Journal
FARADAY DISCUSSIONS
Volume 181, Issue -, Pages 181-192Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5fd00006h
Keywords
-
Categories
Funding
- Robert A. Welch Foundation [F-1464, F-1696]
- National Science Foundation [CBET-140378]
- NSF & NIH/NIGMS via NSF [DMR-0936384]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1403768] Funding Source: National Science Foundation
Ask authors/readers for more resources
Grazing incidence small angle X-ray scattering (GISAXS) measurements reveal that superlattices of 1.7 nm diameter, gold (Au) nanocrystals capped with octadecanethiol become significantly more ordered when heated to moderate temperatures (50-60 degrees C). This enhancement in order is reversible and the superlattice returns to its initially disordered structure when cooled back to room temperature. Disorder-order transition temperatures were estimated from the GISAXS data using the Hansen-Verlet criterion. Differential scanning calorimetry (DSC) measurements of the superlattices exhibited exotherms (associated with disordering during cooling) and endotherms (associated with ordering during heating) near the transition temperatures. The superlattice transition temperatures also correspond approximately to the melting and solidification points of octadecanethiol. Therefore, it appears that a change in capping ligand packing that occurs upon ligand melting underlies the structural transition of the superlattices. We liken the heat-induced ordering of the superlattices to an inverse melting transition.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available