Room temperature ionic liquids for size control of noble metal nanoparticles on carbon supports

    Research output: Research - peer-reviewArticle

    • 9 Citations

    Abstract

    Unsupported noble metal nanoparticles and Pt nanoparticles supported on various carbon nanostructures were prepared in the absence and presence of various room temperature ionic liquids (RTILs) by a microwave process. UV-VIS spectroscopy analysis showed that RTILs accelerate the reduction rate of metal precursors and, depending on their anions, can act as a promoter, a capping material, and a reducing agent at the same time in the MW process to reduce metal precursors to metal particles. Transmission electron microscopy and X-ray diffraction analyses showed that Pt nanoparticles synthesized with the addition of RTILs are formed as discrete particles with sizes less than 2 nm and a very narrow size distribution, while most of the Pt nanoparticles without the addition of RTILs are highly agglomerated. It was also found that the size of Pt particles can be tailored by controlling the concentration of RTILs. Excellent, uniform dispersion of Pt nanoparticles on carbon supports can be achieved by the addition of RTILs. This approach enables size control of noble metal nanoparticles regardless of the nature of the supports and provides an easy way to investigate the effect of carbon supports on the catalytic activities of supported catalysts.

    LanguageEnglish (US)
    Pages43-55
    Number of pages13
    JournalCarbon
    Volume75
    DOIs
    StatePublished - 2014

    Profile

    Ionic Liquids
    Metal nanoparticles
    Precious metals
    Carbon
    Temperature
    Nanoparticles
    Metals
    Catalyst supports
    Reducing Agents
    Ultraviolet spectroscopy
    Anions
    Nanostructures
    Catalyst activity
    Microwaves
    Transmission electron microscopy
    X ray diffraction

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Room temperature ionic liquids for size control of noble metal nanoparticles on carbon supports. / Do, Inhwan; Drzal, Lawrence T.

    In: Carbon, Vol. 75, 2014, p. 43-55.

    Research output: Research - peer-reviewArticle

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    abstract = "Unsupported noble metal nanoparticles and Pt nanoparticles supported on various carbon nanostructures were prepared in the absence and presence of various room temperature ionic liquids (RTILs) by a microwave process. UV-VIS spectroscopy analysis showed that RTILs accelerate the reduction rate of metal precursors and, depending on their anions, can act as a promoter, a capping material, and a reducing agent at the same time in the MW process to reduce metal precursors to metal particles. Transmission electron microscopy and X-ray diffraction analyses showed that Pt nanoparticles synthesized with the addition of RTILs are formed as discrete particles with sizes less than 2 nm and a very narrow size distribution, while most of the Pt nanoparticles without the addition of RTILs are highly agglomerated. It was also found that the size of Pt particles can be tailored by controlling the concentration of RTILs. Excellent, uniform dispersion of Pt nanoparticles on carbon supports can be achieved by the addition of RTILs. This approach enables size control of noble metal nanoparticles regardless of the nature of the supports and provides an easy way to investigate the effect of carbon supports on the catalytic activities of supported catalysts.",
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    AB - Unsupported noble metal nanoparticles and Pt nanoparticles supported on various carbon nanostructures were prepared in the absence and presence of various room temperature ionic liquids (RTILs) by a microwave process. UV-VIS spectroscopy analysis showed that RTILs accelerate the reduction rate of metal precursors and, depending on their anions, can act as a promoter, a capping material, and a reducing agent at the same time in the MW process to reduce metal precursors to metal particles. Transmission electron microscopy and X-ray diffraction analyses showed that Pt nanoparticles synthesized with the addition of RTILs are formed as discrete particles with sizes less than 2 nm and a very narrow size distribution, while most of the Pt nanoparticles without the addition of RTILs are highly agglomerated. It was also found that the size of Pt particles can be tailored by controlling the concentration of RTILs. Excellent, uniform dispersion of Pt nanoparticles on carbon supports can be achieved by the addition of RTILs. This approach enables size control of noble metal nanoparticles regardless of the nature of the supports and provides an easy way to investigate the effect of carbon supports on the catalytic activities of supported catalysts.

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