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Preparation method of high-sensitivity NO2 gas sensor

A gas sensor, high-sensitivity technology, applied in instruments, scientific instruments, nanotechnology for materials and surface science, etc., to achieve good repeatability, improve detection sensitivity, and good stability

Inactive Publication Date: 2017-04-26
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for the deficiencies in the existing single gas sensitive material sensor, through the compounding of two kinds of system materials to achieve the detection of NO 2 Gases have highly sensitive detection, as well as excellent selectivity and stability based on WO 3 / High sensitivity NO of graphene nanocomposite 2 Preparation method of gas sensor

Method used

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  • Preparation method of high-sensitivity NO2 gas sensor
  • Preparation method of high-sensitivity NO2 gas sensor
  • Preparation method of high-sensitivity NO2 gas sensor

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Embodiment 1

[0041] The invention discloses a WO-based 3 / High sensitivity NO of graphene nanocomposite 2 A preparation method for a gas sensor, the preparation method comprising:

[0042] (1) Preparation of graphene oxide

[0043] Prepared using the improved Hummers method, weighed 1.5g graphite powder, 9g KMnO4, 180ml concentrated H 2 SO 4 , 20mlH 3 PO 4 (VH 2 SO 4 :VH 3 PO 4 =9:1) into a 500ml round-bottomed flask, heated to 50°C and stirred for 12 hours to generate a brown solution, cooled to room temperature, poured dropwise 3ml of 30% H 2 o 2 In 200ml of ice water, it turns into a brown-yellow suspension, centrifuge, pour off the supernatant, add concentrated HCl, shake evenly, centrifuge, and then wash with ethanol and deionized water several times, when the supernatant is close to neutral After cleaning, put it in an oven at 80°C overnight.

[0044] (2) Preparation of H 2 WO 4 / Oxalic acid transparent sol

[0045] 8.15g Na 2 WO 4 Stir and dissolve in 20ml of deion...

Embodiment 2

[0051] In the step (3) of embodiment 1, add 10mg graphene oxide, other steps and conditions are the same as in embodiment 1, specific conditions are changed and adjusted accordingly within the scope limited by the summary of the invention, can obtain WO 3 / Graphene nanocomposite material; drop-coat the suspension of graphene nanocomposite material on the welded flat electrode to make a side-heated gas sensor, dry it at room temperature for 8 hours, and heat-treat the prepared sensor electrode at 120°C for 24 hours; For prepared WO 3 / Graphene nanocomposites to 20ppm NO at different operating temperatures 2 Gas sensitivity, the test curve is shown in figure 1 L2.

Embodiment 3

[0053] In the step (3) of embodiment 1, add 15mg graphene oxide, other steps and conditions are the same as in embodiment 1, specific conditions are changed and adjusted accordingly within the scope limited by the summary of the invention, can obtain WO 3 / Graphene nanocomposite material; drop-coat the suspension of graphene nanocomposite material on the welded flat electrode to make a side-heated gas sensor, dry it at room temperature for 8 hours, and heat-treat the prepared sensor electrode at 120°C for 24 hours; For prepared WO 3 / The sensitivity of graphene nanocomposites to 20ppm NO2 gas at different working temperatures, the test curve is shown in figure 1 L3.

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Abstract

The invention discloses a preparation method of a high-sensitivity NO2 gas sensor. The preparation method comprises the following steps: (1) preparing WO3 / graphene nanocomposites; taking graphene oxide, sulfate salt and tungstate as raw materials and preparing through a hydrothermal method to obtain the WO3 / graphene nanocomposites; (2) preparing a NO2 gas sensor; weighing the WO3 / graphene nanocomposites and adding the WO3 / graphene nanocomposites into a beaker, carrying out ultrasound treatment for 10 minutes to be dissolved completely, absorbing suspension liquid by using a pipette to a plane electrode, and then preparing into a nano-composite based indirectly heated gas sensor. The gas sensor prepared by the method can show good selectivity and high sensitivity for NO2 at lower working temperature, and further has fast response and recovery characteristics, and potential application in the gas sensor with high performances and low power consumption.

Description

technical field [0001] The invention relates to the field of functional nanomaterial manufacturing, in particular to a WO-based 3 / High sensitivity NO of graphene nanocomposite 2 Preparation method of gas sensor. Background technique [0002] NO 2 The gas is a brownish-red pungent poisonous gas, and the combustion of fossil fuels will produce a large amount of NO 2 gas; inhaled NO 2 The gas mainly damages the respiratory tract, and at the same time is harmful to the environment, which promotes the formation of acid rain and causes water, soil and air pollution; the current detection of NO 2 Gas methods include spectrophotometry, fluorescence photometry, and the like. However, the detection operation is complicated, the test time is long, the maintenance cost of the instrument is high, and on-site monitoring cannot be carried out; therefore, NO 2 The rapid and accurate testing of gases is of great significance; chemically synthesized nanomaterials are important for NO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12G01N27/00B82Y30/00
CPCG01N27/127B82Y30/00G01N27/00
Inventor 朱志刚龙建军胡校兵
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY