Method for making gas sensor based on natural color-sensitive material and porous TiO2 film

A technology of a gas sensor and a manufacturing method, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials, etc., which can solve the problems of narrow detection range, high cost, and unsuitability, and achieve The effect of wide detection range and high sensitivity

Inactive Publication Date: 2012-10-31
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of gas-sensitive material has fast color development and obvious changes, but it also has limitations, such as its high cost, the chemical components contained are harmful to the human body, and it is not suitable for food detection, etc.
The same type of gas sensor is only sensitive to a certain type of gas, so the existing gas sensors have defects such as narrow detection range and easy to be affected by environmental humidity

Method used

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  • Method for making gas sensor based on natural color-sensitive material and porous TiO2 film
  • Method for making gas sensor based on natural color-sensitive material and porous TiO2 film
  • Method for making gas sensor based on natural color-sensitive material and porous TiO2 film

Examples

Experimental program
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Embodiment 1

[0023] Follow the steps below to implement:

[0024] 1. Choose one of silicon wafer, glass wafer, conductive glass wafer and polytetrafluoroethylene wafer as the substrate.

[0025] 2. Make gold or platinum electrodes on the substrate 1 by screen printing or plasma sputtering, such as figure 1 Substrate 1 and electrode 2 in.

[0026] 3. In this embodiment, TiO is prepared by sol-gel method 2 Porous membrane: weigh 1g TiO 2 Dissolve the powder in 2mL, 90%~100% acetic acid solution and 0.05mL, 90%~100% acetylacetone solution, grind in a mortar for 10min, then dissolve 0.5mL, 90%~100% OP emulsifier in 0.5 Add mL, 90%~100% alcohol slowly into the mortar, and continue grinding for 10min to make TiO 2 glue. Put the substrate 1 with the electrode 2 into 10% acetone solution, soak it for 12h, then dry it, and put the TiO 2 Apply the glue evenly on the substrate, dry it naturally for 10 minutes, put it in a muffle furnace at 300 °C for 1 hour, and make TiO after cooling. 2 Porou...

Embodiment 2

[0030] Follow the steps below to implement:

[0031] 1. Choose one of silicon wafer, glass wafer, conductive glass wafer and polytetrafluoroethylene wafer as the substrate.

[0032] 2. Make gold or platinum electrodes 2 on the substrate 1 by screen printing or plasma sputtering, such as figure 1 shown.

[0033] 3. In this embodiment, TiO is prepared by sol-gel method 2 For porous membrane, weigh 2.5g TiO 2 Dissolve the powder in 6mL, 90%~100% acetic acid solution and 0.3mL, 90%~100% acetylacetone solution, grind in a mortar for 20min, and then dissolve 0.3mL, 90%~100% OP emulsifier in 3mL, 90% Slowly add %~100% alcohol into the mortar and continue grinding for 20 minutes to make TiO 2 glue. Substrate 1 with electrode 2 is put into 20% acetone solution and dried after soaking for 24h, and TiO 2 Apply the glue evenly on the substrate, dry it naturally for 20 minutes, put it in a muffle furnace at 400 ° C for 2 hours, and make TiO after cooling. 2 Porous membrane3, such as...

Embodiment 3

[0037] Follow the steps below to implement:

[0038] 1、 One of silicon wafer, glass wafer, conductive glass wafer and polytetrafluoroethylene wafer is selected as the substrate.

[0039] 2. Make gold or platinum electrodes 2 on the substrate 1 by screen printing or plasma sputtering, such as figure 1 shown.

[0040] 3. Preparation of TiO by sol-gel method 2 Porous membrane: weigh 5g TiO 2 Dissolve the powder in 10mL, 90%~100% acetic acid solution and 0.5mL, 90%~100% acetylacetone solution and grind in a mortar for 40min, then dissolve 0.5mL, 90%~100% OP emulsifier in 5mL, 90 Slowly add %~100% alcohol into the mortar and continue grinding for 40 minutes to make TiO 2 glue. Soak the substrate with electrodes in 40% acetone solution for 48h and then dry it, and put the TiO 2 Apply the glue evenly on the substrate, let it dry naturally for 40 minutes, put it into a muffle furnace at 500°C for sintering for 3 hours, and make TiO after cooling. 2 Porous membrane3, such as ...

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Abstract

The invention discloses a method for making a gas sensor based on a natural color-sensitive material and a porous TiO2 film. The method comprises the steps of: selecting a substrate suitable for being coated, making an electrode on the substrate with a coating method, and preparing the porous TiO2 film for the substrate coated with the electrode with a sol-gel method; specific to gas to be detected, selecting a proper natural color-sensitive material, and dissolving the natural color-sensitive material into a solvent compatible with the natural color-sensitive material to form a natural color-sensitive material solution with the concentration of 0.1-0.5mol / L; and soaking the porous TiO2 film into the natural color-sensitive material solution for 12-48 hours, taking out the porous TiO2 film, washing the porous TiO2 film with absolute ethyl alcohol completely to remove impurities, airing, and drying in a drying oven at 30-80 DEG C for 1-5 hours. The prepared sensor is higher in sensitivity and wider in detection range, can work at room temperature, is safe and nonhazardous, and is slightly influenced by ambient humidity because pigment molecules wrap TiO2 molecules and fill gaps among TiO2 crystals at the same time.

Description

technical field [0001] The present invention relates to a kind of manufacturing method of gas sensor; 2 ) A film-forming method for making base materials, and a method for making gas sensors using natural pigments as sensitive and intensified materials for color-sensitive materials. Background technique [0002] A gas sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. It is mainly divided into traditional and visual types. Traditional types include conductive sensors, piezoelectric sensors, field effect sensors, and optical fiber sensors. The visual gas sensor technology that has emerged in recent years is a technology for qualitative and quantitative analysis of the gas to be detected based on the color change before and after the reaction between the specific gas-sensitive material and the gas to be detected. The gas-sensitive material is generally a porphyrin compound and a hydrophobic pH Indicators (see Chinese Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 邹小波黄晓玮石吉勇陈正伟张德涛
Owner JIANGSU UNIV
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