Dual Use of Copper-Modified TiO2 Nanotube Arrays as Material for Photocatalytic NH3 Degradation and Relative Humidity Sensing

In this paper, we emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and a relative humidity sensor. The were obtained by anodization titanium layer prepared using radio frequency magnetron sputtering (RFMS) modified with different copper concentrations (0.5, 1, 1.5, 2 M) wet-impregnation method. sample M Cu(NO3)2 solution showed highest efficiency for NH3 photocatalytic degradation most pronounced response in comparison to other studied samples. order investigate structure impact Cu modification, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) used. activity kinetic study ammonia oxidation mini-photocatalytic wind tunnel reactor (MWPT), while sensing was examined impedance (IS). Higher direct consequence increased generation •OH radicals more efficient photogenerated charge separation, which is correlated increase DC conductivity.