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V2O5 nanoflower structure-based xylene gas sensor and preparation method thereof

A gas sensor and nanoflower technology, applied in the field of sensors, can solve problems such as poor selectivity, low responsiveness, health threats, etc., and achieve the effect of good selectivity, high responsiveness, and improved gas sensitivity characteristics

Pending Publication Date: 2022-04-08
太原腾星传感技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although xylene has high application value, as a toxic gas, it also poses a huge threat to human health
However, currently known side-heated V 2 o 5 Gas sensors obviously suffer from the following disadvantages: low responsivity, poor selectivity, high minimum detection limit, and lack of detailed explanation of the gas sensing mechanism, etc.

Method used

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  • V2O5 nanoflower structure-based xylene gas sensor and preparation method thereof
  • V2O5 nanoflower structure-based xylene gas sensor and preparation method thereof
  • V2O5 nanoflower structure-based xylene gas sensor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a V 2 o 5 The preparation method of nano flower structure, comprises the following steps:

[0037] (1) Add vanadium pentoxide and oxalic acid dihydrate into a beaker containing 20 mL of deionized water at a molar ratio of 1:3, and continuously magnetically stir at 80°C for 2 hours to obtain a blue transparent VOC 2 o 4 solution;

[0038] (2) at room temperature and under the condition of continuous magnetic stirring, to the VOC in step (1) 2 o 4 Slowly add 4.68 mL of 30% H in the solution 2 o 2 solution, and continued to stir for 20min to obtain mixed solution A;

[0039] (3) Add 60 mL of ethanol solution to the mixed solution A, stir for 30 minutes to obtain the mixed solution B, divide the mixed solution B into four groups and quickly transfer them to the hydrothermal synthesis reaction kettle, and keep the four groups of mixed solutions B separately at 170°C 0.5h, 1h, 2h, 3h, 4h, and naturally cooled to room temperature, four groups of black products were obt...

Embodiment 2

[0043] A V-based 2 o 5 The xylene gas sensor with nanoflower structure consists of a ceramic tube substrate with two ring-shaped platinum electrodes arranged in parallel and separated from each other on the outer surface, sensitive materials coated on the outer surface of the ceramic tube and gold electrodes, and placed on the ceramic tube. The nickel-chromium heating coil in the tube is composed of the sensitive material V 2 o 5 Nano flower structure powder.

Embodiment 3

[0045] A V-based 2 o 5 The preparation method of the xylene gas sensor of nano flower structure comprises the following steps:

[0046] V 2 o 5 -0.5, V 2 o 5 -1, V 2 o 5 -2, V 2 o 5 -3 and V 2 o 5 -4 for the preparation of five groups of raw materials based on V 2 o 5 The xylene gas sensor with nanoflower structure is prepared as follows:

[0047] (1) Take 100g V 2 o 5 The nanoflower structure powder is mixed with 40mL ethanol solution and ground in a grinding bowl until a paste is formed;

[0048] (2) Dip a small amount of slurry with a fine brush and apply it evenly on the ceramic tube with two ring-shaped platinum electrodes arranged in parallel and separated from each other on the outer surface to form a 10-30 μm thick sensitive material film, and make the sensitive material Completely cover the ring-shaped platinum electrode, dry in the shade or bake under infrared lamps, baking under infrared lamps can speed up the drying of sensitive materials;

[0049]...

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Abstract

The invention discloses a xylene gas sensor based on a V2O5 nanoflower structure and a preparation method of the xylene gas sensor based on the V2O5 nanoflower structure. The outer surface of the ceramic tube substrate is provided with two annular platinum electrodes which are arranged in parallel and are separated from each other, the outer surface of a ceramic tube and gold electrodes are coated with the sensitive material, the nickel-chromium heating coil is arranged in the ceramic tube, and the sensitive material is V2O5 nanoflower structure powder. According to the invention, the V2O5 material is modified by adopting a mode of a V2O5 nanoflower structure, so that the gas-sensitive characteristic of the gas sensor is remarkably improved.

Description

technical field [0001] The present invention relates to the technical field of sensors, in particular to a V-based 2 o 5 A xylene gas sensor with a nanoflower structure and a preparation method thereof. Background technique [0002] Xylene is a colorless, aromatic-smelling volatile organic compound (VOC) that is commonly used in interior coatings, medical technology, industrial production and agriculture. Although xylene has high application value, as a toxic gas, it also poses a huge threat to human health. Studies have shown that long-term exposure to xylene atmosphere can cause headaches, fatigue, tremors, breathing, cardiovascular and kidney problems, and even leukemia. Therefore, it is of great significance to develop xylene gas sensors with excellent xylene sensing characteristics. [0003] Among the many kinds of gas sensors, the resistive gas sensor with semiconductor oxide as sensitive material has the advantages of high sensitivity, low detection limit, good se...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 古瑞琴王晓平马守逵王鸿杰王慧
Owner 太原腾星传感技术有限公司
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