Thermo-electrical properties of carbon/silicon carbide nanofibers prepared by carbothermal reduction

摘要

In this study, Electrospun carbon fibers were prepared with PAN as a carbon source, multi walled carbon nanotube (MWCNT) as an agent for inducing excellent conductivity and dimethoxydimethylsilane (DMDMS) as silicon carbide for inducing high thermal/oxygen resistance. The carbon nanofibers were made by electrospinning, thermal oxidation and carbothermal reduction. The characterization of samples was carried out by using TGA, sheet resistance and probe station analysis. The values of IDT and T_(max) of electrospun nano CFs are a little increased by SiC and CNT addition, It can be confirmed that the thermal stability of the SiC and CNT additions is a little increased, which is attributed to excellent thermal stability of SiC and thermal conductivity of MWCNTs introduced in CFs. The sheet resistance of PAN based electrospun nano carbon fibers are around 2.1 ii/sq. The highest electrical conductivity was observed in case of CF-SiC/CNT showing around 1.0Ω/sq in sheet resistance. This result of sheet resistance is due to the increase in carrier mobility with incorporation of MWCNTs into PAN based nano CFs.