Preparation And Electromagnetic Properties Of PZT/NI Core-shell Composite Nanoparticles

As we know, magnetic metal nanoparticle is a significant part in microwave absorption,which has been extensive used in field of radar stealthy. In order to increase theelectromagnetic properties of electromagnetic and microwave absorption, it is necessary forthe magnetic metal nanoparticles to be a magnetic material with high magnetic loss andelectromagnetic matching properties. However, to increase the electromagnetic matchingproperties of magnetic metal nanoparticles is an difficulty nowadays. Therefore, to solvethis problem, the Ni nanoparticles were selected as the research object. And Ni compositenanoparticles were prepared by in-situ reaction. To increase the electromagnetic propertiesof electromagnetic and microwave absorption, the preparing process of compositenanoparticles which could affect the compositions and thickness of the shell wasinvestigated.Firstly, the material microstructure and anti-oxidant ability with the differentpreparation process was investigated. After treated by aqueous ammonium solution, Ninanoparticles first obsorbed the OH, and then reacted with PZT precursor solution. So aPZT shell with a10~15nm thickness was obtained. The high frequency dielectric constant,residual magnetization and the oxidation resistance temperature of Ni compositenanoparticles with coating PZT has been reduced, and the magnetic loss of compositenanoparticles has been increased.Then, the influence of different PH to PZT/Ni composite nanoparticles wasinvestigated. The pH was adjusted by the addition of aqueous ammonium solution. Byadjusting the PH, the magnetic loss reached to0.99and reflection loss reached to-32.29dBin the frequency of10GHz. Based on the adjusting of the PH of aqueous ammoniumsolution, the chelating agent and the concentration of dropping water were studied. Byadding HNO3and adjusting the concentration of dropping water, the magnetic loss andelectromagnetic matching properties has been improved. When adding HNO3and heconcentration of dropping water is0.02mol/L, the properties of Ni composite nanoparticleshas been best. The magnetic loss reached to0.99and reflection loss reached to-32.29dB inthe frequency of10GHz.