In situ HREM study on sublimation-induced phase change in nanometer-sized gold and silver particles

Jung Goo Lee, Chunrin Chien, Chul Jin Choi, Hirotaro Mori

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The 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. Until now, the melting point suppression was studied with nanoparticles supported by solid substrates. However, the substrate effect on melting point of the nanoparticles has not been taken into consideration. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized gold and silver particles on graphite substrate, along with simple size reduction, was conducted by in-situ high resolution electron microscopy. Namely, it was confirmed that a crystalline-to-liquid transition occurred when the size of gold particle, being placed on graphite substrate maintained at 1100 K, decreased down to 5 nm during diminution. However, no crystalline-to-liquid transition, only a crystalline-to-gas transition, took place in graphite-supported silver nanoparticles prior to the complete disappearance of the particles.

    Original languageEnglish
    Title of host publicationProceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010
    Pages530-533
    Number of pages4
    Publication statusPublished - 2010 Sep 10
    Event20th International Offshore and Polar Engineering Conference, ISOPE-2010 - Beijing, China
    Duration: 2010 Jun 202010 Jun 25

    Publication series

    NameProceedings of the International Offshore and Polar Engineering Conference
    Volume4
    ISSN (Print)1098-6189
    ISSN (Electronic)1555-1792

    Other

    Other20th International Offshore and Polar Engineering Conference, ISOPE-2010
    CountryChina
    CityBeijing
    Period10/6/2010/6/25

    Keywords

    • Gold
    • In-situ TEM
    • Nanoparticles
    • Silver
    • Sublimation

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Ocean Engineering
    • Mechanical Engineering

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