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Preparation method for gas-sensitive element for hydrocarbon gas detection

A hydrocarbon gas and gas-sensing technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of high processing cost, complex synthesis process, high operating temperature, etc., and achieve low processing cost and simple synthesis method , the effect of high sensitivity

Active Publication Date: 2014-11-05
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of complex synthesis process, high operating temperature and high processing cost in the prior art. It provides a new method for preparing a gas sensor for hydrocarbon gas detection.

Method used

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  • Preparation method for gas-sensitive element for hydrocarbon gas detection

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Effect test

Embodiment 1

[0021] The invention provides a method for preparing a tin oxide thin film gas sensor for hydrocarbon gas detection, comprising the following steps:

[0022] (1) Pretreatment of the substrate: treat the ceramic substrate with concentrated hydrochloric acid for 5 minutes, then treat it with concentrated ammonia water for 15 minutes, and dry it in an oven at 100°C;

[0023] (2) Preparation of tin dioxide: at 50°C, add 10 grams of SnCl to 50 mL of absolute ethanol 2 2H 2 O, make it dissolve into a transparent solution under full stirring, the concentration is 0.25kg / L;

[0024] (3) Preparation of tin dioxide thin film: under the condition of constant temperature water bath at 72°C, put the treated substrate into the solution to coat the film, and ensure that the thickness of the film on the substrate is uniform during the coating process, and let it dry naturally in the air , repeated 5 times, and placed in an oven at 107°C for 1 hour. The weight ratio of pretreatment matrix a...

Embodiment 2

[0035] The invention provides a method for preparing a tin oxide thin film gas sensor for hydrocarbon gas detection, comprising the following steps:

[0036] (1) Pretreatment of the substrate: treat the ceramic substrate with concentrated hydrochloric acid for 3 minutes, then treat it with concentrated ammonia water for 10 minutes, and dry it in an oven at 80°C;

[0037] (2) Preparation of tin dioxide: at 45°C, add 20 grams of SnCl to 50 mL of absolute ethanol 2 2H 2 O, make it dissolve into a transparent solution under full stirring, the concentration is 0.5kg / L;

[0038] (3) Preparation of tin dioxide film: under the condition of 65°C constant temperature water bath, put the treated substrate into the solution to coat the film, and ensure that the thickness of the film on the substrate is uniform during the coating process, and let it dry naturally in the air , repeated 2 times, and placed in an oven at 90°C for 2 hours. The weight ratio of pretreatment matrix and tin dio...

Embodiment 3

[0041] The invention provides a method for preparing a tin oxide thin film gas sensor for hydrocarbon gas detection, comprising the following steps:

[0042] (1) Pretreatment of the substrate: treat the ceramic substrate with concentrated hydrochloric acid for 8 minutes, then treat it with concentrated ammonia water for 20 minutes, and dry it in an oven at 120°C;

[0043] (2) Preparation of tin dioxide: at 43°C, add 10 grams of SnCl to 100 mL of absolute ethanol 2 2H 2 O, make it dissolve into a transparent solution under full stirring, the concentration is 0.13kg / L;

[0044] (3) Preparation of tin dioxide film: under the condition of constant temperature water bath at 75°C, put the treated substrate into the solution to coat the film, and ensure that the thickness of the film on the substrate is uniform during the coating process, and let it dry naturally in the air , repeated 5 times, and placed in an oven at 120° C. to continue drying for 0.5 hours. The weight ratio of pre...

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Abstract

The invention relates to a preparation method for a gas-sensitive element for hydrocarbon gas detection, and is mainly used for solving the problems of complicated synthesis technology, relatively high operating temperature and relatively high processing cost in the prior art. The preparation method for the gas-sensitive element for the hydrocarbon gas detection comprises the following steps of (1) pretreating a base body: treating the base body through acid and alkali in sequence, and drying the base body to obtain a pretreated base body; (2) preparing tin dioxide: adding SnCl2.2H2O into ethyl alcohol to obtain tin dioxide solution; (3) preparing a tin dioxide thin film: putting the obtained pretreated base body into the tin dioxide solution for film coating, and then performing drying and baking to obtain a base body coated by a tin oxide precursor; (4) performing thermal treatment: heating, roasting and cooling the base body coated by the tin oxide precursor to obtain the tin oxide thin film gas-sensitive element. According to the technical scheme, the problems in the prior art are well solved; the gas-sensitive element can be used for the hydrocarbon gas detection.

Description

technical field [0001] The invention relates to a preparation method of a gas sensitive element used for hydrocarbon gas detection. Background technique [0002] Once the flammable gas leaks in the process of oil and gas exploration and development, refining and chemical production, transportation, use, etc., it will cause poisoning, fire and even explosion accidents, seriously endangering people's lives and property safety. Since the specific chemical sensing system has strong sensitivity to certain flammable gases, it can quickly detect the concentration change of the gas, and timely remedy the leakage accident is a necessary condition to avoid causing heavy property and personal casualties. [0003] Tin oxide-based gas sensors are widely used in the detection of flammable gases such as hydrocarbons. This type of chemical sensor has high sensitivity and fast response speed, and can be quickly detected when the gas concentration is very low without having to go deep into th...

Claims

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Application Information

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IPC IPC(8): G01N27/407
Inventor 凌晓东党文义于安峰王全国史少帅
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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