Nanocrystals of Lead Chalcohalides: A Series of Kinetically Trapped Metastable Nanostructures.

ABSTRACT: We report the colloidal synthesis of a series of surfactant-stabilized lead chalcohalide nanocrystals. Our work is mainly focused on Pb₄S₃Br₂, a chalcohalide phase unknown to date that does not belong to the ambient-pressure PbS-PbBr₂ phase diagram. The Pb₄S₃Br₂ nanocrystals herein feature a remarkably narrow size distribution (with a size dispersion as low as 5%), a good size tunability (from 7 to ∼30 nm), an indirect bandgap, photoconductivity (responsivity = 4 ± 1 mA/W), and stability for months in air. A crystal structure is proposed for this new material by combining the information from 3D electron diffraction and electron tomography of a single nanocrystal, X-ray powder diffraction, and density functional t

SUBMITTER: Toso S 

PROVIDER: S-EPMC7737912 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature