Study the stability of CuO nanowires coated PIPD fiber in acid solution

Abstract Growing CuO nanowires on rigid rod polymeric PIPD or poly-pyridobisimidazole fibers provided significant improvement of mechanical and interfacial performance. However, the stability of this coated layer in acid solution is not quite lucid. Herein we investigated the influence of nitric acid solution on the stability of the CuO NWs. The result showed that even after soaking the coated samples for 30 h, still the PIPD fiber shows great mechanical and interfacial behavior. The tensile strength and the interface shear strength (IFSS) of the sample immerged for 48 h were decreased by only 17% and 20% respectively, and the Scanning electron microscope images support the obtained result and showed great stability of the coated layer.