Abstract
In this work, we have used a micro-arc oxidation technique operating in the AC mode to prepare a TiO2-SnO2 film sensitive to pH on a Ti substrate. The microstructure and elemental and material composition of the film was studied. The results show that a porous structure formed on the film surface. XRD indicated that the film contained hydrophilic amorphous TiO2, and XPS showed the formation of oxide SnO2 in the film. TiO2-SnO2/0.5 films doped with 0.5 g/L Na2SnO3 had excellent pH-sensing properties. Performance tests showed that for pH in the range 2–12, the TiO2-SnO2/0.5 films had a sensitivity of 64.60 mV/pH, as well as fast response times, low hysteresis, good stability, and resistance to temperature and interference by ionic impurities. The prepared TiO2-SnO2/0.5 films were used with a commercial pH meter to detect several common fluids with an accuracy of ± 0.09 pH.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
