Sensitive electrode, formaldehyde flexible sensor and preparation method of sensitive electrode

A flexible sensor and sensitive electrode technology, applied in instruments, scientific instruments, electrochemical variables of materials, etc., can solve the problems of signal stability and selectivity affected by environmental factors, complex structure of infrared sensors, and reduced porosity, etc. The effect of anti-CO poisoning ability, improving catalytic oxidation performance, and improving electronic conductivity

Pending Publication Date: 2021-10-22
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although electrochemical, semiconductor and catalytic combustion sensors are simple in structure and easy to operate, their signal stability and selectivity are affected by environmental factors
The structure of the infrared sensor is complex and the power consumption is large
The catalytic luminescence sensor has high sensitivity, fast response speed, strong stability, does not consume catalyst during the reaction process, and can monitor various gases such as formaldehyde in the environment for a long time, but the catalyst needs to be loaded on a porous material, and the porosity after loading is significantly reduced

Method used

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  • Sensitive electrode, formaldehyde flexible sensor and preparation method of sensitive electrode
  • Sensitive electrode, formaldehyde flexible sensor and preparation method of sensitive electrode
  • Sensitive electrode, formaldehyde flexible sensor and preparation method of sensitive electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Pretreatment of titanium foil: ultrasonic degreasing in acetone for 15 minutes, methanol or ethanol cleaning, 1mol / L HF treatment for 10 minutes, double distilled water ultrasonic cleaning for 3 times, and drying;

[0028] (2) Formation of porous titanium foil: soak the cleaned titanium foil in H 2 o 2 Heat to 90°C, continue heating for 40-60min, wait for H 2 o 2 Take out the titanium foil after it turns dark blue, wash it several times with distilled water and absolute ethanol, then dry it, and then place it in a muffle furnace for calcination at 300°C for 30 minutes. After taking it out, a titanium foil with a three-dimensional porous structure is obtained.

[0029] (3) TiO on the inner and outer surfaces of pores 2 Formation of nanotubes: the treated porous titanium foil is anodized in the electrolyte; the composition of the electrolyte: 0.5%-1% HF, 1mol / L H 2 SO 4 , electrolysis potential 20V, electrolysis time 30-120 minutes; after electrolysis, wash with ...

Embodiment 2

[0036] Step (4) electroplating time is 60 minutes, in step (5) 348mg aniline, 202.5mg o-phenylenediamine, 1.5525g 2-acrylamide-2 methylpropanesulfonic acid and 126mg p-acetanilide, 2mol / L HCl dissolved 427.5mg ammonium persulfate, all the other are with embodiment 1.

Embodiment 3

[0038] Step (4) electroplating time is 90 minutes, in step (5) 116.3mg aniline, 67.5mg o-phenylenediamine, 517.5mg2-acrylamide-2 methylpropanesulfonic acid and 42mg p-acetanilide, 2mol / L HCl dissolved 142.5mg ammonium persulfate, all the other are with embodiment 1.

[0039] figure 2 It is the current when the formaldehyde flexible sensor of the sensitive electrode prepared in Example 1, Example 2 and Example 3 is working when the sampling formaldehyde concentration is 0, 20ppm, 40ppm, 60ppm, 80ppm, 100ppm, 200ppm, 300ppm, 500ppm and 800ppm respectively . figure 2 It can be seen that the sensitivity of the three sensors is basically the same, and the zero points are not much different. The formaldehyde concentration can be determined by measuring the current at which the sensor operates while sampling the actual gas.

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Abstract

The invention belongs to the technical field of gas sensors, and particularly relates to a sensitive electrode, a formaldehyde flexible sensor and a preparation method thereof. The preparation method of the sensitive electrode comprises the following steps: depositing a CoAg alloy on a TiO2 nanotube / porous titanium foil, then coating polyaniline-poly(2-acrylamide-2-methylpropanesulfonic acid), and then spin-coating PDMS on a single surface. The formaldehyde flexible sensor comprises a sensor shell, an air chamber, a cathode diffusion layer, a cathode catalyst layer, a Nafion film, a sensitive electrode and a gas reaction chamber are sequentially arranged in the sensor shell, and the side, spin-coated with PDMS, of the sensitive electrode is close to the gas reaction chamber. The formaldehyde flexible sensor comprising the sensitive electrode is safe, reliable, environment-friendly and stable in performance when being applied to formaldehyde detection, and has relatively high poisoning resistance and interference resistance.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a sensitive electrode, a formaldehyde flexible sensor and a preparation method thereof. Background technique [0002] With the improvement of people's living standards and the improvement of human health awareness, the problem of indoor air quality has increasingly become the focus of public attention. Among the many indoor harmful gases, formaldehyde is becoming the number one killer that endangers human health. Formaldehyde is an important industrial raw material, which is widely used in textiles, coatings, adhesives, wood processing and other industries, and has become the main source of formaldehyde in the air. In addition, the extensive use of various textiles and decorative materials has also become the main source of formaldehyde. It is difficult to completely remove formaldehyde in a short period of time. It will be released slowly over a long period of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12G01N27/30
CPCG01N27/126G01N27/127G01N27/30
Inventor 鞠剑峰章琴张毅婷叶延鹏李佳钰黄启浩齐星原胡源鑫
Owner NANTONG UNIVERSITY
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