A study on synthesis and characterization of the core-shell materials of Mn1-xZnxFe2O4-polyaniline

作者：Lee Shih Pong; Chen Yi Jen; Ho Chi Man; Chang Chang Ping; Hong Yaw Shun^*

来源：Materials Science and Engineering B-Solid State Materials for Advanced Technology, 2007, 143(1-3): 1-6.

DOI：10.1016/j.mseb.2007.06.029

• core-shell material
• spinel ferrite
• spinel-polyaniline hybrid
• electrical conductivity
• magnetization
• X-ray diffraction

Microwave absorbents with core-shell structure of Mn1-xZnxFe2O4-polyaniline have been synthesized by the polymerization of aniline in the aqueous solution of aniline in the presence of surfactant NaDS and the nano-particle size powder of Mn1-xZnxFe2O4. The nano-particle size of Mn1-xZnxFe2O4 was prepared with the method of self-propagation combustion of the aqueous sol-gel. X-ray powder diffraction of ferrites indicated that the structure of core materials is spinel structures with lattice constants around 8.44-8.40 angstrom. SEM and TEM photographs show that the particle size of core material are around 100-200 nm. After coating with polyaniline, the particle size of the core-shell of ferrite-polyaniline has grown up to 400-800 nm. The conductivity of the core materials ferrites and of the core-shell materials of the ferrite-polyaniline measured by the four-point probe resistivity are 10(-5) Omega(-1) cm(-1) and 10(-1) Omega(-1) cm(-1), respectively. The conductivity of the core-shell materials increase with the increasing of the amount of polyaniline in the resulting products. The magnetic hysteresis loops of materials investigated with VSM indicate that the saturated magnetization (M-s) of pure spinel ferrites of Mn1-xZnxFe2O4 increase with the x value up to 47.01 emu/g for Mn0.50Zn0.50Fe2O4, but the M-s values of the core-shell materials decrease with the amount of polyaniline (PAN) in the core-shell ferrite-polyaniline materials. The composite specimens of the core-shell ferrite-polyaniline and epoxide resin have bandwidth microwave absorption of the reflection lose -5 dB to -10 dB at the frequency between 4.5 GHz and 6.8 GHz were also observed by the network analyzer.

• 出版日期2007-10-25
• 单位中国人民解放军国防大学