Abstract
We report the fabrication of silver nanoparticles evenly imbedded into TiN submicrospheres via one-pot solvothermal reaction and subsequent nitridation for electrochemical detecting of hydrogen peroxide. The precursor of TiO2 submicrospheres and high dispersion of silver nanoparticles are regulated by the alcoholysis of tetrabutyl titanate and reducibility of enol in vitamin C. The ion nitriding promoted the conductivity and micro-nano porous structure on the surface of TiN submicrospheres, which increase the dispersity of silver nanoparticles and make contributions to avoid aggregations. More importantly, the electrochemical response of Ag-TiN submicrospheres to H2O2 was remarkably enhanced due to the co-effects of Ag and N-doping. It provides a superior sensing performance for electrochemical detection of hydrogen peroxide at − 0.3 V with a high sensitivity of 33.25 μA mmol L−1 cm−2, wide linear range of 0.05–2100 μM and low detection limit of 7.7 nM. The fabricated sensor also reliably applied in detection of H2O2 in milk samples with good reproducibility, repeatability and storage stability.
Highlights
We report the fabrication of silver nanoparticles evenly imbedded into titanium nitride (TiN) submicrospheres via one-pot solvothermal reaction and subsequent nitridation for electrochemical detecting of hydrogen peroxide
A great deal of efforts have been devoted to the development of non-enzymatic electrochemical sensors based on silver n anoparticles[14], which have been proven to be an inexpensive, nontoxic and highly effective catalyst for amperometric H2O2 detection[15]
Biocompatible TiN nanorod arrays fabricated by solvent-thermal synthesis and subsequent nitridation in ammonia atmosphere deliver the superior electrocatalytic activity and highly selective sensing H2O2 owing to their good electronic conductivity and large surface a rea[32]
Summary
We report the fabrication of silver nanoparticles evenly imbedded into TiN submicrospheres via one-pot solvothermal reaction and subsequent nitridation for electrochemical detecting of hydrogen peroxide. The electrocatalytic ability of TiN might promote the synergistic effects of silver highly dispersed nanocomposites for H2O2 sensors. Electrochemical property measurements were demonstrated on Ivium potentiostat in 0.02 M PBS (pH 7.0) with different concentrations of H2O2.The detection of H 2O2 by cyclic voltammetry using a three-electrode cell such as the Ag-TiN/SMS as working electrodes, Pt foil as counter electrode and Ag/AgCl as reference electrode.
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