Abstract
The thermal stability of highly ordered two-dimensional superlattices consisting ofdodecanethiol-ligated Au nanoparticles has been investigated using in situ grazing incidencesmall-angle x-ray scattering in air and in vacuum. In the lower temperature region (<70 °C),annealing in air results in a minimal change of superlattice structure, whereas annealing in vacuumleads to a considerable lattice contraction and a decrease in long-range order. At higher temperatures(>100 °C), ligand desorption causes nanocrystals to sinter locally, destroying quasi-long-range order.The sintering process is significantly enhanced in vacuum compared to the casein air due to the increased desorption rate of thiol ligands under low pressure.
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