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  • Pt Nanoparticles Sensitized Ordered Mesoporous WO<inf>3</inf> Semiconductor: Gas Sensing Performance and Mechanism Study

    Author(s)
    Ma, J
    Ren, Y
    Zhou, X
    Liu, L
    Zhu, Y
    Cheng, X
    Xu, P
    Li, X
    Deng, Y
    Zhao, D
    Griffith University Author(s)
    Zhao, Dongyuan
    Year published
    2018
    Metadata
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    Abstract
    In this study, a straightforward coassembly strategy is demonstrated to synthesize Pt sensitized mesoporous WO3 with crystalline framework through the simultaneous coassembly of amphiphilic poly(ethylene oxide)-b-polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursors. The obtained WO3/Pt nanocomposites possess large pore size (≈13 nm), high surface area (128 m2 g−1), large pore volume (0.32 cm3 g−1), and Pt nanoparticles (≈4 nm) in situ homogeneously distributed in mesopores, and they exhibit excellent catalytic sensing response to CO of low concentration at low working temperature with good ...
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    In this study, a straightforward coassembly strategy is demonstrated to synthesize Pt sensitized mesoporous WO3 with crystalline framework through the simultaneous coassembly of amphiphilic poly(ethylene oxide)-b-polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursors. The obtained WO3/Pt nanocomposites possess large pore size (≈13 nm), high surface area (128 m2 g−1), large pore volume (0.32 cm3 g−1), and Pt nanoparticles (≈4 nm) in situ homogeneously distributed in mesopores, and they exhibit excellent catalytic sensing response to CO of low concentration at low working temperature with good sensitivity, ultrashort response-recovery time (16 s/1 s), and high selectivity. In-depth study reveals that besides the contribution from the fast diffusion of gaseous molecules and rich interfaces in mesoporous WO3/Pt nanocomposites, the partially oxidized Pt nanoparticles that chemically and electronically sensitize the crystalline WO3 matrix, dramatically enhance the sensitivity and selectivity.
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    Journal Title
    Advanced Functional Materials
    Volume
    28
    Issue
    6
    DOI
    https://doi.org/10.1002/adfm.201705268
    Subject
    Physical sciences
    Chemical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/385563
    Collection
    • Journal articles

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