Journal article
Size-Dependence of the Melting Temperature of Individual Au Nanoparticles
Technical University of Denmark1
Nanostructure and Functionality, Nanocharacterization, National Centre for Nano Fabrication and Characterization, Technical University of Denmark2
Nanocharacterization, National Centre for Nano Fabrication and Characterization, Technical University of Denmark3
National Centre for Nano Fabrication and Characterization, Technical University of Denmark4
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark5
Department of Physics, Technical University of Denmark6
Computational Atomic-scale Materials Design, Department of Physics, Technical University of Denmark7
Nanoparticles have an immense importance in various fields, such as medicine, catalysis, and various technological applications. Nanoparticles exhibit a significant depression in melting point as their size goes below ≈10 nm. However, nanoparticles are frequently used in high temperature applications such as catalysis where temperatures often exceed several 100 degrees which makes it interesting to study not only the melting temperature depression, but also how the melting progresses through the particle.
Using high-resolution transmission electron microscopy, the melting process of gold nanoparticles in the size range of 2–20 nm Au nanoparticles combined with molecular dynamics studies is investigated. A linear dependence of the melting temper-ature on the inverse particle size is confirmed; electron microscopy imaging reveals that the particles start melting at the surface and the liquid shell formed then rapidly expands to the particle core.
Language: | English |
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Year: | 2019 |
ISSN: | 15214117 and 09340866 |
Types: | Journal article |
DOI: | 10.1002/ppsc.201800480 |
ORCIDs: | Andersen, Anton Bay , Sebok, Bela , Chorkendorff, Ib , Schiøtz, Jakob and Hansen, Thomas W. |