Investigation Of Hydrogen Peroxide Electrochemical Sensing Based On Three Kinds Of Silver Nanoconpasites

Silver nanocomposites were widely applied in the field of electrochemical sensing due to their unique physical,chemical and catalytic properties.In this thesis,three kinds of silver nanocomposites with different morphologies were prepared by Surfactant method and hydrothermal method,then,three different electrochemical sensor were fabricated based on these nanocomposites.The methods for the detection of hydrogen peroxide(H2O2)were proposed.The investigation extends the application range of silver nanocomposites and enriched the study of electrochemical sensing,also provided reference for the construction of electrochemical sensing interface of H2O2.The thesis included two chapters and the following showed the main content:1.sea urchin-like Ag/FeOOH nanocomposites were synthesized via hydrothermal method and chemiacl reduction method and then a new H2O2 sensor without enzyme was developed by immobilizing the sea urchin-like Ag/FeOOH nanocomposites on a gold(Au)electrode.The results showed that silver nanoparticles(Ag NPs)were dispersed on the surface of sea urchin FeOOH uniformly;The electrochemical investigations indicated that the sea urchin-like Ag/FeOOH nanocomposites possessed remarkable performance for the eletroreduction of H2O2 and showed a linear response for the detection of H2O2 in the range of 30.0 ?mol/L to 15.0 mmol/L with a low detection limit of 11.4 ?mol/L(S/N=3).2.Flower-like Ag/FeS/PVP nanocomposites were synthesized by a surfactant-assisted hydrothermal method,then a new H2O2 sensor was fabricated by immobilizing the flower-like Ag/FeS/PVP nanocomposites on a GCE.TEM showed that Ag NPs were distributed on the surface of FeS/PVP;The electrochemical investigations indicated that tthe flower-like Ag/FeS/PVP nanocomposites possessed a good performance for the eletroreduction of H2O2 and showed a linear response for the detection of H2O2 in the range of 0.0775 mmol/L-72.8 mmol/L,detection limit was 1.92 Lpmol L-1(S/N= 3)and sensitivity was 39.1 ?A(mmol L-1)-1 cm-2;3.Ag/boehmite nanotubes/rGO)were synthesized by hydrothermal method and for enhanced electrochemical sensing of H2O2.TEM revealed that Ag NPs were fixed on the surface of boehmite nanotubes/rGO uniformly;The sensor based on Ag/boehmite nanotubes/rGO nanocomposites possessed remarkable performance for the electricalreduction of H2O2,and showed a linear response for the detection of H2O2 in the range of 0.5 pmol/L-10.0 mmol/L with sensitivity of 80.1 ?A mmol/L-1 cm-2 and detection limit of 0.17 pmol/L(S/N=3).