| Summary: | 碩士 === 長庚大學 === 化工與材料工程研究所 === 92 === The purpose of this study is to synthesize nano-scale PPy/Fe3O4 composites in cyclodextrin and investigate their structure, physical properties and applications on the microwave absorption. The conducting and magnetic PPy/Fe3O4 nano-composites were prepared by the co-precipitation method. For X-ray diffraction (XRD) analysis, the main peaks at 2θ = 30.1°, 35.5°, 43.1°, 53.4°, 57.0°, 62.8° are characteristics of Fe3O4. After doping with FeCl3 in CHCl3, the PPy composites still have characteristic peaks of Fe3O4. The characteristic absorption peaks of Fe-O and PPy were found by Infrared spectroscopy (IR). In combine with the result of XRD, it is confirmed that PPy/Fe3O4 composites were successfully prepared. For Brunaure-Emnett-Teller (BET) analysis, the surface area of Fe3O4 powder prepared in cyclodextrin is 2 times of the pure Fe3O4 powder. The particle size of Fe3O4 prepared in cyclodextrin is about 10 nm and the range of size distribution is very narrow as analyzed by Transmission electron microscope (TEM). The increasing of conductivity of PPy/Fe3O4 composites was identified by four-point probe, indicating that the absorption of microwave was also increased. For instance, the reflection loss of PPy/Fe3O4 composites (4 mm thickness) increased from -5 dB to -40 dB after doping. Therefore, it is confirmed that the composites have better microwave absorption capability after doping.
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