Direct observation of liquid-like behavior of a single Au grain boundary

Authors

Gilberto Casillas, University of Texas at San AntonioFollow
Arturo Ponce, University Of Texas At San Antonio
Jesus Velazquez-Salazar, University Of Texas At San Antonio
M Jose-Yacaman, University of Texas at San Antonio

RIS ID

81302

Publication Details

Casillas, G., Ponce, A., Velazquez-Salazar, J. J. & Jose-Yacaman, M. (2013). Direct observation of liquid-like behavior of a single Au grain boundary. Nanoscale, 5 (14), 6333-6337.

Abstract

Behavior of matter at the nanoscale differs fromthat 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.