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

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Juekuan Xu, Terry T. Gutu, Timothy Guan, Zhe Yang, Yang Zinn, Alfred A. Li, Deyu
Copyright Year	2012
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.
Starting Page	9853
Ending Page	9860
Page Count	8
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	19
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm14857a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Boron carbide Nanomaterials Diborane Methane Chemical vapor deposition Electron microscope Micrometre Nanowire Thermoelectric materials Thermal conductivity
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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