Controlled synthesis of mesoporous zinc oxide containing oxygen vacancies in low annealing temperature for photoelectrochemical biosensor.

In this work, a mesoporous zinc oxide containing different concentrations of oxygen vacancies (V O) was controlled synthesized via low temperature annealing. XPS, Raman spectroscopy and electron paramagnetic resonance spectroscopy were employed to investigate the changes of V O concentrations following the increase of annealing temperature. According to the experiment, the highest concentration of V O was obtained at the annealing temperature of 350 °C. The relationship between photoelectrochemical biosensor performance and V O concentration was discussed in detail in terms of electrochemical measurements and V O characterization. Results showed that increasing the V O could result in high carrier intensity, active sites and catalytic rate constant. In addition, the performance toward glucose detection could be improved by increasing V O. [ABSTRACT FROM AUTHOR]