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首页> 外文期刊>Journal of Crystal Growth >Growth and characterization of nanostructured β-SiC via carbothermal reduction of SiO_2 xerogels containing carbon nanoparticles
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Growth and characterization of nanostructured β-SiC via carbothermal reduction of SiO_2 xerogels containing carbon nanoparticles

机译：碳热还原含碳纳米颗粒的SiO_2干凝胶的纳米结构β-SiC的生长和表征

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摘要

Sol--gel route was used to prepare SiO_2 xerogels containing carbon nanoparticles. Three kinds of β-SiC nanostructures were obtained by carbothermal reduction of the xerogels under different conditions. XRD and IR studies show that the powders, obtained from carbothermal reduction at l650℃ for 2.5 h in static argon atmosphere, are β-SiC. TEM reveals that the powders are nanoparticles with diameters ranging from 30 to 100 nm. The specific surface area of the powders are 15.7 m~2/g. TEM, SAED and EDX show that the products, synthesized by carbothermal reduction at 1650℃ for 1.5 h, and followed by heating to 1800℃, holding for 30 min in flowing argon atmosphere, are nanowires that consist of 10- to 25-nm-diameter crystalline β-SiC cores surrounded by amorphous SiO_2 sheathes with outer diameters of between 20 and 70 nm. While TEM and SAED demonstrate that the products, formed by carbothermal reduction at l650℃ for 2.5 h in flowing argon atmosphere, are bare SiC nanowires with diameters in the range of 15-30 nm.
机译：采用溶胶-凝胶法制备了含碳纳米颗粒的SiO_2干凝胶。通过在不同条件下对凝胶进行碳热还原得到了三种β-SiC纳米结构。 XRD和IR研究表明，在静态氩气气氛下于1650℃碳热还原2.5h得到的粉末为β-SiC。 TEM显示粉末是直径为30至100nm的纳米颗粒。粉末的比表面积为15.7m 2 / g。 TEM，SAED和EDX表明，在1650℃下碳热还原1.5 h，然后加热到1800℃，在流动的氩气气氛中保持30分钟，所合成的产物是10至25 nm纳米线。直径为20到70 nm的无定形SiO_2护套包围的结晶β-SiC核。 TEM和SAED证明，在流动的氩气中，在1650℃下碳热还原2.5 h所形成的产物是裸露的SiC纳米线，直径在15至30 nm范围内。

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