马万里教授课题组与加州大学伯克利分校Paul Alivisatos教授合作在Journal of the American Chemical Society上发表论文

发布时间:2017-06-15访问量:256设置

题目:

Ligand Mediated Transformation of Cesium Lead Bromide Perovskite Nanocrystals to Lead  Depleted Cs4PbBr6 Nanocrystals

作者:

Zeke Liu,†,‡, Yehonadav Bekenstein,‡, Xingchen Ye, Son C. Nguyen, Joseph Swabeck,‡, Dandan Zhang,‡, Shuit-Tong Lee,† Peidong Yang,‡,§,, Wanli Ma,*, and A. Paul   Alivisatoss*,‡,§,,

单位:

Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, China

Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States

§Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720, United States

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720,   United States

Kavli Energy NanoScience Institute, University of California Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

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 CsPbBrNCs 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 drive 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.

影响因子:

13.858

分区情况:

1

链接:

http://pubs.acs.org/doi/abs/10.1021/jacs.7b01409

  

  

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