利用滴定水解法制备了Fe3O4纳米颗粒,经XRD和漫反射吸收谱分析,Fe3O4晶粒粒径约为18nm,从紫外至近红外(200～3000nm)均有很强的光吸收。纳米Fe3O4有明显的负磁阻和湿敏效应,其阻抗随磁感应强度和湿度的增大而减小。
The Fe3O4 magnetic nano-articles prepared by the titration hydrolyzation method were studied with X-ray diffration(XRD), UV-Vis diffusive reflectance
spectrum(DRS), Magnetoresistance measurement and digital bridge LCR. The results show that the Fe3O4 magnetic particles have strong absorptions in the rang
from 250nm to 3000nm；the average diameter of the Fe3O4 nano-particles is about 18nm. The Fe3O4 granular film has obvious negative magnetoresistivity
effect and humidity sensitive character. The impedance of the Fe3O4 nano-particles decreases with increasing magnetic induction and humidity respectively.
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