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Thin film sensor for detecting carbon dioxide and application of thin film sensor

A thin-film sensor and carbon dioxide technology, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators, etc., can solve the problem of large volume, long time for patients to carry monitoring platforms, and complex structures. and other issues to achieve the effect of large specific surface area

Inactive Publication Date: 2015-09-09
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of non-dispersive infrared spectroscopy to monitor carbon dioxide requires high equipment requirements. The relevant equipment is expensive, bulky, and is subject to large interference from water vapor, which is prone to high noise and unstable measurement results.
Moreover, due to the complex structure and bulky size of its instruments and equipment, it takes a long time to install a monitoring platform for patients during medical carbon dioxide monitoring, which can easily delay the critical timing of monitoring and rescue; therefore, it is not suitable for applications that require rapid carbon dioxide monitoring

Method used

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  • Thin film sensor for detecting carbon dioxide and application of thin film sensor
  • Thin film sensor for detecting carbon dioxide and application of thin film sensor
  • Thin film sensor for detecting carbon dioxide and application of thin film sensor

Examples

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Effect test

Embodiment 1

[0047] In this example, thymol blue is used as the indicator, the cation of the carrier complex is quaternary ammonium ion, the anion is hydroxide ion, and the porous film is nylon 6 material. The specific preparation is as follows:

[0048] Dissolve 5.0g of tetraoctylammonium bromide and 0.74g of hexadecyltrimethylammonium bromide in methanol into a 15ml solution, put it into a 50ml flask, and slowly add 1.82g of silver oxide under vigorous stirring powder. Vigorously stirred at room temperature for one hour and then filtered to obtain a methanol solution of mixed alkylammonium hydroxides, which was colorless or pale yellow. Dissolve 0.02g of thymol blue solid powder in 2ml, 0.7mol / L methanol buffer solution of mixed alkylammonium hydroxide, shake slightly to fully dissolve the solid, and the solution is dark blue at this time. In another flask, 5ml of toluene was added, and 1g of ethyl cellulose powder was slowly added to the flask under vigorous stirring to make it fully ...

Embodiment 2

[0070] In this example, m-cresol violet is used as the indicator, the cation of the carrier complex is quaternary ammonium ion, the anion is hydroxide ion, and the porous matrix film is nylon 6 material. The specific preparation is as follows:

[0071]Dissolve 5.74g of dodecyltrimethylammonium bromide with methanol to a solution of 15ml, put it into a 50ml flask, and add 1.82g of silver oxide powder under vigorous stirring. Stir at room temperature for one hour and then filter to obtain a methanol solution of dodecyltrimethylammonium hydroxide, which is colorless or light yellow. Dissolve 0.02g m-cresyl violet solid powder in 2ml, 0.7mol / L methanol solution of dodecyltrimethylammonium hydroxide, shake slightly to fully dissolve the solid, and the solution is now purple. In another flask, 5ml of toluene was added, and 1g of ethyl cellulose powder was slowly added to the flask under vigorous stirring to make it fully dissolved, and then 1g of monodisperse porous silica microsph...

Embodiment 3

[0077] In this example, thymol blue and phenol red were used as indicators, quaternary ammonium ions were used as cations of the carrier complex, hydroxide ions were used as anions, and nylon 6 material was used for the porous matrix film. The specific preparation is as follows:

[0078] Dissolve 5.74g of tetraoctylammonium bromide with methanol to a solution of 15ml, put it into a 50ml flask, and add 1.82g of silver oxide powder under vigorous stirring. Stir at room temperature for one hour and then filter to obtain tetraoctyl ammonium hydroxide methanol solution, which is colorless or light yellow. Dissolve the solid powder of 0.01g thymol blue and 0.01g phenol red in 2ml, 0.7mol / L methanol solution of tetraoctyl ammonium hydroxide, and shake slightly to fully dissolve the solid. At this time, the solution is blue-purple. That is, the indicator methanol buffer solution. In another flask, 5ml of toluene was added, and 1g of ethyl cellulose powder was slowly added to the fla...

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Abstract

The invention discloses a thin film sensor for detecting carbon dioxide. The sensor comprises a porous film and an indicator and a carrier complex which are attached to the pore passage of the porous film, wherein the indicator can react with hydrogen ions and presents different colors in a protonation state and a deprotonation state; the carrier complex contains positive ions and alkaline negative ions, wherein the positive ions can be chemically connected with the deprotonated indicator in a solid phase; and according to the alkaline negative ions, the pH value in the pore passage is higher than a pKa value of the indicator in the absence of contact of carbon dioxide. According to the thin film sensor disclosed by the invention, the porous film serves as a carrier, and the characteristic that the specific surface area is large is utilized, so that the carbon dioxide can be fully contacted with the indicator, the sensitivity of the sensor is improved, and the response time is reduced. The sensor disclosed by the invention is simple in structure, convenient to use, easy to carry and low in cost and has the advantages of accuracy, rapidness, water disturbance resistance, reaction reversibility and the like, and the requirement on rapid detection of carbon dioxide can be met.

Description

technical field [0001] This application relates to the field of carbon dioxide detection, in particular to a thin film sensor for carbon dioxide detection and its application. Background technique [0002] Medical carbon dioxide monitoring and environmental carbon dioxide monitoring are two fields where carbon dioxide monitoring is widely used. Among them, medical carbon dioxide monitoring, that is, clinical end-tidal carbon dioxide detection, including end-tidal carbon dioxide detection, inhaled carbon dioxide detection, etc., is one of the important monitoring parameters for critical patients in clinical ICU, OR and other key departments. Environmental carbon dioxide detection includes atmospheric carbon dioxide detection, water carbon dioxide detection, greenhouse vegetable carbon dioxide detection and indoor carbon dioxide detection, etc. Whether it is medical carbon dioxide monitoring or environmental carbon dioxide monitoring, high accuracy and fast response are the k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 洪梅张健严义勇赵劲
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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