alpha-Fe2O3 nanoparticulate films could be formed on the surface of alpha-Fe2O3 hydrosol after aging of the hydrosol or by compressing of the nanoparticles on the sol surface, in. which a three-dimensional ordered structure was constructed by the Langmuir-Blodgett; technique and colloid chemical methods. The structure of the LB film was characterized by AFM, TEM, XPS, and UV-vis spectra and small-angle X-ray diffraction. Gas-sensing measurement shows that the LB film has good sensitivity to alcohols at room temperature,
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