Peanut-Shaped and Rodlike Quantum-Dot Homodimers Epitaxially Attached along the Wurtzite ⟨1010⟩ Axis.
basic_science · Level V
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- Record sourced from PubMed, PMID 42473163.
- Also identified by DOI 10.1021/acs.nanolett.6c02418.
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Abstract
Monodisperse CdSe@CdS dot@platelet quantum dots (QDs), free of stacking faults, are synthesized for formation of the peanut-shaped homodimers connected by an epitaxial neck (<i>p</i>-dimers). Instead of attachment along the wurtzite ⟨1120⟩ axis of QDs with stacking faults, the stacking-fault-free QDs attach to each other along the wurtzite ⟨1010⟩ axis. Furthermore, the reaction system enables in situ epitaxial neck-filling to form rodlike homodimers (<i>r</i>-dimers). The resulting <i>p</i>-dimers and <i>r</i>-dimers are monodisperse in size, inter-QD connecting dimension (i.e., neck or filled neck), and QD-QD alignment, allowing resolution of energy gap between bonding and antibonding levels at an ensemble level. Formation of <i>r</i>-dimers not only enhances quantum coupling between two epitaxially attached QDs but also augments optical properties of artificial diatomic molecules. These advancements pave the way for the solution-phase synthesis of high-quality artificial molecules for fundamental research and technical applications.