Unknown

Dataset Information

0

Cation Exchange and Spontaneous Crystal Repair Resulting in Ultrathin, Planar CdS Nanosheets.


ABSTRACT: Cation exchange has become a major postsynthetic tool to obtain nanocrystals with a combination of stoichiometry, size, and shape that is challenging to achieve by direct wet-chemical synthesis. Here, we report on the transformation of highly anisotropic, ultrathin, and planar PbS nanosheets into CdS nanosheets of the same dimensions. We monitor the evolution of the Cd-for-Pb exchange by ex-situ TEM, HAADF-STEM, and EDX. We observe that in the early stages of the exchange the sheets show large in-sheet voids that repair spontaneously upon further exchange and annealing, resulting in ultrathin, planar, and crystalline CdS nanosheets. After cation exchange, the nanosheets show broad sub-band gap luminescence, as often observed in CdS nanocrystals. The photoluminescence excitation spectrum reveals the heavy- and light-hole exciton features, with very strong quantum confinement and large electron-hole Coulomb energy, typical for 2D ultrathin Cd-chalcogenide nanosheets.

SUBMITTER: van der Sluijs MM 

PROVIDER: S-EPMC10568967 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature

altmetric image

Publications

Cation Exchange and Spontaneous Crystal Repair Resulting in Ultrathin, Planar CdS Nanosheets.

van der Sluijs Maaike M MM   Vliem Jara F JF   de Wit Jur W JW   Rietveld Jeppe J JJ   Meeldijk Johannes D JD   Vanmaekelbergh Daniel A M DAM  

Chemistry of materials : a publication of the American Chemical Society 20230928 19


Cation exchange has become a major postsynthetic tool to obtain nanocrystals with a combination of stoichiometry, size, and shape that is challenging to achieve by direct wet-chemical synthesis. Here, we report on the transformation of highly anisotropic, ultrathin, and planar PbS nanosheets into CdS nanosheets of the same dimensions. We monitor the evolution of the Cd-for-Pb exchange by <i>ex-situ</i> TEM, HAADF-STEM, and EDX. We observe that in the early stages of the exchange the sheets show  ...[more]

Similar Datasets

| S-EPMC7525434 | biostudies-literature
| S-EPMC9933437 | biostudies-literature
| S-EPMC6296167 | biostudies-literature
| S-EPMC6377181 | biostudies-literature
| S-EPMC9900602 | biostudies-literature
| S-EPMC4942328 | biostudies-literature
| S-EPMC4213769 | biostudies-literature
| S-EPMC5956979 | biostudies-literature
| S-EPMC8843971 | biostudies-literature
| S-EPMC6640765 | biostudies-literature