Role of interface on electrical conductivity of carbon nanotube/alumina nanocomposite

详细信息    查看全文

• 作者：Soumya Sarkar ; Probal Kr. Das
• 关键词：B. Electron microscopy ; B. Interfaces ; B. Nanocomposites ; C. Electrical conductivity
• 刊名：Ceramics International
• 出版年：March, 2014
• 年：2014
• 卷：40
• 期：2
• 页码：2723-2729
• 全文大小：2334 K

文摘

Interface of multiwalled carbon nanotube (MWCNT)/alumina (Al₂O₃) nanocomposites have been studied using TEM. At low sintering temperature (T_sin=1500 掳C), a 3-5 nm thick amorphous interface region was noticed. Nanocomposite sintered at 1700 掳C possessed a well-defined graphene layer coating on matrix grains as the interface between CNT and Al₂O₃. A mechanism of such layered interface formation has been proposed. No traceable chemical reaction product was observed at the interface even after sintering at 1700 掳C. It was noticed that while DC electrical conductivity (蟽_DC) of 1500 掳C sintered 2.4 vol% MWCNT/Al₂O₃ nanocomposite was only~0.02 S/m, it raised to ~21 S/m when sintering was done at 1700 掳C. Such 10³ times increase in 蟽_DC of present nanocomposite at a constant CNT loading was not only resulted from the exceptionally high electron mobility of CNT but the well-crystallized graphene interface on insulating type Al₂O₃ grains also significantly contributed in the overall increase of electrical performance of the nanocomposite, especially, when sintering was done at 1700 掳C.