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仪器网/ 行业应用/ 解决方案/ Electrochemical synthesis and characterization of Ti

Electrochemical synthesis and characterization of Ti

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Here, we report the electrochemical synthesis of TiO2 nanoparticles (NPs) using the potentiostat
method. Synthesized particles have been characterized by using x-ray diffraction (XRD)
studies, atomic force microscopy (AFM) and scanning electron microscopy (SEM). The results
revealed that the TiO2 film produced was mainly composed of rutile and that the particles are of
a size in the range of 100 ± 50 nm. TiO2 NPs were used for the modification of a screen printed
carbon electrode (SPE). The resulting TiO2 film coated SPE was used to immobilize flavin
adenine dinucleotide (FAD). The flavin enzyme firmly attached onto the metal oxide surface
and this modified electrode showed promising electrocatalytic activities towards the reduction
of hydrogen peroxide (H2O2) in physiological conditions. The electrochemistry of FAD
confined in the oxide film was investigated. The immobilized FAD displayed a pair of redox
peaks with a formal potential of −0.42 V in pH 7.0 oxygen-free phosphate buffers at a scan rate
of 50 mV s−1. The FAD in the nanostructured TiO2 film retained its bioactivity and exhibited
excellent electrocatalytic response to the reduction of H2O2, based on which a mediated
biosensor for H2O2 was achieved. The linear range for the determination of H2O2 was from
0.15 × 10−6 to 3.0 × 10−3 M with the detection limit of 0.1 × 10−6 M at a signal-to-noise ratio
of 3. The stability and repeatability of the biosensor is also discussed. 扫描探针显微镜(SPM/AFM/STM)
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