Fluorescence quenching type methane sensing device based on cryptophane-A-6Me

A technology of fluorescence quenching and sensing devices, which is applied in measuring devices, fluorescence/phosphorescence, and material analysis through optical means, can solve the problems of high requirements for silicon nanowire modification technology, and achieve the advantages of fluorescence emission, simple operation, The effect of highly selective sensing

Inactive Publication Date: 2019-10-01
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has a good linear response to methane gas with a concentration range from 0.1% to 3.5% (v / v), with a detection limit of 0.1% (v / v), good selectivity, and little interference from carbon tetrachloride and methylene chloride , but the modification process requirements for silicon nanowires are relatively high

Method used

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  • Fluorescence quenching type methane sensing device based on cryptophane-A-6Me
  • Fluorescence quenching type methane sensing device based on cryptophane-A-6Me

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] combined with figure 1 And attached figure 2 , the fluorescence quenching type methane sensing device based on Xana-A-6Me of the present invention includes a stainless steel test gas chamber 2 whose main body is a hollow cylinder, the top of the gas chamber is provided with an optical fiber inlet 11, and the bottom of the Y-shaped reflective optical fiber enters the test chamber through the inlet. Inside the gas chamber, there is a quartz glass slide 10 in the middle of the test gas chamber to fix the position of the optical fiber probe. The distance of the optical fiber probe can be adjusted through the bottom bracket 8. When the excitation light source 1 transmits light with a wavelength of 380nm through the upper left end of the Y-shaped reflective optical fiber to the sensing probe at the bottom of the optical fiber, the sensitive molecular hole in the fluorescent sensing element 8-A-6Me After being excited, blue-purple fluorescence is emitted, and the fluorescenc...

Embodiment 2

[0025] Preparation of fluorescent sensing element:

[0026]Weigh 0.01g of cryptophane-A-6Me, dissolve 0.5g of ethyl cellulose in 10mL of a mixed solvent of dichloroethane and absolute ethanol (v / v=1 / 1), stir at room temperature for 30 minutes, then sonicate for 2 hours, Transfer 50 μL to a polished and washed 1 cm×1 cm p-type silicon wafer with a pipette gun. Moist air with a relative humidity of 85% is blown to the substrate by an air pump to volatilize the solvent, and at the same time, the water vapor condenses and condenses into a large number of tiny water droplets. Finally, it is dried in a constant temperature drying oven at 60°C until the water and solvent are completely evaporated to form a fluorescent sensing element with a honeycomb porous structure. Place the fluorescent sensing element on the base of the air chamber, and screw it to 1cm away from the fiber optic probe. Taking gas standard gas with a methane concentration of 0-3.5% (v / v) as the object, the fluore...

Embodiment 3

[0032] Weigh cryptophane-A-6Me 0.01g, ethyl cellulose 0.3g is dissolved in the mixed solvent of 10mL dichloroethane and dehydrated alcohol (v / v=1 / 1) as film-forming solution, adopt and embodiment 2 The same method was used to prepare fluorescent sensing elements. Place the fluorescent sensing element on the base of the air chamber, and screw it to 1cm away from the fiber optic probe. The gas standard gas with known methane concentrations of 0, 0.6%, 1.0%, 1.5%, 2.0%, 2.5%, and 3.5% (v / v) is used for detection, and the logarithm ln[Q] of the concentrations are -0.51083, 0, 0.40541, 0.69315, 0.91629, 1.25276, the corresponding fluorescence quenching intensity ln(F 0 / F-1) are -5.19728, -4.73632, -4.3453, -4.10936, -3.97434, -3.57328, respectively. Its linear regression equation is: ln(F 0 / F-1)=0.90ln[Q]-4.73, correlation coefficient R 2 is 0.995, that is, k and b in the linear regression equation are 0.90 and -4.73 respectively.

[0033] When the methane gas to be measured...

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Abstract

The invention discloses a fluorescence quenching type methane sensing device based on cryptophane-A-6Me, and belongs to the technical field of optical fiber sensing. The methane sensing device disclosed by the invention selects cryptophane-A-6Me as a sensitive molecule, the cryptophane-A-6Me is combined with ethyecellulose, a water vapor assistance method is used for forming a sensitive membrane,and the sensitive membrane is coated to a p-type silicon wafer. The device fully utilizes the advantages that ethyecellulose has good thermal stability and a porous membrane is likely to be formed, and also utilizes the high selectivity response of the cryptophane molecule for methane gas, the high sensitivity and high selectivity detection of methane concentration can be realized according to fluorescence intensity change before and after the response of the cryptophane molecule, and the methane sensing device has the advantages of simple operation process, low cost and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a fluorescence quenching methane sensing device based on Anban-A-6Me for detecting methane concentration. Background technique [0002] Methane is the main component of methane gas. In the process of coal mining, the leakage of methane gas is very easy to explode and cause coal mine accidents. During the development of a large number of coal resources, mining disasters occur from time to time, and once they occur, national life and property suffer huge losses. At the same time, methane is also an important component of natural gas. There are also major safety hazards in the process of natural gas exploitation, storage, transportation and use. Therefore, real-time monitoring of methane concentration has practical significance. [0003] At present, gas detection in coal mine operations can be mainly realized through thermal catalytic gas detection equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 李昱黎学明杨建春赵鑫
Owner LINYI UNIVERSITY
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