| Summary: | 碩士 === 明新科技大學 === 化學工程與材料科技系碩士班 === 105 === In this study, zinc oxide / polyacrylonitrile (ZnO / PAN) composite nanofiber material for absorbing electromagnetic waves was prepared by electrospinning. In this experiment, polyacrylonitrile (PAN) was mixed with dimethylformamide (N, N-dimethyformamide, DMF) solution by changing the four process parameters: PAN concentration, collecting plate voltage, injection And the effects of these parameters on the morphology and diameter of PAN nanofibers were discussed；However, ZnO / PAN composite nanofibers were prepared to add ZnO nanopowders at concentrations of 10 wt%, 15 wt%, 20 wt% and 25 wt%, respectively. And then the characteristics of electromagnetic wave absorption were further studied. The fiber morphology and diameter were observed by scanning electron microscopy. The weight change of the sample was observed by thermogravimetric analysis. The crystal structure was identified by X-ray diffraction (XRD) Electron microscopy observation of microstructure and grain size and vector network analyzer, the radar wave band (3-18 GHz) electromagnetic characteristics.
The experimental results show that nanofibers with uniform diameter can be obtained by the concentration of PAN nanofiber solution at the concentration of 10 wt%, the voltage of 20 kV, the distance of 20 cm and the injection rate of 1.5 mL / hr.The addition of ZnO nanometer powder concentration is different, the higher the concentration will make the fiber agglomeration, fiber diameter becomes different; At room temperature, the maximum reflectance loss is 26.09 dB at 13.19 GHz when the thickness of the absorbing material is 10 mm, and the maximum reflection loss value is observed to move towards high frequency with the carbonization temperature after adding ZnO. , The reflection loss is less than -10dB and the bandwidth is 3.4 GHz .
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