Protonic acid doped polyaniline material and room temperature ammonia gas sensor as well as preparation method

Abstract

The invention provides a preparation method for protonic acid doped polyaniline, which comprises the following steps: at the room temperature, phenylamine and protonic acid are mixed to form a premixed solution, a template is added into the premixed solution, ultrasonic mixing and ice-water bath treatment are conducted sequentially, an ultrasonic dispersion solution is obtained, an oxidizing agentis dropwise added into the ultrasonic dispersion solution, standing reaction lasts for 20h-30h, and a protonic acid doped polyaniline material is prepared; the protonic acid may be oxalic acid, hydrochloric acid, sulfuric acid, citric acid, camphorsulfonic acid or benzoic acid; the molar ratio of the phenylamine, the protonic acid, the template and the oxidizing agent is 1:(2-3):(2-3):(5-10). Theinvention further provides a protonic acid doped polyaniline material and a room temperature ammonia gas sensor, and the room temperature ammonia gas sensor has relatively good sensibility and selectivity for ammonia gas, relatively low power consumption and relatively simple processing technology under the condition of room temperature.

Description

technical field [0001] The invention belongs to the field of ammonia sensors, and in particular relates to a protonic acid-doped polyaniline material, a room temperature ammonia sensor and a preparation method thereof. Background technique [0002] Ammonia is a colorless gas with a strong pungent odor. It has a wide range of uses in industry and medicine. However, ammonia is corrosive, and it has a corrosive and irritating effect on the tissues it contacts, denatures tissue proteins, saponifies tissue fats, and destroys cell membranes with extremely high solubility. Therefore, it mainly stimulates and corrodes the upper respiratory tract of the human body and weakens the body's resistance to diseases. In addition, ammonia can also cause cardiac arrest and respiratory arrest through the reflex action of the trigeminal nerve endings. The detection of ammonia is mainly used in chemical plants, cold storage, smart public toilets and aquaculture, etc. Current tests for toxic ...

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Problems solved by technology

[0003] However, traditional inorganic semiconductor sensors generally require a working temperature of 300°C to 400°C, which consumes a lot of power, and because the working substrate under high temperature conditions generally uses a ceramic substrate, the process of processing and assembling the sensor is complicated and difficult. , resulting in higher cost

However, the high cost of electrochemical sensors brings certain difficulties to the wide application of ammonia testing.

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