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Thermally-induced reversible structural isomerization in colloidal semiconductor CdS magic-size clusters.

Nature communications (2018-06-29)
Baowei Zhang, Tingting Zhu, Mingyang Ou, Nelson Rowell, Hongsong Fan, Jiantao Han, Lei Tan, Martin T Dove, Yang Ren, Xiaobing Zuo, Shuo Han, Jianrong Zeng, Kui Yu
ABSTRACT

Structural isomerism of colloidal semiconductor nanocrystals has been largely unexplored. Here, we report one pair of structural isomers identified for colloidal nanocrystals which exhibit thermally-induced reversible transformations behaving like molecular isomerization. The two isomers are CdS magic-size clusters with sharp absorption peaks at 311 and 322 nm. They have identical cluster masses, but slightly different structures. Furthermore, their interconversions follow first-order unimolecular reaction kinetics. We anticipate that such isomeric kinetics are applicable to a variety of small-size functional nanomaterials, and that the methodology developed for our kinetic study will be helpful to investigate and exploit solid-solid transformations in other semiconductor nanocrystals. The findings on structural isomerism should stimulate attention toward advanced design and synthesis of functional nanomaterials enabled by structural transformations.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cadmium oxide, ≥99.99% trace metals basis
Sigma-Aldrich
trans-2-[3-(4-tert-Butylphenyl)-2-methyl-2-propenylidene]malononitrile, ≥98%

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