Effect of annealing temperature on conductive and optical properties of SnO_2 thin film coated on glass fibers

For coating SnO2 thin film on the surface of glass fibers to improve the conductivity of glass fibers with good transmittance,the nano SnO2 sol was prepared by sol-gel method,and was coated on glass fibers by dipping method.The nano SnO2 thin film was formed onto the surface of glass fibers.The effects of the annealing temperature on the structure of the thin film and conductive and optical properties of the glass fibers were investigated.X-ray diffraction,scanning electron microscopy,atomic force microscopy,four-probe method and ultraviolet visible spectrophotometry were utilized to characterize the structure and morphology of the thin film,the resistivity of glass fibers and the transmittance of the thin film,respectively.The results indicated that the sol was very stable,and the optimized annealing temperature was 550 ℃,the mean particle size of the SnO2 thin film was 17.18 nm,the conductivity of glass fibers was 1×10-5 Ω·m,and the transmittance of the thin film was about 88%.