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Porous silicon based gas sensor and method for detecting gas by porous silicon based gas sensor

A gas sensor and porous silicon-based technology, applied in the field of sensor detection, can solve the problems of high energy consumption of gas sensors, incapable of dynamic gas detection, long activation time, etc., and achieve the effect of reducing energy consumption, low cost, and low energy consumption

Inactive Publication Date: 2018-10-02
SHANGHAI IND U TECH RES INST
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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a porous silicon-based gas sensor and its application method for gas detection, which is used to solve the problem of high energy consumption, long activation time, and inability to detect gas sensors in the prior art. The problem of continuous dynamic detection of gas

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  • Porous silicon based gas sensor and method for detecting gas by porous silicon based gas sensor

Examples

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Embodiment 1

[0039] Example 1 Meat freshness detection (concentration detection of volatile basic nitrogen)

[0040] Meat can easily become contaminated and spoil. Volatile basic nitrogen refers to the action of enzymes and bacteria in animal food, which decomposes protein to produce alkaline nitrogen-containing substances such as ammonia and amines during the spoilage process. The freshness can be judged by detecting the concentration of volatile basic nitrogen released by meat (Chinese fresh meat volatile basic nitrogen detection standard: ≤150mg / kg [Chinese national standard GB / T5009.44-2003]). Meat put in the refrigerator is easy to be forgotten for too long, and meat spoilage is a continuous process: as the spoilage time prolongs, rotten meat will continue to release volatile base nitrogen (a process that continues to increase). The double-layer porous silicon in the invention is obtained by anodic oxidation of a single crystal silicon wafer in a hydrofluoric acid solution, and can b...

Embodiment 2

[0041] Embodiment 2 fruit ripeness detection (the concentration detection of ethylene)

[0042] Fruits release ethylene during the natural ripening process, and the closer the fruit is to ripeness, the greater the ethylene content, and once the fruit is ripe, the ethylene content drops again. The detection method in the present invention can also be used to test the ripeness of fruit. In this example, the double-layer porous silicon obtained by the anodic oxidation method in the mixed solution of hydrofluoric acid and nitric acid is subjected to liquid-phase modification. The specific method is to put the double-layer porous silicon into the acidic permanganese Potassium acid solution soaked, and then removed for surface drying.

[0043] Specifically, ethylene can undergo a redox reaction with potassium permanganate, and the reaction equation is as follows: 5CH 2 =CH 2 +12KMnO 4 +18H 2 SO 4 →12MnSO 4 +6K 2 SO 4 +10CO 2 +28H 2 O. In this embodiment, the fruit to be ...

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Abstract

The invention provides a porous silicon based gas sensor and a method for detecting gas by the porous silicon based gas sensor. The porous silicon based gas sensor comprises double-layer modified porous silicon comprising lower-layer porous silicon and upper-layer porous silicon which are modified by the same method; the lower-layer porous silicon is communicated with the upper-layer porous silicon; the bottom of the lower-layer porous silicon is closed; gas adsorbed by the upper-layer porous silicon can enter the lower-layer porous silicon; the average pore size of the upper-layer porous silicon is larger than that of the lower-layer porous silicon; and the modification method of the double-layer porous silicon comprises a gas-phase method or a liquid-phase method. The porous silicon based gas sensor can be used for continuously detecting gas, can still play a role after power failure, and has the advantages of being low in energy consumption, free of activation and low in cost. Meanwhile, the porous silicon preparation is simple and low in cost, problems such as cyclic utilization need not to be considered, and the porous silicon based gas sensor can be directly abandoned or replaced in practical application.

Description

technical field [0001] The invention belongs to the field of sensor detection, and relates to a porous silicon-based gas sensor and a method for applying it to gas detection. Background technique [0002] Porous silicon (porous silicon) has attracted widespread attention due to its simple preparation method, low cost and excellent performance. It is mainly a material with a loose structure prepared on a single crystal silicon substrate by chemical or electrochemical corrosion. According to the pore size, it can be divided into microporous silicon (<2nm), mesoporous silicon (2-50nm) and macroporous silicon (>50nm). Porous silicon has a large specific surface area and high surface chemical activity, and is easy to adsorb various gas molecules, which can effectively realize the detection of different gases [Sensors and Actuators B: Chemical, 2003, 9: 263-270]. [0003] The detection principle of porous silicon-based gas sensors is mainly based on the changes in the phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/00G01N27/22G01N27/227G01N27/228
Inventor 焦继伟袁素珺
Owner SHANGHAI IND U TECH RES INST
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