Gas sensor array and method for identifying three alcohol types and concentrations thereof

A gas sensor and array technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as unrecognizable structures and properties similar to gas molecules, and achieve the effect of improving recognition performance and enhancing stability

Active Publication Date: 2021-06-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages that the metal oxide gas sensor in the prior art cannot identify gas molecules with similar structure, properties and similar concentration, and to provide a metal oxide gas sensor array and a metal oxide gas sensor array. Method for recognizing the type and concentration of methanol or ethanol or isopropanol by a gas sensor array

Method used

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  • Gas sensor array and method for identifying three alcohol types and concentrations thereof
  • Gas sensor array and method for identifying three alcohol types and concentrations thereof
  • Gas sensor array and method for identifying three alcohol types and concentrations thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A solution method is used to prepare a semiconductor gas sensor array coated with a metal oxide sensitive film, and the specific steps are as follows:

[0040] Step 1, get four parts of 1.5mL deionized aqueous solutions of nickel acetate with a concentration of 0.5mol / L and number them 1, 2, 3, and 4 respectively. Under the condition of magnetic stirring, add 11.1mg of scandium nitrate, 3 Add 4.59mg lithium acetate to No. 4 aqueous solution, add 11.1mg scandium nitrate and 4.59mg lithium acetate to No. / L of sodium hydroxide, after being fully dissolved, keep warm in an oil bath at 100°C for 20-60 minutes, flocculent precipitates will form, wash the flocculent precipitates with deionized water and ethanol three times, and dry in an oven at 70°C Bake for 24 hours and set aside;

[0041] Step 2, place the above-mentioned dried powder in a quartz boat, heat to 500°C in an air atmosphere, and keep it warm for 2 hours to obtain pure, scandium-doped, lithium-doped, and scand...

Embodiment 2

[0045] Using the nickel oxide gas sensor array prepared in Example 1 to identify the type and concentration of methanol, ethanol, and isopropanol, specifically includes the following steps:

[0046] Step 1. Place the 4-way metal oxide gas sensor array in the gas-sensing test chamber. Under the flowing air atmosphere, the program controls the sensor to perform program cooling. The initial temperature is 100-300°C, the end temperature is 50°C, and the cooling rate is 75-167°C / min, get the resistance signal R of the 4-way metal oxide gas sensor array in the air background air，n (t), n represents the 1st-4th gas sensor, and t represents time;

[0047] Step 2, under the same temperature waveform as step 1, test the thermal modulation response signal of n-way (n≥4) metal oxide gas sensor arrays under the set concentration of methanol, repeat the acquisition more than 5 times, and obtain n-way gas The thermally modulated resistance signal set of the sensor array under different conc...

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Abstract

The invention discloses a metal oxide gas sensor array and a method for identifying the type and concentration of methanol or ethanol or isopropanol by using the gas sensor array. The sensor array comprises sensors coated with n different nickel oxide sensitive films, the nickel oxide sensitive films are prepared through a solution method, and the types and recognition performance of the metal oxide sensitive films are expanded through doping of different metal ions; Furthermore, thermal modulation resistance response signals of the sensor array to methanol, ethanol or isopropanol with different concentrations and types are tested through variable-temperature thermal modulation, and then normalization processing of thermal modulation sensitivity response signals is carried out; mapping (calibration) between methanol or ethanol or isopropanol with different concentrations and a normalized sensitivity signal is established through a supervised learning algorithm, then types and concentrations of the three alcohols are identified, and the method can be widely applied to quantitative identification and detection of types and concentrations of other volatile organic compounds very easily.

Description

technical field [0001] The invention relates to the technical field of electronic devices, in particular to a metal oxide gas sensor array and a method for identifying the type and concentration of methanol, ethanol or isopropanol by using the metal oxide gas sensor array. Background technique [0002] As one of the most important chemical raw materials, methanol, ethanol and isopropanol are widely used in chemical industry, energy, catalysis and other fields. The three alcohols have similar chemical properties, especially methanol and ethanol. Methanol has a similar smell to ethanol, which is difficult to distinguish sensory. However, methanol is far more toxic than ethanol and isopropanol. Methanol will be oxidized into formaldehyde and formic acid which are more toxic than methanol in the metabolism of the human body. If you drink more than 4ml of methanol by mistake, you will have symptoms of poisoning, including abdominal pain, vomiting, diarrhea, headache, dizziness, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125G01N27/127Y02A50/20
Inventor 孟钢李蒙邓赞红方晓东
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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