期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 15, 页码 5309-5312出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01409
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within Physical Chemistry of Inorganic Nanostructures Program [DE-AC02-05-CH11231, KC3103]
- National Key Research Projects [2016YFA0202402]
- National Natural Science Fund [61674111]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- National Postdoctoral Program for Innovative Talents [BX201600113]
- State-Sponsored Scholarship for Graduate Students from China Scholarship Council
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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