以硅藻土为基核采用共沉淀法, 制备Sb-SnO2包覆前驱体, 通过焙烧制备了多孔结构导电复合材料. Sb-SnO2包覆率影响产物导电性、焙烧温度影响Sb-SnO2晶胞参数和晶粒大小, 进而影响产物导阻率. 采用XRD、SEM、TEM、EDS、BET、FT-IR对样品进行了表征, 采用四探针仪测试样品导电性能. 当n(Sn)/n(Sb)=8/1、包覆率为25.8%、700℃焙烧样品电阻率最低为22 Ω.cm, 并具有介孔结构, 孔径为6 nm.
Porous and conductive diatomite composite materials were prepared via the calcination of the Sb-SnO2-coated diatomite precursor derived from the co-precipitation route with diatomite as the substrate. Conductivity of the samples was influenced by the Sb-SnO2 coating ratio. Calcination temperature had an impact on the crystal lattice parameters and grain sizes, hence altering the conductivity and resistivity of the composite materials. The samples were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectrometry (EDS), N2 adsorption-desorption measurement (BET), and Fourier transform infrared spectrometry (FT-IR). The conductive performance of the samples was determined using a Four-Point Probe Meter apparatus. It is shown that the mesoporous (pore diameter = 6 nm) sample with n(Sn)/n(Sb)=8/1 and a Sb-SnO2 coating ratio of 25.8wt% derived from calcination at 700℃ exhibited the lowest resistivity of 22 Ω·cm.
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