Insitu atomic-scale observation of melting point suppression in nanometer-sized gold particles

Junggoo Lee, Joonho Lee, Toshihiro Tanaka, Hirotaro Mori

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42 Citations (Scopus)

Abstract

Phase stabilities of nanometer-sized materials are quite different from those of the corresponding bulk materials. Among the phase stabilities, melting point suppression is one of the most fundamentally important issues. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized Au particles, along with simple size reduction, was carried out by means of insitu high resolution electron microscopy. Namely, it was confirmed in real space on an atomic scale that a solid-to-liquid transition occurred when the size of a particle, placed on a graphite substrate maintained at 1100K, decreased to 5nm during diminution. Furthermore, a monolayer-thick hole was formed on the substrate at the position of the liquid Au particle, probably due to carbon dissolution into the liquid Au particle.

Original languageEnglish
Article number475706
JournalNanotechnology
Volume20
Issue number47
DOIs
Publication statusPublished - 2009 Nov 25

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ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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