Integrated all-solid-state pH electrochemical sensor based on nanometer tungsten oxide and method for making same

Abstract

The invention discloses an integration all-solid-state PH electrochemical sensor and preparing method based on nanometer tungsten oxide. The sensor comprises a basal plate, a sensor and a detection device, wherein the basal plate is provided with a WO3 working electrode and an Ag / AgCl solid state reference electrode, and the two electrodes are externally connected with the detection device through connecting wires. The invention integrates the nanometer tungsten oxide H<+> response working electrode and the Ag / AgCl solid state reference electrode on the basal plate. The metal oxide H<+> response working electrode is characterized in that: the working electrode has easy preparation, quick response and high mechanical strength, thereby being applicable to a special detection environment which a glass PH electrode is not suitable for. In addition, the all-solid-state Ag / AgCl reference electrode which replaces the prior Ag / AgCl reference electrode needing filling reference solution facilitates miniaturization or portability.

Description

technical field [0001] The invention relates to the field of preparation of electrochemical sensors, in particular to an integrated all-solid-state pH electrochemical sensor based on nanometer tungsten oxide and a preparation method thereof. Background technique [0002] pH value is one of the most important physical and chemical parameters of aqueous solution. Many natural phenomena, chemical changes and production processes involving aqueous solution are related to pH. Therefore, it is required in many fields such as industrial production, agriculture, medicine, environmental monitoring, and scientific research. Measure pH. At present, the most commonly used pH electrode for pH electrochemical sensors is the glass electrode. Due to the defects of the glass pH electrode, such as acid error under acidic conditions, sodium error under alkaline conditions, low mechanical strength, it is easy to break and difficult to miniaturize, Can not be used in high temperature and high p...

AI Technical Summary

Problems solved by technology

At present, pH electrodes are mainly prepared from precious metal oxides such as iridium oxide and rhodium oxide. The methods for preparing tungsten oxide electrodes include electrochemical cyclic voltammetry, chemical oxidation, and ion sputtering deposition. These preparation methods are relatively complicated and difficult to control. chemical composition, or the use of toxic and carcinogenic chromates

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