将石墨化碳纳米纤维/二氧化硅气凝胶复合材料进行碳热转化，得到碳化硅/二氧化硅纳米复合材料。

Carbothermal transformation of a graphitic carbon nanofiber/silica aerogel composite to a SiC/silica nanocomposite.

作者信息

Lu Weijie, Steigerwalt Eve S, Moore Joshua T, Sullivan Lisa M, Collins W Eugene, Lukehart C M

机构信息

Department of Physics, Fisk University, Nashville, Tennessee 37208, USA.

出版信息

J Nanosci Nanotechnol. 2004 Sep;4(7):803-8. doi: 10.1166/jnn.2004.119.

DOI:10.1166/jnn.2004.119

PMID:15570963

Abstract

Carbon nanofiber/silica aerogel composites are prepared by sol-gel processing of surface-enhanced herringbone graphitic carbon nanofibers (GCNF) and Si(OMe)4, followed by supercritical CO2 drying. Heating the resulting GCNF/silica aerogel composites to 1650 degrees C under a partial pressure of Ar gas initiates carbothermal reaction between the silica aerogel matrix and the carbon nanofiber component to form SiC/silica nanocomposites. The SiC phase is present as nearly spherical nanoparticles, having an average diameter of ca. 8 nm. Formation of SiC is confirmed by powder XRD and by Raman spectroscopy.

摘要

通过对表面增强的人字形石墨碳纳米纤维（GCNF）和Si(OMe)₄进行溶胶 - 凝胶处理，随后进行超临界CO₂干燥，制备出碳纳米纤维/二氧化硅气凝胶复合材料。在氩气分压下将所得的GCNF/二氧化硅气凝胶复合材料加热到1650℃，引发二氧化硅气凝胶基质与碳纳米纤维组分之间的碳热反应，形成SiC/二氧化硅纳米复合材料。SiC相以近乎球形的纳米颗粒形式存在，平均直径约为8nm。通过粉末XRD和拉曼光谱证实了SiC的形成。