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Issue 19, 2012
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Boron carbide nanowires: low temperature synthesis and structural and thermal conductivity characterization

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Abstract

Boron carbide nanowires, a promising class of high temperature thermoelectric nanomaterials, are synthesized by co-pyrolysis of diborane and methane in a low pressure chemical vapor deposition system via the vapor–liquid–solid growth mechanism. Nickel and iron are effective catalytic materials. The synthesis is realized at relatively lower temperatures, with 879 °C as the lowest one. Electron microscopy analysis shows that the as-synthesized nanowires have diameters between 15 and 90 nm and lengths up to 10 μm. The nanowires have single crystalline boron carbide cores and thin amorphous oxide sheaths. Both transverse faults and axial faults with fault planes as {101}h-type are observed, which could provide additional measures to tune the nanowire transport properties for better thermoelectric performance. Measurement of individual boron carbide nanowires reveals that the thermal conductivity is diameter-dependent, which indicates that boundary scattering still provides an effective approach to reduce the wire thermal conductivity for enhanced thermoelectric performance.

Graphical abstract: Boron carbide nanowires: low temperature synthesis and structural and thermal conductivity characterization

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Publication details

The article was received on 28 Sep 2011, accepted on 08 Mar 2012 and first published on 13 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM14857A
Citation: J. Mater. Chem., 2012,22, 9853-9860
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    Boron carbide nanowires: low temperature synthesis and structural and thermal conductivity characterization

    Z. Guan, T. Gutu, J. Yang, Y. Yang, A. A. Zinn, D. Li and T. T. Xu, J. Mater. Chem., 2012, 22, 9853
    DOI: 10.1039/C2JM14857A

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