Phys. Rev. Lett. 92, 115507 (2004) [4 pages]Size- and Temperature-Dependent Structural Transitions in Gold NanoparticlesReceived 17 October 2003; published 19 March 2004 Size- and temperature-dependent structural transitions in gold nanoparticles were revealed with morphology statistics obtained by high-resolution electron microscopic observations for thousands of particles annealed in a helium heat bath. We found that gold nanoparticles over a wide size range, 3–14 nm, undergo a structural transformation from icosahedral to decahedral morphology just below the melting points. It was also clarified that the formation of bulk crystalline structures from the decahedral morphology requires the melt-freeze process due to an insurmountable high free-energy barrier. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.115507
DOI:
10.1103/PhysRevLett.92.115507
PACS:
61.46.+w, 36.40.Ei, 68.37.Lp, 82.60.Qr
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