Effects of Surface Nitrification on Thermal Conductivity of Modified Aluminum Oxide Nanofibers-Reinforced Epoxy Matrix Nanocomposites

Aluminum oxide ( Al₂O₃ ) nanofibers were treated thermally under an ammonia ( NH₃ ) gas stream balanced by nitrogen to form a thin aluminum nitride (AlN) layer on the nanofibers, resulting in the enhancement of thermal conductivity of Al₂O₃ /epoxy nanocomposites. The micro-structural and morphological properties of the NH₃ -assisted thermally-treated Al₂O₃ nanofibers were characterized by X-ray diffraction (XRD) and atomic force microscopy (AEM), respectively. The surface characteristics and pore structures were observed by X-ray photoelectron spectroscopy (XPS), Zeta-potential and N₂ /77 K isothermal adsorptions. From the results, the formation of AlN on Al₂O₃ nanofibers was confirmed by XRD and XPS. The thermal conductivity (TC) of the modified Al₂O₃ nanofibers/epoxy composites increased with increasing treated temperatures. On the other hand, the severely treated Al₂O₃ /epoxy composites showed a decrease in TC, resulting from a decrease in the probability of heat-transfer networks between the filler and matrix in this system due to the aggregation of nanofiber fillers.