Thermal stability of two-dimensional gold nanocrystal superlattices.
The thermal stability of highly ordered two-dimensional superlattices consisting of dodecanethiol-ligated Au nanoparticles has been investigated using in situ grazing incidence small-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 vacuum leads 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 case in air due to the increased desorption rate of thiol ligands under low pressure.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); SUF-USR; PSC-USR
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1001161
- Report Number(s):
- ANL/CNM/JA-63249; TRN: US201101%%884
- Journal Information:
- J. Phys.: Cond. Matter, Vol. 21, Issue 26 ; Jul. 2009
- Country of Publication:
- United States
- Language:
- ENGLISH
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