Journal
NANOSCALE
Volume 5, Issue 14, Pages 6333-6337Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr01501g
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Funding
- NSF-PREM Grant [DMR 0934218, DMR-1103730]
- Welch Foundation [AX-1615]
- NIH - RCMI [5G12RR013646-12]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [934218, 1103730] Funding Source: National Science Foundation
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Behavior of matter at the nanoscale differs from that of the bulk due to confinement and surface effects. Here, we report a direct observation of liquid-like behavior of a single grain boundary formed by cold-welding Au nanoparticles, 40 nm in size, by mechanical manipulation in situ TEM. The grain boundary rotates almost freely due to the free surfaces and can rotate about 90 degrees. The grain boundary sustains more stress than the bulk, confirming a strong bonding between the nanoparticles. Moreover, this technique allows the measurement of the surface diffusion coefficient from experimental observations, which we compute for the Au nanoparticles. This methodology can be used for any metal, oxide, semiconductor or combination of them.
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