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Organic gas sensing method

A technology of organic gas and sensing method, which is applied in the fields of environmental monitoring and optical sensors, can solve the problems of inability to meet the needs of gas sensing and low sensitivity, and achieve the effect of low cost and convenient realization

Inactive Publication Date: 2009-08-12
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of sensing small molecules of chemical gases by using localized surface plasmon resonance (LSPR) of metal nanoparticles, some people have initially proposed the use of metal nanospheres made by chemical synthesis for sensing, but the sensitivity is very low, which cannot meet the current requirements. The need for gas sensing

Method used

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Examples

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Embodiment 1

[0029] Example 1, using the sensing method of the present invention to complete the detection of butanol gas.

[0030] (1) Select K9 glass with a size of 10mm×20mm×2mm as the sensor chip substrate, and clean and dry the substrate;

[0031] (2) Utilize nanosphere photolithography to make a layer of triangular silver nanoarrays on the above-mentioned selected glass substrate, such as figure 1 The first structure in (A), the triangle side length is 127nm, the period is 400nm, figure 2 is the corresponding SEM photo;

[0032] (3) The sensor chip containing the triangular silver nanostructure obtained by step (2) is immersed in a concentration of 2.5 × 10 -4 M in mycophenolic acid (MPA) solution (solvent is ethanol) for three minutes to form a layer of molecular film sensitive to butanol gas, such as figure 1 (B);

[0033] (4) Step (3) gained structure is placed in the air that contains butanol molecule, and the molecular film of structure top layer absorbs the butanol molecul...

Embodiment 2

[0037] Embodiment 2, using the sensing method of the present invention to complete the detection of p-xylene gas.

[0038] (1) Select K9 glass with a size of 10mm×20mm×2mm as the sensor chip substrate, and clean and dry the substrate;

[0039] (2) Utilize electron beam lithography to make diamond-shaped gold nanostructures on the above-mentioned selected substrate, such as figure 1 In the fourth structure in (A), the length of the bottom side is 120nm, the angle between the two sides is 60°, the vertical height is 50nm, and the period is 400nm;

[0040] (3) The diamond-shaped gold nanostructure obtained by step (2) is immersed in a concentration of 5 × 10 -4 M in the thiophenol (BT) solution (solvent is ethanol) for three minutes, form a layer of p-xylene gas comparatively sensitive molecular film, as figure 1 (B);

[0041] (4) the structure obtained in step (3) is placed in the air containing xylene, and the molecular film on the surface layer of the structure absorbs xyle...

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Abstract

The invention discloses a method for sensing organic gas, which is characterized by comprising the following steps: selecting a sensing chip substrate with an appropriate model according to the need of the transmission wavelength, and cleaning and drying the substrate; producing a metal nanometer structure array on the substrate to obtain a sensing chip; combining a layer of gas sensitive film on the metal nanometer structure array according to the variety of gas to be detected; utilizing a light source to irradiate the sensing chip after certain organic gas is absorbed, and then using a spectrum tester to probe transmitted light to obtain an extinction spectrum; and analyzing the extinction spectrum to obtain concentration information of the gas. The method for sensing the organic gas has the advantages of convenience, easiness, quick response speed, low cost and the like, and can be used in aspects such as environmental detection, explosive detection, food security and the like.

Description

technical field [0001] The invention relates to the technical field of optical sensors, in particular to a gas sensor suitable for the field of environmental monitoring. Background technique [0002] With the rapid development of society and the rapid advancement of science and technology, environmental pollution is becoming more and more serious. Some toxic and harmful gases are often used and produced in chemical production and decoration materials, which seriously threaten people's life and health. Therefore, the study of these gas sensors for environmental monitoring and the exploration of new gas sensing methods have become increasingly concerned issues. [0003] Surface plasmon resonance (SPR) is a physical optical phenomenon of surfaces. When the incident light wave is totally reflected at the interface of the metal film, and the frequency of the incident light wave is the same as the resonance frequency of the free electrons on the surface of the metal film, the sur...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 马文英杨欢刘娟意姚军李飞
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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