期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 19, 期 5, 页码 3948-3954出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp07457j
关键词
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资金
- National Natural Science Foundation of China [51672144, 51572137, 51502149, 51272117]
- Natural Science Foundation of Shandong Province [ZR2015PE003, ZR2013EMQ006]
- Research Award Fund for Outstanding Young Scientists of Shandong Province [BS2013CL040]
- Application Foundation Research Program of Qingdao [15-9-1-28-jch, 14-2-4-29-jch]
- Shandong Province Taishan Scholar engineering under special funding
- Overseas Taishan Scholar engineering under special funding
SiC@SiO2 nanowires, as a functional nanocomposite, have attracted widespread attention due to their fascinating performance and broad application prospect. However, the low-cost, high yield preparation of large-scale SiC@SiO2 nanowires is still a bottleneck, which hinders their industrial application. Herein, a carbothermal reduction strategy has been developed to synthesize SiC@SiO2 nanowires, which breaks through the handicap of the traditional growth pattern that uses the aid of a substrate. Systematic characterization results illustrate that the yield of the as-obtained products greatly depends on the heating rate, and ten-gram scale SiC@SiO2 nanowires (similar to 27.2 g) composed of a cubic beta-SiC core and homogeneous amorphous SiO2 coating are achieved under the optimum process parameters. The in situ mechanisms of expansion-insertion-growth and inhibition of expansion-package-obstruction are proposed to rationally interpret the growth process of SiC@SiO2 nanowires and the effect of various heating rates, respectively. Furthermore, the SiC@SiO2 nanowires display violet-blue photoluminescence and electromagnetic wave absorption properties. This study not only provides some beneficial suggestions for the commercial production of SiC@SiO2 nanowires, but also reveals promising applications of SiC@SiO2 nanowires in the optical and electromagnetic shielding fields. Moreover, the developed novel in situ growth mechanism enriches the growth theory of one-dimension nanomaterials and offers inspiration for their industrial-scale production.
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