Unexpected High Stiffness of Ag and Au Nanoparticles
- 28 January 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 100 (4), 045502
- https://doi.org/10.1103/physrevlett.100.045502
Abstract
We studied the compressibility of silver (10 nm) and gold (30 nm) nanoparticles, n-Ag and n-Au, suspended in a methanol-ethanol mixture by x-ray diffraction (XRD) with synchrotron radiation at pressures up to 30 GPa. Unexpectedly for that size, the nanoparticles show a significantly higher stiffness than the corresponding bulk materials. The bulk modulus of n-Au, , shows an increase of ca. 60% and is in the order of W or Ir. The structural characterization of both kinds of nanoparticles by XRD and high-resolution electron microscopy identified polysynthetic domain twinning and lamellar defects as the main origin for the strong decrease in compressibility.
Keywords
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