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Volume 190, 2016
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Formation of Si nanowires by the electrochemical reduction of SiO2 with Ni or NiO additives

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Abstract

Various morphologies of silicon nanowires (SiNWs) were successfully prepared by the electrochemical reduction of silica mixed with different additives (Au, Ag, Fe, Co, Ni, and NiO, respectively). Straight SiNWs were extensively obtained by the electro-reduction of porous Ni/SiO2 blocks in molten CaCl2 at 900 °C. The SiNWs had a wide diameter distribution of 80 to 350 nm, and the Ni–Si droplets were found on the tips of the nanowires. The growth mechanism of SiNWs was investigated, which could reveal that the nano-sized Ni–Si droplets formed at the Ni/SiO2/CaCl2 three-phase interlines. Based on the mechanism proposed, NiO particles with sub-micrometer size were selected as the additive, and straight SiNWs with diameters of 60 to 150 nm were also prepared via the electrochemical process.

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Publication details

The article was received on 14 Dec 2015, accepted on 22 Jan 2016 and first published on 22 Jan 2016


Article type: Paper
DOI: 10.1039/C5FD00222B
Citation: Faraday Discuss., 2016,190, 433-449
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    Formation of Si nanowires by the electrochemical reduction of SiO2 with Ni or NiO additives

    S. Fang, H. Wang, J. Yang, B. Yu and S. Lu, Faraday Discuss., 2016, 190, 433
    DOI: 10.1039/C5FD00222B

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