Preparation, Electromagnetic Characteristics and Microwave Absorption Behavior of Silver/Ni-Zn Ferrite/Polyacrylonitrile-Based Carbon Electrospun Composite Nanofiber Absorbers

• Main Authors: Shen,Yu-Siang, 沈郁翔
• Other Authors: Hsieh,Tar-Hwa
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/2m79a5

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 104 === In this study, silver (Ag)/Ni-Zn-Fe (NZF) ferrite/polyacrylonitrile (PAN) nanofibers (NFs) were prepared by electrospinning, followed by stabilization and carbonization to produce Ag/NZF ferrite/PAN-based carbon electrospun composite (Ag/NZF/C) NFs, in which PAN behaved as the polymeric matrix, hexadecyl-trimethyl-ammonium bromide as the surfactant, dimethylformamide (DMF) as the solvent and reductant, AgNO3 as the precursor of silver, NZF ferrite was synthesized by the combustion method (BNZF-9 can further obtained by calcinated at 900℃and followed by ball milling), and Ag nanoparticle was prepared by in-situ reduction of AgNO3 in combination with the pyrolysis process (i.e., 280, 700, 800 and 900℃ under nitrogen atmosphere). The structure of composites is identified by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, wide angle X-ray diffraction (WAXD). Morphology features of composites are characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). Electromagnetic properties and microwave absorption behavior of Ag/BNZF-9 ferrite/carbon composite NF/epoxy absorbers (NF as absorbers and epoxy as matrix) is studied by superconductor quantum interference device (SQUID) and microwave vector network analyzer (VNA). As for electromagnetic characteristics analysis, the values of loss dielectric (ε''), loss magnetic (μ'') are increased with increasing the carbonized temperature. As for microwave absorption analysis, in the range of 2-18 GHz, specimen is 3 mm, the maximum value of reflection loss (RLmax) of Ag/BNZF-9/C-PAN NF is significantly higher than that of BNZF-9/C-PAN NF, which is attributed the scattering effect of Ag nanoparticles. At 800℃, values of RLmax and the maximum absorbance (A%) of Ag/BNZF-9/C-PAN NFs can reach as high as -14.41 dB and 96 %, respectively.