Hu Huicheng, Chen Min, Yao Nan, Wu Linzhong, Zhong Qixuan, Song Bin, Cao Muhan, Zhang Qiao
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou 215123, Jiangsu, P. R. China.
ACS Appl Mater Interfaces. 2021 Jan 27;13(3):4017-4025. doi: 10.1021/acsami.0c20349. Epub 2021 Jan 12.
One of the main challenges of all-inorganic cesium lead halide (CsPbX) perovskite nanocrystals (NCs) in photocatalysis is their poor stability in hostile environments such as polar solvents. Herein, we report highly stable CsPbBr colloidal nanocrystal clusters (CNCs) with uniform morphology and size prepared by using a PVP-assisted reprecipitation method. A possible formation process through a self-assembly avenue is proposed. These CsPbBr CNCs exhibit much enhanced resistance against a variety of polar solvents in comparison with CsPbBr NCs obtained from the commonly used hot-injection method. In addition, this method can be generalized to the synthesis of lead-free perovskites CNCs. The as-prepared CsPbBr CNCs display good reactivity and high durability in photocatalytic degradation of methylene blue in alcoholic systems. This work will shed some light on the stabilization of perovskite NCs in polar solvents and perovskite NC-based photocatalysts.
全无机铯铅卤化物（CsPbX）钙钛矿纳米晶体（NCs）在光催化中的主要挑战之一是它们在极性溶剂等恶劣环境中的稳定性较差。在此，我们报道了通过使用聚乙烯吡咯烷酮（PVP）辅助再沉淀法制备的具有均匀形态和尺寸的高度稳定的CsPbBr胶体纳米晶体簇（CNCs）。提出了一种通过自组装途径的可能形成过程。与通过常用热注入法获得的CsPbBr NCs相比，这些CsPbBr CNCs对多种极性溶剂表现出大大增强的抗性。此外，该方法可以推广到无铅钙钛矿CNCs的合成。所制备的CsPbBr CNCs在醇体系中光催化降解亚甲基蓝时表现出良好的反应活性和高耐久性。这项工作将为钙钛矿NCs在极性溶剂中的稳定性以及基于钙钛矿NCs的光催化剂提供一些启示。
