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Free-standing TiO2 nanotube array membranes are mounted in the active coupling gap of a planar ring-type microwave resonator with f0 of 5.5 GHz and Q of 220. When illuminated by ultraviolet radiation, the S-parameters of the resonator vary as a function of time due to changes in the dielectric constant and electrical conductivity of the membranes, which in turn occur due to the Alling of trap states...
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