Electronic coupling between two nanocrystals is a facinating research topic. We focus on the developement of coupled collidal quantum dots (CQDs) by fusing two core/shell architechtures to form a dimer. Depending on the hybridization of wavefunctions based on the semiconductor type (type-I or type-II behavior) and the distance barrier between them, it is possible to achieve and tune the electronic coupling in a fused dimer and thus can be called CQD molecule. Utilizing the "artificial atom" character in CQDs, we have demonstrated a facile colloidal strategy to prepare artificial CQD molecule (CQDM). We explored the generality of the synthetic method and tunability of electronic coupling in model CdSe/CdS core/shell system via experimental and theoretical approaches (Nature Commun 2019 and J. Chem. Phys. 2019).
CQDM as Bowtie Nanoantenna: The tips of a tetrahedral nanocrystals are more reactive than the facets. Utilizing these behavior, we have prepared bowtie CQDM from core/shell CQDs. The CQD bowtie possess an electric field hotspot at the epicenter, which acts as selective photochemical reaction center (Angew. Chem. 2021).
Potential Future Applications of Prepared CQDMs:
The prepared CQDM remains a prospective candidate for numerous applications. Fine tuning of the core properties, shell barrier heights via nanocrystal chemistry, can lead to multitude possibilities towards targeted applications as in dual color emission, sensing, quantum computing etc. We are working on each of the topics, and stay tuned with this page for further update. Read more in our recent perspective in (Acc. Chem. Res. 2021).
New publication on "Neck Barrier Control" for tuning hybridization in CQD Molecules. (J. Am. Chem. Soc. 2021)
The research leading to these results has received financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No ).