Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.104
Publication date: 7th February 2022
Among semiconductor colloidal nanocrystals, 2D nanoplatelets (NPLs) are geometrically seen as well-defined flexible substrates for the self-assembly of molecules. In the presence of stress brought by surface stabilizers, helical structures are formed according to the parameters of the initial material [1,2].
Here, we demonstrate the control of the NPLs helices radii through the organic ligands, described as an anchoring group and an aliphatic chain of a given length. A perfect control in surface chemistry allows the tuning of the morphological feature of these nanohelices. Nonetheless, their optical properties are well-preserved upon surface modification. Structural studies done on these anisotropic nanoparticles unveil a preferential orientation effect on the resulting X-ray scattering patterns.
A mechanical model accounting for the misfit strain between the inorganic core and the surface ligands, enables to predict the nanohelices radii. The model treats the substrate layer, anchoring group and aliphatic chain contributions individually and demonstrates good agreement for all studied homo- and hetero-structure NPLs. It reveals ultimately that the self-assembly of organic ligands is equivalent to a layer, of Young modulus in lateral compression estimated close to 0.9 GPa. Furthermore, the chirality of the nanohelices shown in this work can be tuned by the ligands anchoring group and inverted from one population to another.
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Ne2DeM grant agreement n° 853049 and blackQD grant agreement n° 756225)
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