Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.056
Publication date: 22nd December 2022
Magic-sized clusters (MSC) are identical inorganic cores that maintain a closed-shell stability, inhibiting conventional growth processes. Because MSCs are smaller than nanoparticles they can mimic molecular-level processes, and because of their high organic-ligand/core ratio they have “soft” inter-particle interactions, with access to a richer phase diagram beyond the classical close packed structures. In this talk I will highlight some remarkable behavior we have recently found in both of these areas. MSCs have the ability to undergo a chemically-induced, reversible isomeric transformation between two discrete states. The diffusionless reconfiguration of the inorganic core follows a first order kinetic rate driven by a distortion of the ligand binding motifs. These MSCs also display a surprising ability to self-organize into hierarchical assemblies which span over six orders of magnitude in length scale. The films are optically active with g-factors among the highest reported for semiconductor particles. Since the physical origin of the chirality for highly-structured films is challenging, we developed a method for extracting the true chiroptic-CD signal from the raw data, derived using Mueller matrix and Stokes vector conventions, and we find that the origin of the chirality is from exciton coupling between adjacent MSCs. Beyond optical properties, the multiscale self-organization behavior of these MSCs provides a new platform for the design and study of complex materials.
References
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ACS Nano (2022 accepted https://doi.org/10.1021/acsnano.2c06730)
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