Dipole-Dipole Interaction-Induced Direct Self-Assembly of Ag<sub>2</sub>S Quantum Dots into Supercrystals in Solution.
basic_science · Level V
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- Record sourced from PubMed, PMID 40228077.
- Also identified by DOI 10.1021/acs.nanolett.5c00889.
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Abstract
Long-range ordered supercrystals (SCs) built up by colloidal nanocrystals (NCs) represent a class of novel metamaterials with unique collective properties. While great attention has been paid to the ligand-controlled assembly of NCs, the contribution of the inorganic core is considered limited because of the weak core-core interactions. Here, we report the spontaneous assembly of Ag<sub>2</sub>S quantum dots (QDs) into three-dimensional SCs in solution, driven by pronounced dipole-dipole interactions. Dielectric spectroscopy shows a large permanent dipole moment of 516.7 D in 4.2 nm Ag<sub>2</sub>S QDs, and multiscale molecular simulation proves the dipole-dipole interaction-driven crystallization of Ag<sub>2</sub>S QDs. Moreover, we demonstrate that tuning the dipole-dipole interactions facilitates the formation of diverse nanostructures, including SCs, nanochains, and monodisperse nanoparticles. These findings offer a straightforward strategy for SC synthesis and establish the dipole-dipole interactions as a key driving force of NC self-assembly with broad implications for colloidal nanomaterials and their emergent functionalities.