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首页> 外文期刊>RSC Advances >The influence of carbon nanotubes and graphene oxide sheets on the morphology, porosity, surface characteristics and thermal and electrical properties of polysiloxane derived ceramics
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The influence of carbon nanotubes and graphene oxide sheets on the morphology, porosity, surface characteristics and thermal and electrical properties of polysiloxane derived ceramics

机译：碳纳米管和氧化石墨烯片对聚硅氧烷衍生陶瓷的形貌，孔隙率，表面特性以及热电性能的影响

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摘要

Graphene oxide (GO) and multi-walled carbon nanotubes (MWCNT) were incorporated into a SiOC composite ceramic matrix using a simple roll-mixing method followed by thermal cross-linking and pyrolysis. The structure, morphology, porosity, surface characteristics, and thermal properties of polysiloxane are analysed using scanning electron microscopy, BET specific surface area, mercury intrusion porosimetry, water vapour and n-heptane adsorption, and Raman spectroscopy, respectively. The electrical conductivity, conduction mechanism, and percolation behavior of the composite ceramics are investigated by electrical impedance spectroscopy in the temperature range of 25–250 °C. Free-rising composite ceramic foams are generated, incorporating both nanofillers into the SiOC ceramic matrix. Both nanofillers show a positive effect on the thermal stability of the SiOC ceramics. The room temperature DC conductivity value of pure SiOC ceramics shows ～2.97 × 10?9 S cm?1, which increases by three to four orders of magnitude after the incorporation of 5 wt% conductive nanofillers (～2.5 × 10?6 S cm?1 for 5 wt% GO and ～2.08 × 10?5 S cm?1 for 5 wt% MWCNT). The calculated activation energy from the Arrhenius plot for composite ceramics is found to be lower (0.10 eV for 5 wt% GO and 0.07 eV for 5 wt% MWCNT) compared to the same SiOC ceramics without nanofillers (0.22 eV). The conduction mechanism studies of composite ceramics suggest a non-Debye type distribution of relaxation in SiOC. Thus the nanofiller-enhanced SiOC ceramics are highly promising materials for rechargeable batteries, high-temperature fuel cells, gas sensors, display devices etc.
机译：氧化石墨烯（GO）和多壁碳纳米管（MWCNT）使用简单的辊混法并随后进行热交联和热解，并入到SiOC复合陶瓷基体中。使用扫描电子显微镜，BET比表面积，压汞法，水蒸汽和 n 庚烷吸附以及拉曼光谱分析聚硅氧烷的结构，形态，孔隙率，表面特性和热性能。分别。通过在25–250°C的温度范围内的电阻抗光谱法研究了复合陶瓷的电导率，传导机理和渗透行为。产生自由上升的复合陶瓷泡沫，将两种纳米填料都掺入到SiOC陶瓷基体中。两种纳米填料都对SiOC陶瓷的热稳定性产生积极影响。纯SiOC陶瓷的室温直流电导率值为〜2.97×10 ？9 S cm ？1 ，掺入5 wt％的导电纳米填料（〜2.5×10 ？6 S cm ？1 < / sup> 用于5 wt％的GO和〜2.08×10 ？5 S cm ？1 对于5wt％的MWCNT）。与没有纳米填料的相同SiOC陶瓷（0.22 eV）相比，由Arrhenius曲线得出的复合陶瓷的活化能更低（对于5 wt％的GO为0.10 eV，对于5wt％的MWCNT为0.07 eV）。复合陶瓷的传导机理研究表明，SiOC中弛豫的非德拜型分布。因此，纳米填料增强的SiOC陶瓷是用于可充电电池，高温燃料电池，气体传感器，显示设备等的极有前途的材料。

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