Vapor-induced solid-liquid-solid process for silicon-based nanowire growth |
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Authors: | Ji-Guang Zhang Jun Liu Daiwon Choi Chongmin Wang Zimin Nie Larry R Pederson |
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Affiliation: | a Pacific Northwest National Laboratory, Richland, WA 99354, United States b North Dakota State University, Fargo, ND 58102, United States |
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Abstract: | Silicon-based nanowires have been grown from commercial silicon powders under conditions with different oxygen and carbon activities. Nanowires grown in the presence of carbon sources consisted of a crystalline SiC core with an amorphous SiOx shell. The thickness of the SiOx shell decreased as the oxygen concentration in the precursor gases decreased. Nanowires grown in a carbon-free environment consisted of amorphous silicon oxide with a typical composition of SiO1.8. The growth rate of nanowires decreased with decreasing oxygen content in the precursor gases. SiO1.8 nanowires exhibited an initial discharge capacity of ∼1300 mAh g−1 and better stability than those of silicon powders. A vapor-induced solid-liquid-solid (VI-SLS) mechanism is proposed to explain the nanowire growth (including silicon and other metal-based nanowires) from powder sources. In this approach, both a gas source and a solid-powder source are required for nanowire growth. This mechanism is consistent with experimental observations and also can be used to guide the design and growth of other nanowires. |
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Keywords: | Lithium ion batteries Silicon Nanowire Energy storage SiC PHEV |
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