Abstract: For coating SnO2 thin film on the surface of glass fibers to improve the conductivity of glass fibers with good transmittance, the SnO2 sol was prepared by sol-gel method, and was coated on glass fibers by dipping method. The SnO2 thin film was formed onto the surface of glass fibers. The effects of the annealing temperature on the structure of the thin film, the conductive and optical properties of the glass fibers were investigated. X-Ray Diffraction(XRD), Scanning Electron Microscope(SEM)，Atomic Force Microscope(AFM) , Four-Probe Method and Ultraviolet Visible Spectrophotometer were utilized to characterize the structure and morphology of the thin film , the resistivity of glass fibers and the optical property of the thin film. The sol was very stable, and the optimized annealing temperature with 550℃was chosen, the mean particle size of the SnO2 thin film was 17.18nm, the conductivity of glass fibers was 5×10-5Ω·m, at the same time, the transmittance of the thin film was about 88%.

Key words: tin oxide, sol-gel, annealing, crystal grain, resistivity, transmittance