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High-precision gas detector

A gas detector and composite nanofiber technology, applied in the field of detectors, can solve the problems of low sensitivity, poor mechanical stability, restricting the use of SnO2-based gas sensors, etc., and achieve the effect of process optimization and improved accuracy

Inactive Publication Date: 2018-09-28
广东为邦消防技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual application of SnO2 nanofibers, there are problems such as poor mechanical stability, low sensitivity and poor gas selectivity, which restrict the use of SnO2-based gas sensors to a certain extent.

Method used

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  • High-precision gas detector

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Effect test

Embodiment 1

[0040] In the present embodiment, the preparation steps of the SnO2 composite nanofibers:

[0041] Step 1. Preparation of carbon rubber balls

[0042]Add 16g of glucose to 120ml of deionized water to dissolve, stir evenly, then heat the solution at a constant temperature of 160°C for 10h, after the reaction is completed, cool it down to room temperature naturally, then use alcohol and deionized water to separate and wash by centrifugation, and repeat the washing three times. Obtain dark brown product carbon rubber balls, which are dried at 70°C for 10 hours for later use;

[0043] Step 2, preparation of WO3 doped SnO2 porous hollow spheres

[0044] Add 0.8-1.0g of tungstic acid and tin chloride to the mixture of 75ml of ethanol and 8ml of water and stir evenly, then add 0.2g of urea and stir evenly; then add the carbon rubber balls prepared in step 1 into the solution, ultrasonically disperse and statically place, centrifuge, wash, dry at 80°C for 12h, and finally dry the dr...

Embodiment 2

[0055] In the present embodiment, the preparation steps of the SnO2 composite nanofibers:

[0056] Step 1. Preparation of carbon rubber balls

[0057] Add 20g of glucose to 120ml of deionized water to dissolve, stir evenly, then heat the solution at a constant temperature of 160°C for 10h, after the reaction is over, let it cool down to room temperature naturally, then centrifuge and wash with alcohol and deionized water in turn, and repeat the washing three times, Obtain dark brown product carbon rubber balls, which are dried at 70°C for 10 hours for later use;

[0058] Step 2, preparation of WO3 doped SnO2 porous hollow spheres

[0059] Add 1.0g of tungstic acid and tin chloride to the mixture of 75ml of ethanol and 8ml of water and stir evenly, then add 0.2g of urea and stir evenly; then add the carbon glue balls prepared in step 1 into the solution, ultrasonically disperse and let stand, Centrifuge, wash, and dry at 80°C for 12 hours, and finally dry the dried product at...

Embodiment 3

[0070] In the present embodiment, the preparation steps of the SnO2 composite nanofibers:

[0071] Step 1. Preparation of carbon rubber balls

[0072] Add 19g of glucose to 120ml of deionized water to dissolve, stir evenly, then heat the solution at a constant temperature of 160°C for 10h, after the reaction is completed, cool it down to room temperature naturally, then use alcohol and deionized water to separate and wash by centrifugation, and repeat the washing three times. Obtain dark brown product carbon rubber balls, which are dried at 70°C for 10 hours for later use;

[0073] Step 2, preparation of WO3 doped SnO2 porous hollow spheres

[0074] Add 0.9g of tungstic acid and tin chloride to the mixture of 75ml of ethanol and 8ml of water and stir evenly, then add 0.2g of urea, and stir evenly; then add the carbon glue balls prepared in step 1 into the solution, ultrasonically disperse and let stand, Centrifuge, wash, and dry at 80°C for 12 hours, and finally dry the drie...

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Abstract

The invention relates to an ethanol gas detector based on SnO2 composite nano fiber. The gas detector is in a side-heating structure, and comprises an alumina ceramic tube having three parallelly anduniformly-distributed circular gold electrodes provided at an external surface, an ethanol sensitive material coated at the surface of the ceramic tube, and a nickel-chromium alloy heating coil passing through the ceramic tube, two platinum filament pins are connected with each gold electrode, the sensitive material is the SnO2 composite nano fiber prepared by a static spinning method, and the SnO2 composite nano fiber comprises SnO2 porous hollow spheres, ZnO nano wire, and cellulose acetate nano fiber. Preferably, the sensitive material comprises SnO2 porous hollow sphere-doped WO3 and CuO.By doping, the doped SnO2 porous hollow sphere is prepared, the doped SnO2 porous hollow sphere, ZnO nano wire, and cellulose acetate nano fiber have synergistic effect, and the detector precision isgreatly increased.

Description

technical field [0001] The invention relates to the technical field of detectors, in particular to an ethanol gas detector based on a composite nanofiber high-precision sensor. Background technique [0002] Ethanol (Ethanol), commonly known as alcohol, is an organic substance with a simplified structure CH 3 CH 2 OH or C 2 h 5 OH, molecular formula C 2 h 6 O, is the most common monohydric alcohol. [0003] Ethanol is a flammable, volatile, colorless and transparent liquid at normal temperature and pressure. It has low toxicity and cannot be drunk directly in pure liquid. It has a special fragrance and is slightly irritating. It is flammable, its vapor can form explosive mixture with air, and it can be miscible with water in any ratio. It can be miscible with chloroform, ether, methanol, acetone and most other organic solvents, and its relative density (d15.56) is 0.816. [0004] Gas detector is an instrumentation tool for gas leakage concentration detection, includin...

Claims

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Application Information

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IPC IPC(8): G01N27/00G01N27/12
CPCG01N27/00G01N27/127
Inventor 范立张立海张志凌
Owner 广东为邦消防技术服务有限公司
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