Preparation And Properties Of Ferrite/PPy Composites

In this paper,Mg1-xZnxFe2O4(x=0,0.2,0.4,0.6,0.8)and CuxZn1-xFe2P4(x=0.1,0.3,0.5,0.7,0.9)ferrite were prepared by solvent-thermal method.Polypyrrole(PPy)and Cu0.5Zn0.5Fe2O4/PPy composites were prepared by polymerization method.The samples were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),vibrating sample magnetometer(VSM),infrared spectrum and vector network analyzer,The phase composition,morphology,magnetic properties,electromagnetic properties and microwave absorption properties of ferrite,polypyrrole and ferrite/polypyrrole composites were discussed.XRD analysis of Mg1-xZnxFe2O4(x=0,0.2,0.4,0.6,0.8)showed that the prepared Mgi-xZnxFe2O4 is a cubic spinel with high crystallinity.SEM analysis results showed that the addition of zinc ions will promote the growth of particles.When the proportion of Zn2+and Mg2+ions is similar,the particle size was relatively uniform and the dispersion was good.The results of magnetic property analysis showed that Mg1-xZnxFe2O4 had good magnetic property and loss.The results of infrared spectrum analysis showed that the Mg0.4Zn0.6Fe2O4 showed an M-O characteristic peak,indicated that it was a spinel structure,which was consistent with the XRD results.XRD analysis of CuxZn1-xFe2O4(x=0.1,0.3,0.5,0.7,0.9)showed that the diffraction peaks of CuxZn1-_xFe2O4 ferrites synthesized under different molar ratios are consistent with the standard PDF card,and the crystallinity was complete.SEM analysis results showed that when the content of Cu2+increases gradually,the particle size of ferrite powder decreases gradually,reaching about 200nm,and the particle size is evenly distributed.The magnetic property analysis results showed that when x=0.5,that is,Cu0.5Zn0.5Fe2O4 ferrite had a maximum value of 28.53emu/g,and the mangy force reached a maximum value of 98.070e at x=0.9 with the increase of zinc ions.The results of electromagnetic performance show that Cu0.5Zn0.5Fe2O4 has strong magnetic loss capacity and is the most stable.Cu0.5Zn0.5Fe2O4 has the highest dielectric loss capacity.XRD analysis of polypyrrole showed that the prepared substance was polypyrrole(PPy).The results of SEM showed that the optimal process for synthesizing PPy micron line was at CTAB concentration of 0.015mo/L,phosphoric acid concentration of 0.07mol/L and temperature of 0?.The diameter of PPy micron line was about 200nm,the length could reach several microns,and the network structure was connected with each other.SEM results of PPy/Cu0.5Zn0.5Fe2O4 composite material showed that the composite material can also form linear structure,but its morphology is not uniform,and there are also rod structure.XRD analysis results showed that the diffraction peaks of polypyrrole and PPy/Cu0.5Zn0.5Fe2O4 composite materials were consistent with the comparison of PDF cards,and there were no clutter peaks.The results of electromagnetic performance analysis showed that polypyrrole(PPy)has almost no magnetic loss,but has good dielectric loss,while PPy/Cu0.5Zn0.5Fe2O4 composite has not only good dielectric loss,but also good magnetic loss effect and high magnetic property due to the addition of ferrite.The results of microwave absorption analysis showed that the minimum reflectance of polypyrrole reaches-7.3dB when f= 13.9GHz,and that of PPy/Cu0.5Zn0.5Fe2O4 composite material reaches-11.9dB whenf= 13.1GHz,and the composite material has better microwave absorption performance.