化学
纳米晶
钙钛矿(结构)
卤化物
溶解
溴化物
纳米材料
纳米颗粒
配体(生物化学)
无机化学
化学工程
光化学
纳米技术
结晶学
物理化学
材料科学
工程类
受体
生物化学
作者
Zeke Liu,Yehonadav Bekenstein,Xingchen Ye,Son C. Nguyen,Joseph K. Swabeck,Dandan Zhang,Shuit‐Tong Lee,Peidong Yang,Wanli Ma,A. Paul Alivisatos
摘要
Lead halide perovskite nanocrystals (NCs) have emerged as attractive nanomaterials owing to their excellent optical and optoelectronic properties. Their intrinsic instability and soft nature enable a post-synthetic controlled chemical transformation. We studied a ligand mediated transformation of presynthesized CsPbBr3 NCs to a new type of lead–halide depleted perovskite derivative nanocrystal, namely Cs4PbBr6. The transformation is initiated by amine addition, and the use of alkyl-thiol ligands greatly improves the size uniformity and chemical stability of the derived NCs. The thermodynamically driven transformation is governed by a two-step dissolution–recrystallization mechanism, which is monitored optically. Our results not only shed light on a decomposition pathway of CsPbBr3 NCs but also present a method to synthesize uniform colloidal Cs4PbBr6 NCs, which may actually be a common product of perovskite NCs degradation.
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