In-situ growth of micro-cubic Prussian blue-TiO₂ composite film as a highly sensitive H₂O₂ sensor by aerosol co-deposition approach

Assisted by the aerosol co-deposition approach, Prussian blue (PB)-TiO₂ composite film can be in-situ formed in one step. The architecture of this film is constructed by two layers: PB-TiO₂ nano-particles as a ground layer and individual PB micro-cubes as a top layer. Together with the strong electrocatalytic ability from regular PB morphology, TiO₂ can denote its high catalysis in H₂O₂ detection attributed by the extinction of band gap since the combination of PB. Under a low operation potential -0.05V, this sensor exhibits an ultrasensitive ability (1726.8μAmM^-1cm^-2), stability and low detection limit (1.5μM) in H₂O₂ analysis. The application of this composite material is hopeful to extend in complex physiological analysis, and the preparation approach is promising to extend in more composite materials in-situ synthesis.