Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
2D zinc blende nanoplatelets (NPLs) are well known for their optical properties that arise from their thickness defined with a sub-monolayer roughness. Cadmium chalcogenide 2D particles growth is well controlled but remains difficult to extend to other compositions. Thus, cation exchange, as introduced by Son et al in 2004 [1], could be considered. Although easy and practical, when one dimension is in the order of 1 nm, this method could lead to shape reconstruction, thus to a loss of the 2D aspect in the case of NPLs and beneficial optical properties. In order to overcome this issue, we studied the influence of the surface chemistry on the thermodynamic and kinetic of the cation exchange. We found that the lattice distortion induced by the ligands anchoring group [2] is an important parameter to consider on the thermodynamic. On the other hand, the ligand aliphatic chain length affects the kinetic of the reaction without modification of the particles’ final shape. Thus, we could find that thiolate ligands enable a cation exchange from CdSe NPLs to Cu2-xSe while preserving the 2D shape.
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