Flake-like Cu2O on TiO2 nanotubes array as an efficient nonenzymatic H2O2 biosensor
Abstract This work provides a new method for fabrication of the flake-like Cu 2 O/TiO 2 nanotubes array (TNA) electrode as a H 2 O 2 sensor. The flake-like Cu 2 O/TNA electrode was successfully constructed by potentiostatic electrodeposition combining subsequent cyclic voltammetry (CV) technology in NaOH solution. The catalytic performance of the sensor was studied in 0.1M phosphate buffer (PBS, pH=7.4). It was found that the flake-like Cu 2 O/TNA electrode displayed a good catalytic performance towards the reduction of H 2 O 2 with a response time of 4s, a wide linear dependence on a concentration of H 2 O 2 from 0.5mM to 8mM, a good sensitivity of 412.11μAcm −2 mM −1 and a detection limit of 90.5μM at a working voltage −0.40V (vs. Hg/Hg 2 Cl 2 ). The electrocatalytic mechanism of the flake-like Cu 2 O/TNA electrodes was also proposed. Highlights The flake-like Cu 2 O/TiO 2 electrode has been fabricated by a combination method. The Cu 2 O/TiO 2 displayed an efficient nonenzymatic H 2 O 2 biosensor property. The flake-like morphology and specific crystal faces provide a good performance. Graphical abstract A flake-like cuprous oxide/TiO 2 nanotubes array (TNA) hybrid film was firstly constructed and displayed a good sensor performance towards the detection of H 2 O 2 . [DISPLAY OMISSION]
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