期刊
NANOSCALE
卷 7, 期 15, 页码 6498-6503出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr05811a
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资金
- EU project NanoMILE
- EPSRC
- European Regional Development Fund (EDRF)
- Engineering and Physical Sciences Research Council [EP/K006061/1] Funding Source: researchfish
- EPSRC [EP/K006061/1] Funding Source: UKRI
All nanostructures are metastable - but some are more metastable than others. Here we employ aberration-corrected electron microscopy and atomistic computer simulations to demonstrate the hierarchy of metastability in deposited, size-selected gold nanoparticles (clusters), an archetypal class of nanomaterials well known for the catalytic activity which only appears on the nanometer-scale. We show that the atomic structures presented by magic number Au-561, Au-742 and Au-923 clusters are locked. They are in fact determined by the solidification which occurs from the liquid state early in their growth (by assembly from atoms in the gas phase) followed by template growth. It is quite likely that transitions from a locked, metastable configuration to a more stable (but still metastable) structure, as observed here under the electron beam, will occur during catalytic reactions, for example.
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