Teflon rods were uniformly covered with SnO2 coatings. They were single phase SnO2 crystals. Chemical reaction proceeded in aqueous solution at 90 degrees C to nucleate and grow SnO2 nanosheets on the surfaces of rods. The coatings consisted of SnO2 nanosheets 100-200 nm in size and 20-40 nm in thickness. Anisotropic crystal growth of SnO2 along the a-axis caused formation of sheet shape crystals. The SnO2 coatings thus had rough surface structures and high surface area of SnO2 c-planes. The process had advantages to produce uniform coatings on various complicated substrates such as curved surfaces of rods. The coating was realized on low-heat resistant polymer Teflon since SnO2 crystallized in the aqueous solutions without high temperature firing.
