Fabrication of Nanocomposite Modified Materials Based on Bi-Metalic Transition Metal Sulfide Using Copper (I) Oxide Nanospheres as a Catalytic Substrate for Designation of Amperometric Non-Enzymatic Hydrazine and Hydrogen peroxide Sensors

Darvishmehr, Zahra | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56006 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Shahrokhian, Saeed
  7. Abstract:
  8. In this study, transition metal sulfide, with a high accessible surface and abundant electroactive centers, was used as an electrocatalyst to fabrication an electrochemical sensor of hydrazine and hydrogen peroxide. the direct growth of thin film of nanocomposite can be considered as an efficient method to modify the electrode surface, and the application of these modified electrodes as electrochemical sensors. the cobalt iron sulfide (CoFeS) nanosheets were directly grown on Cu2O nanospheres in order to design hierarchical nanocomposite by using efficient, inexpensive and fast method. Here, Cu2O nanospheres not only served as substrate, but also steer the CoFeS to attach on nanospheres surface preferentially. the growth of CoFeS nanosheets on the conductive Cu2O nanospheres makes the efficient use of electroactive materials possible due to the synergistic effect between the structures. this direct growth of CoFeS@Cu2O hierarchical nanocomposite on the GCE surface without requirement of any binder or additive layer, make efficient use of electrocatalyst materials. moreover, the potential utility of this sensing platform for the analytical determination of hydrazine and hydrogen peroxide was evaluated by the amperometry technique. as the hydrazine sensor, the fabricated electrode demonstrated two wide linear range (0.0001-0.021 mM and 0.021-1.771 mM), high sensitivity (103.33 and 21.23 mA/mM.cm2), low detection limit (0.12 µM) and excellent selectivity. The as-proposed nanocomposite also exhibited high sensitivity (12.31 and 3.96 mA/mM.cm2 ) toward the hydrogen peroxide reduction with two linear range (0.001-0.03 and 0.03-2.03), low detection limit and negligible interference ability. due to the unique properties of the prepared CoFeS@Cu2O thin film electrode such as uniform, excellent stability, high electroactive surface area, and good availability to analyte and electrolyte diffusion, it was directly used as the electrode material for non-enzymatic electrocatalytic oxidation of hydrazine and reduction of hydrogen peroxide. finally, in order to examine the ability of the modified electrode in practical applications, the seawater was analyzed and results show that the fabricated electrode can be used as a reliable and applicable sensing platform for the determination of hydrazine and hydrogen peroxide in real samples
  9. Keywords:
  10. Modified Electrodes ; Glassy Carbon Electrode ; Nanocomposite ; Peroxides ; Hydrogen Sensor ; Cyclic Voltammetry ; Transition Metal Sulfide ; Nonenzymatic Sensor ; Hydrazine ; Hydrogen Peroxide ; Chronoamperometry

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