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Issue 4, 2019
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Ultralow thermal conductivity in graphene–silica porous ceramics with a special saucer structure of graphene aerogels

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Abstract

In our work, a unique saucer structure of graphene aerogels in the form of graphene sheets (nearly 10 μm) is designed to grow them in situ on hollow silica spheres that are connected to their neighbors by C–O and C–Si bonds after fabrication by spark plasma sintering (SPS). The graphene–silica porous ceramics (GSPCs) are characterized by Fourier transform infrared (FTIR), Raman and X-ray photoelectron (XPS) spectroscopies. The mechanism of metal-catalyst-free method for the direct synthesis of graphene aerogels in the form of large-size graphene sheets on hollow spheres is studied. Compared to other ceramics, GSPCs have an ultralow thermal conductivity (0.054–0.057 W m−1 K−1 at room temperature (RT) and 0.038 W m−1 K−1 at 90 K) and a relatively high compressive strength (7.4 MPa), which depends on the special saucer structure of the graphene aerogels and their high porosity (89.63%). We additionally find that the temperature dependence of the thermal conductivity is altered by the content of graphene aerogels.

Graphical abstract: Ultralow thermal conductivity in graphene–silica porous ceramics with a special saucer structure of graphene aerogels

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Publication details

The article was received on 30 Oct 2018, accepted on 11 Dec 2018 and first published on 12 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10426C
Citation: J. Mater. Chem. A, 2019,7, 1574-1584

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    Ultralow thermal conductivity in graphene–silica porous ceramics with a special saucer structure of graphene aerogels

    J. Fan, S. Hui, T. P. Bailey, A. Page, C. Uher and F. Yuan, J. Mater. Chem. A, 2019, 7, 1574
    DOI: 10.1039/C8TA10426C

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