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Alkali solution combined with silica coupling agent were used to modify the surface of polyimide in order to improve adhesion between inorganic coating and polyimide substrate. After surface treatment by NaOH and γ-aminopropyltriethoxysilane (APTES), the water contact angle of polyimide substrate reduced greatly and the SnO2/SiO2 coating was easily formed on it via sol-gel method. The optical transmittance...