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Materials 2018, 11(5), 766; https://doi.org/10.3390/ma11050766

Tunable Synthesis of SiC/SiO2 Heterojunctions via Temperature Modulation

1
Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, Zhengzhou 450052, China
2
School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou 450000, China
*
Authors to whom correspondence should be addressed.
Received: 23 April 2018 / Revised: 7 May 2018 / Accepted: 7 May 2018 / Published: 10 May 2018
(This article belongs to the Special Issue High Temperature Ceramic Materials)
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Abstract

A large-scale production of necklace-like SiC/SiO2 heterojunctions was obtained by a molten salt-mediated chemical vapor reaction technique without a metallic catalyst or flowing gas. The effect of the firing temperature on the evolution of the phase composition, microstructure, and morphology of the SiC/SiO2 heterojunctions was studied. The necklace-like SiC/SiO2 nanochains, several centimeters in length, were composed of SiC/SiO2 core-shell chains and amorphous SiO2 beans. The morphologies of the as-prepared products could be tuned by adjusting the firing temperature. In fact, the diameter of the SiO2 beans decreased, whereas the diameter of the SiC fibers and the thickness of the SiO2 shell increased as the temperature increased. The growth mechanism of the necklace-like structure was controlled by the vapor-solid growth procedure and the modulation procedure via a molten salt-mediated chemical vapor reaction process. View Full-Text
Keywords: SiC/SiO2 heterojunctions; chemical vapor reaction; fiber; molten salt-mediated; photoluminescence SiC/SiO2 heterojunctions; chemical vapor reaction; fiber; molten salt-mediated; photoluminescence
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Li, W.; Jia, Q.; Yang, D.; Liu, X. Tunable Synthesis of SiC/SiO2 Heterojunctions via Temperature Modulation. Materials 2018, 11, 766.

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