Perovskite-SrTiO3/TiO2/PDA as photoelectrochemical glucose biosensor

The complexity of the biological sample to be tested requires the sensor to have a wide monitoring range, accurate selectivity, and excellent environmental tolerance. Here, we report a new strategy of in situ transformation of perovskite to form a heterojunction and combined with bioactive enzyme protective substances, thereby achieving a collection of multiple sensing properties. Through in situ conversion of TiO2 to SrTiO3 to form a heterojunction to provide high oxidation activity and protection for GOx through PDA, the TiO2/SrTiO3/ PDA/GOx biosensor achieves an ultra-wide linear detection range of 0-32 mM. Such a range can effectively monitor the physical condition of people with high blood sugar levels (above 20 mM). Good stability, antiinterference, environmental tolerance, and accurate human blood detection all prove the excellent sensing performance and practical application potential of the TiO2/SrTiO3/PDA/GOx biosensor.