Electroless deposition of BaTiO3 nanocubes for electrochemical sensing

The BaTiO3 nanocubes are prepared directly on Ti foils through electroless deposition method in composite-hydroxide-melts. Amperometric sensors based on the BaTiO3 nanocubes have been fabricated simply. A trace hydrogen peroxide has been determined by the sensor, indicating a high sensitivity, selectivity and fast response speed for electrochemical detection on the BaTiO3 nanocubes. The sensor with cube size of 200 nm and BaTiO3 layer of 1 μm provides a response current of 116 μA cm−2 and response time of 4 s when each of 0.1 mM H2O2 is added into 0.1 M PBS at pH 7.4. The linear detection of hydrogen peroxide ranges from 5.0 × 10−7 M to 1.1 × 10−3 M (R = 0.999).