SiC/C aerogels from biphenylene-bridged polysilsesquioxane/clay mineral nanocomposite aerogels

被引：21

作者：

Zirakjou, Abbas ^{[1
]}

Kokabi, Mehrdad ^{[2
]}

机构：

[1] Tarbiat Modares Univ, Dept Mat Engn, Nanomat Grp, POB 14115-143, Tehran, Iran

[2] Tarbiat Modares Univ, Fac Chem Engn, Dept Polymer Engn, POB 14115-114, Tehran, Iran

来源：

CERAMICS INTERNATIONAL | 2020年 / 46卷 / 02期

关键词：

Sol-gel processes; Nanocomposites; Porosity; SiC; Aerogel; GROWTH-MECHANISM; NANOWIRES; CARBON; NANOSTRUCTURES; SEMICONDUCTOR; REDUCTION; XEROGELS;

D O I：

10.1016/j.ceramint.2019.09.204

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work, SiC/C aerogels with a high specific surface area (> 1000 m(2)*g(-1)) and high porosity (> 90%) synthesized through carbothermal reduction of biphenylene-bridged polysilsesquioxane (BP)/clay mineral nanocomposite aerogels. BP/clay mineral nanocomposite aerogels first prepared via sol-gel method followed by supercritical CO2 (ScCO2) drying process, then used to form SiC/C aerogels by intermolecular carbothermal reduction. The exfoliated BP/clay mineral nanocomposite aerogel caused the growth of several millimeters long SiC nanowires (NWs) with a diameter in the range of 30-90 nm on the surface of SiC/C monolith aerogel and worm-like SiC nanostructures in the interior of SiC/C aerogel. Digital microscope, XRD, FE-SEM, FT-IR, TEM, HRTEM, SAED, HAADF-STEM, EDS, BET, and mercury porosimetry techniques employed to fully characterize the obtained products. Al2O3-assisted vapor-solid (VS) mechanism proposed for the growth mechanism of SiC NWs on the surface of aerogels.

引用

页码：2194 / 2205

页数：12

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