Hydrogen peroxide non-enzyme electrochemical sensor and preparation method thereof

Abstract

The invention discloses a hydrogen peroxide non-enzyme electrochemical sensor for detecting H2O2 by utilizing the response of a chemical electrode under H2O2. A chemical electrode is a pair of electrodes embellished by noble metal nanometer particles, and the noble metals are gold, silver, platinum, palladium or iridium; the electrodes embellished by noble metal nanometer particles are the noble metal nanometer particles which are deposited on an electrode material through a beam depositing method, the deposit rate of the nanometer particles in the deposition of the nanometer particles is controlled to be more than 0.3 layer and less than 5 layers, and a glassy carbon electrode material or nano-graphite is adopted as an electrode material. The hydrogen peroxide non-enzyme electrochemical sensor provided by the invention has the advantages that the electrode embellished by the method enables the surface of the electrode to have the good dispersibility and crystallinity as well as the clean surface, a problem that a catalyst of the traditional method is easy to gather and fall is solved, using of a conductive binding agent is avoided, the effective catalyzing area and stability of the electrode are improved, and the delivery of an electron between the electrode and the catalyst is accelerated.

Description

technical field [0001] The present invention relates to the chemical sensor field, especially a kind of for H 2 o 2 Sensing Ag-modified glassy carbon electrode fabrication process for improved sensing components. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) is an important chemical substance in the biological system, it seriously affects the cell function and metabolism, high concentration of H 2 o 2 even cause cell death. H is often accompanied by many enzymatic reactions, protein accumulation and antigen-antibody recognition 2 o 2 It is also an important substance in clinical application, pharmaceutical engineering, food industry and environmental monitoring [1-3]. Therefore, the development of accurate, sensitive, fast and low-cost H 2 o 2 The detection method has very important application value. Enzyme sensors usually face problems such as poor reliability, high cost, and cumbersome enzyme immobilization procedures. Enzyme activity is also easil...

AI Technical Summary

Problems solved by technology

The current commonly used electrode construction method mainly has three shortcomings: (1) The surface of the catalyst prepared by chemical method will adsorb more organic molecules or impurity ions, which is difficult to remove, which will affect the catalytic activity and sensitivity of the modified electrode

(2) If the catalyst is drip-coated or spin-coated on the surface of the electrode, it is easy to aggregate and reduce the effective catalytic area of ​​the electrode and affect its catalytic activity; (3) The use of polymer binders will hinder the contact between the catalyst and the electrode to a certain extent. The electron transfer between them, and the binder may have side reactions under the measured potential, which will affect the experimental results

However, the catalysts prepared by the methods reported in these documents are easy to aggregate and fall off, so a conductive binder must be used

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