Preparation method of gas sensor for hydrocarbon gas detection

A gas sensor, hydrocarbon gas technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of high processing cost, high operating temperature, complex synthesis process, etc., and achieve low processing cost and sensitivity. High, easy to synthesize effect

Active Publication Date: 2016-11-16
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, and a new preparation method of a gas sensor for hydrocarbon gas detection is provided

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  • Preparation method of gas sensor for hydrocarbon gas detection

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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 with sufficient 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 the pretreated s...

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 with sufficient 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 the pretreated substrate t...

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, under full stirring to dissolve into a transparent solution with a concentration of 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 the pr...

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Abstract

The invention relates to a preparation method of a gas sensitive element used for hydrocarbon gas detection, which mainly solves the problems of complex synthesis process, high operating temperature and high processing cost in the prior art. The present invention comprises the following steps by adopting a method for preparing a gas sensitive element used for hydrocarbon gas detection: (1) pretreatment of the substrate: successively treating the substrate with acid and alkali and then drying to obtain the pretreated substrate; 2) Preparation of tin dioxide: adding SnCl to ethanol 2 2H 2 O, to obtain tin dioxide solution. (3) Preparation of tin dioxide film: put the obtained pretreated substrate into the tin dioxide solution to coat the film, then dry and dry to obtain the substrate coated with the tin oxide precursor. (4) Heat treatment: the technical solution of heating, roasting and cooling the substrate coated with the tin oxide precursor to obtain the tin oxide thin film gas sensor better solves the above problems and can be used in hydrocarbon gas detection.

Description

technical field [0001] The invention relates to a preparation method of a gas sensor 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 the accident ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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