AI Article Synopsis
- The shape of colloidal semiconductor nanocrystals (NCs) significantly affects their energy levels and optoelectronic properties, making it a topic of interest beyond just their crystallography.
- Research shows that while thermodynamic factors suggest few stable shapes, a surprising variety, including spherical quantum dots and rods, exists, particularly in materials like CdSe.
- The study details the transformation of two-dimensional CdSe nanoplatelets into quantum rings, tracked through advanced techniques that reveal how material moves and reshapes at higher temperatures.
Article Abstract
The variation in the shape of colloidal semiconductor nanocrystals (NCs) remains intriguing. This interest goes beyond crystallography as the shape of the NC determines its energy levels and optoelectronic properties. While thermodynamic arguments point to a few or just a single shape(s), terminated by the most stable crystal facets, a remarkable variation in NC shape has been reported for many different compounds. For instance, for the well-studied case of CdSe, close-to-spherical quantum dots, rods, two-dimensional nanoplatelets, and quantum rings have been reported. Here, we report how two-dimensional CdSe nanoplatelets reshape into quantum rings. We monitor the reshaping in real time by combining atomically resolved structural characterization with optical absorption and photoluminescence spectroscopy. We observe that CdSe units leave the vertical sides of the edges and recrystallize on the top and bottom edges of the nanoplatelets, resulting in a thickening of the rims. The formation of a central hole, rendering the shape into a ring, only occurs at a more elevated temperature.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8444342 | PMC |
| http://dx.doi.org/10.1021/acs.chemmater.1c01618 | DOI Listing |
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