Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 120, Issue 48, Pages 27682-27687Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b09708
Keywords
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Funding
- Robert A. Welch Foundation [F-1464, F-1696]
- National Science Foundation [CBET-1403768]
- NSF
- NIH/NIGMS via NSF Award [DMR-1332208]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1403768] Funding Source: National Science Foundation
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We recently observed that a disordered assembly of octadecanethiol-capped gold (Au) nanocrystals can order when heated from room temperature to 60 degrees C [Yu, Y.; Jain, A.; Guillaussier, A.; Voggu, V. R; Truskett, T. M.; Smilgies, D.-M.; Korgel, B. A. Faraday Discuss. 2015, 181, 181-192]. This inverse melting structural transition was reversible and occurred near the melting-solidification temperature of the capping ligands. To determine the generality of this phenomenon, we studied by in situ grazing incidence small-angle X-ray scattering (GISAXS) the structure of assemblies of Au nanocrystals with shorter C-12 and C-5 alkanethiol capping ligands that form ordered superlattices at room temperature and have a ligand melting-solidification temperature below room temperature. Superlattices of dodecanethiol-capped Au nanocrystals disorder when cooled below 260 K, which is the melting-solidification temperature for dodecanethiol. Au nanocrystals capped with even shorter pentanethiol ligands that have a melting transition below 100 K (the lowest experimentally accessible temperature) do not undergo the disorder transition.
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