Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.098
Publication date: 18th July 2019
The ability to tune thin metal oxide coatings by wet-chemistry is desirable for many applications, yet it remains a key synthetic challenge. In this work, we introduce a general colloidal atomic layer deposition (c-ALD) synthesis to grow metal oxide shells (AlOx, ZnOx, TiOx) and tunable thickness (1 to 6 nm) around nanocrystalline cores of different compositions, including perovskite quantum dots (PeQDs).[1] We compare the c-ALD with the previously developed gas-phase ALD in film to highlight its advantages which comprise the preserved colloidal dispersability, the improved optical properties and the stability.[1,2] Finally, we illustrate the importance to finely tune the metal oxide shell thickness to study nanoscale phenomena such as energy transfer between PeQDs and CdSe nanoplates and the anion exchange reaction in PeQDs.[2] The latter was investigated by in situ X-ray diffraction, which had been impeded so far by the instability of this class of materials and by the fast exchange kinetics.
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