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Stable and Recyclable Photocatalysts of CsPbBr3@MSNs Nanocomposites for Photoinduced Electron Transfer RAFT Polymerization
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-11-11 , DOI: 10.1021/acsenergylett.2c02293
Chunyu Zhao 1 , Haixia Song 1 , Yinghao Chen 1 , Wei Xiong 1 , Mingyou Hu 1 , Youshen Wu 1 , Yanfeng Zhang 1 , Ling He 1 , Yi Liu 2 , Aizhao Pan 1
Affiliation  

All-inorganic metal halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have demonstrated attractive optoelectronic characteristics. However, their photocatalytic properties are limited by their poor stability and easy recombination of photogenerated carriers. Herein, we introduced a CsPbBr3@MSNs nanocomposite (CsPbBr3 NCs embedded in dendritic mesoporous silica nanospheres (MSNs)) as photocatalysts for photoinduced electron transfer reversible addition–fragmentation chain transfer (PET-RAFT) polymerization. The CsPbBr3 nanocrystals (∼8.1 nm; PLQY of 62 ± 2.1%) were embedded in dendritic MSNs using a nanoconfinement strategy. PET-RAFT polymerization was successfully initiated using the CsPbBr3@MSNs nanocomposite as the photocatalyst. Reaction variables, such as catalyst loading, monomer composition, and excitation light wavelengths, were varied to yield polymers with the desired control of molecular weight and dispersity as well as block copolymers with high chain-end fidelity. In addition, the perovskite-based photocatalysts could be readily separated and purified, which allowed effective and rapid recycling of the nanocomposites for multiple polymerization cycles.

中文翻译:

用于光诱导电子转移 RAFT 聚合的 CsPbBr3@MSNs 纳米复合材料的稳定和可回收光催化剂

全无机金属卤化物钙钛矿 CsPbX 3 (X = Cl, Br, I) 纳米晶体 (NCs) 表现出极具吸引力的光电特性。然而,它们的光催化性能受到稳定性差和光生载流子容易复合的限制。在此,我们介绍了一种 CsPbBr 3 @MSNs 纳米复合材料(嵌入树枝状介孔二氧化硅纳米球 (MSNs) 中的 CsPbBr 3 NCs)作为光诱导电子转移可逆加成-断裂链转移 (PET-RAFT) 聚合的光催化剂。使用纳米限制策略将CsPbBr 3纳米晶体(~8.1 nm;PLQY 为 62 ± 2.1%)嵌入到树枝状 MSN 中。使用 CsPbBr 3成功引发 PET-RAFT 聚合@MSNs 纳米复合材料作为光催化剂。改变反应变量,例如催化剂负载量、单体组成和激发光波长,以生成具有所需分子量和分散性控制的聚合物以及具有高链端保真度的嵌段共聚物。此外,基于钙钛矿的光催化剂可以很容易地分离和纯化,这使得纳米复合材料能够有效和快速地回收用于多个聚合循环。
更新日期:2022-11-11
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