Phosphorus doped TiO2 as oxygen sensor with low operating temperature and sensing mechanism

► This work firstly reports an oxygen sensor based on phosphorus doped TiO2. ► The sensitivity and selectivity of TiO2 are enhanced by phosphorus doping. ► The operating temperature is low, and the response time is short. ► The mechanism of oxygen sensing improvement with phosphorus doping is researched. ► Based on this work, nonmetal doping could be as a new filed for gas sensor.