6‑10天，溶剂中的纳米晶通过溶剂与配体相互作用及配体之间相互作用的协调最后自组装为一维单晶纳米线。液相法制备得到的CsPbBr1.2I1.8一维单晶纳米线直径为30‑100nm表面光滑，长度可达几微米到十几微米。本发明具有操作简便、可重复性高、晶体质量高、形貌尺寸高度可控等优异特点。CsPbBr1.2I1.8一维单晶纳米线由于其极高的展弦比从而具有较高的极化各向异性比，在偏振荧光材料及极化敏感的光电探测器方面有很好的应用前景。

The invention relates to a method for preparing bromine-iodine doped perovskite nanowires by solvent-mediated nanocrystalline self-assembly, wherein the method comprises the steps : preparing well dispersed bromine-iodine doped nanocrystals by a thermal injection method, centrifugally separating, adding a proper amount of toluene solvent, purifying and separating again, finally dissolving in a certain amount of toluene solvent, and standing at low temperature in a dark place for 6-10 days; and finally self-assembling nanocrystalline in the solvent into the one-dimensional single crystal nanowires through the interaction of the solvent and the ligands and the coordination of the interaction between the ligands. The diameter of the CsPbBr1.2I1.8 one-dimensional single crystal nanowire prepared by the liquid phase method is 30-100 nm, the surface of the nanowire is smooth, and the length of the nanowires can reach several microns to dozens of microns. The method has the excellent characteristics of simplicity and convenience in operation, high repeatability, high crystal quality, controllable morphology and size height and the like. The CsPbBr1.2I1.8 one-dimensional single crystal nanowires have a relatively high polarization anisotropy ratio due to an extremely high aspect ratio, and have a good application prospect in the aspects of polarization fluorescent materials and polarization-sensitive photoelectric detectors.