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  Direct observation and analysis of york-shell materials using low-voltage high-resolution scanning electron microscopy: Nanometal-particles encapsulated in metal-oxide, carbon, and polymer

Asahina, S., Suga, M., Takahashi, H., Jeong, H. Y., Galeano Nunez, D. C., Schüth, F., et al. (2014). Direct observation and analysis of york-shell materials using low-voltage high-resolution scanning electron microscopy: Nanometal-particles encapsulated in metal-oxide, carbon, and polymer. APL Materials, 2(11): 113317, pp. 113317-1-113317-7. doi:10.1063/1.4902435.

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 Creators:
Asahina, Shunsuke1, Author
Suga, Mitsuo1, Author
Takahashi, Hideyuki1, Author
Jeong, Hu Young2, Author
Galeano Nunez, Diana Carolina3, Author              
Schüth, Ferdi3, Author              
Terasaki, Osamu2, 4, Author              
Affiliations:
1JEOL Ltd., SM Business Unit, Tokyo, Japan , ou_persistent22              
2Graduate School of EEWS, WCU/BK21+, KAIST, Daejeon 305-701, South Korea , ou_persistent22              
3Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
4Department of Physical, Inorganic and Structural Chemistry, Arrhenius Laboratories, Stockholm University, Stockholm, Sweden, ou_persistent22              

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 Abstract: Nanometal particles show characteristic features in chemical and physical properties depending on their sizes and shapes. For keeping and further enhancing their features, the particles should be protected from coalescence or degradation. One approach is to encapsulate the nanometal particles inside pores with chemically inert or functional materials, such as carbon, polymer, and metal oxides, which contain mesopores to allow permeation of only chemicals not the nanometal particles. Recently developed low-voltage high-resolution scanning electron microscopy was applied to the study of structural, chemical, and electron state of both nanometal particles and encapsulating materials in york-shell materials of Au@C, Ru/Pt@C, Au@TiO2, and Pt@Polymer. Progresses in the following categories were shown for the york-shell materials: (i) resolution of topographic image contrast by secondary electrons, of atomic-number contrast by back-scattered electrons, and of elemental mapping by X-ray energy dispersive spectroscopy; (ii) sample preparation for observing internal structures; and (iii) X-ray spectroscopy such as soft X-ray emission spectroscopy. Transmission electron microscopy was also used for characterization of Au@C.

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Language(s): eng - English
 Dates: 20142014
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.4902435
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Title: APL Materials
Source Genre: Journal
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Publ. Info: AIP Scitation
Pages: - Volume / Issue: 2 (11) Sequence Number: 113317 Start / End Page: 113317-1 - 113317-7 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/2166-532X