Elementary Charge Characterization of Single Quantum Dots in Solution.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40831070.
- Also identified by DOI 10.1021/acs.nanolett.5c02731 and PMC identifier 12412147.
- Licence recorded as CC BY-NC-ND.
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Abstract
Measuring quantum dot properties at the single-particle level in their native liquid environment provides a powerful means of deepening our understanding of quantum dot systems and advancing their applications. In this work, we successfully measure the electrical charge of individual CdSe/CdS core/shell quantum dots, with diameters of 15 and 25 nm, in a nonpolar liquid, with precision at the elementary charge level. This is accomplished by combining laser scanning microscopy with high-field electrophoresis, where the observed electrophoretic mobilities show clear clustering around values corresponding to discrete charge states. A thermodynamic charging model captures the dominant features of the probability distribution and size dependence of the observed charges. This research opens the possibility to study charge-related optical and electronic phenomena at the single-quantum-dot level in solution.