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The influence of ligands on the low frequency vibration of differentthicknesses cadmium selenide colloidal nanoplatelets is investigated usingresonant low frequency Raman scattering. The strong vibration frequency shiftsinduced by ligand modifications as well as the sharp spectral linewidths makelow frequency Raman scattering a tool of choice to follow ligand exchange aswell as the nano-mechanical properties of the NPLs, as evidenced by acarboxylate to thiolate exchange study. Apart from their molecular weight, thenature of the ligands, such as the sulfur to metal bond of thiols, induces amodification of the NPLs as a whole, increasing the thickness by one monolayer.Moreover, as the weight of the ligands increases, the discrepancy between themassload model and the experimental measurements increase. These effects areall the more important when the number of layers is small and can only beexplained by a modification of the longitudinal sound velocity. Thismodification takes its origin in a change of lattice structure of the NPLs,that reflects on its elastic properties. These nanobalances are finally used tocharacterize ligands affinity with the surface using binary thiols mixtures,illustrating the potential of low frequency Raman scattering to finelycharacterize nanocrystals surfaces.

Ligand-dependent nano-mechanical properties of CdSe nanoplatelets: calibrating nanobalances for ligands affinity monitoring