Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.015
Publication date: 6th July 2018
The surface ligation of semiconductor nanocrystals determines their optical and transport properties, and purposeful control of surface chemistry is under active investigation. Colloidal 2D CdSe nanoribbons or quantum belts provide an ideal system for the study of rapid, reversible, and complete exchange of surface ligation at room temperature. L-type primary-amine ligation is readily replaced by Z-type Lewis acid ligation of type MX2 (M = Zn, Cd; X = carboxylate or halide). Re-exposure to primary amines removes the Z-type ligands and restores L-type ligation. Primary-amine ligation is readily converted to bound-ion-pair X-type ligation upon exposure of the quantum belts to acids HX (X = halide, carboxylate, or nitrate). Salts of type R4NX or NaX (X = carboxylate or halide) are unable to displace L-type ligation, but readily substitute for Z-type ligation, forming bound-ion-pair X-type ligation. This bound-ion-pair X-type ligation is readily exchanged to L-type ligation upon exposure to primary amines. The surface exchanges are characterized by a variety of means, and the absorption and emission spectra of the quantum belts are particularly sensitive to surface ligation. Such surface exchanges promise to optimize the properties of the 2D nanocrystals.
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