Ternary composite gas sensing chip, preparation method, application method, and gas sensing material

A gas sensing and ternary composite technology, applied in the field of gas sensing, can solve the problems of large error, cumbersome operation process, and difficulty in industrialization, and achieve the effects of improving response sensitivity, realizing recognition ability, and improving gas selectivity

Pending Publication Date: 2021-12-14
杭州汇馨传感技术有限公司 +1
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Problems solved by technology

However, the above-mentioned self-assembly usually requires more than a dozen or even dozens of layers, and the actual operation process is ...

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  • Ternary composite gas sensing chip, preparation method, application method, and gas sensing material
  • Ternary composite gas sensing chip, preparation method, application method, and gas sensing material
  • Ternary composite gas sensing chip, preparation method, application method, and gas sensing material

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preparation example Construction

[0043] Such as figure 1 As shown, the present invention discloses a method for preparing a ternary composite gas sensor chip, comprising the following steps:

[0044] Step 1: Mix an equal volume of graphene oxide solution and metal ion solution, shake evenly, add a small amount of PDDA (Poly dimethyl dially ammonium chloride, polydiallyl dimethyl ammonium chloride), shake on the shaker Overnight, then centrifuged and washed several times with deionized water, and redispersed in an equal amount of deionized water to obtain a self-assembled suspension material;

[0045] Step 2: Use PDMS film to confine the ITO-PET interdigitated electrodes, and perform oxygen plasma treatment on the electrodes. Drop-coat the self-assembled suspension material prepared in Step 1 on the electrodes, dry them on the heating plate, and use Nitrogen purging, followed by reducing in reducing steam for 10-20min at 60-100°C to obtain a ternary composite gas sensor chip unit, and single or multiple terna...

Embodiment 1

[0058] This embodiment provides a method for preparing a ternary composite gas sensor chip using a molybdenum disulfide solution, and the specific steps are as follows:

[0059] Step 1: Add 0.5ml of 10mM molybdenum disulfide solution to an equal volume of 0.5mg / mL graphene oxide solution, shake evenly, then add 15μL of 1% Wt. PDDA with a molecular weight less than 100kDa, shake overnight in a shaker , then centrifuged and washed 3 times with deionized water, and redispersed in an equal amount of deionized water to obtain a self-assembled suspension material;

[0060] Step 2: Use PDMS membrane to confine the ITO-PET interdigitated electrode, and treat the electrode with oxygen plasma. Take 10 μL of the self-assembled suspension material prepared in step 1 and drop-coat it on the electrode, and dry it on the heating plate. , purged with nitrogen, and then reduced in hydrazine hydrate vapor at 80°C for 15 minutes to obtain a ternary composite gas sensor chip unit, and a single or...

Embodiment 2

[0062] This embodiment provides a method for preparing a ternary composite gas sensor chip using a cobalt chloride solution, and the specific steps are as follows:

[0063] Step 1, add 0.5ml of 10mM cobalt chloride solution to an equal volume of 0.5mg / mL graphene oxide solution, shake evenly, and then add 15μL of 1% Wt. PDDA with a molecular weight between 100-200kDa. The shaker was shaken overnight, then centrifuged and washed with deionized water for 3 times, and redispersed in the same amount of deionized water to obtain the self-assembled suspension material;

[0064]Step 2: Use PDMS membrane to confine the ITO-PET interdigitated electrode, and treat the electrode with oxygen plasma. Take 10 μL of the self-assembled suspension material prepared in step 1 and drop-coat it on the electrode, and dry it on the heating plate. , purged with nitrogen, and then reduced in hydrazine hydrate vapor at 70°C for 15 minutes to obtain a ternary composite gas sensor chip unit, and single ...

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Abstract

The invention discloses a ternary composite gas sensing chip, a preparation method, an application method and a gas sensing material. The preparation method comprises the steps: 1, mixing a graphene oxide solution and a metal ion solution which are equal in volume, adding a trace amount of PDDA, oscillating the mixture on an oscillator overnight, then conducting centrifugal washing with deionized water for multiple times, and re-dispersing in the same amount of deionized water to obtain a self-assembled suspension material; and 2, carrying out range limitation on the ITO-PET interdigital electrode by using a PDMS film, carrying out oxygen plasma treatment on the electrode, dispensing the self-assembled suspension material on the electrode, drying on a heating plate, purging by using nitrogen, and then reducing in reducing steam. According to the preparation method and the application method of the ternary composite gas sensing chip, two negatively charged two-dimensional materials are microcosmically assembled layer by layer for compounding in a liquid phase, and the problems that two two-dimensional materials with the same charges cannot realize liquid-phase assembly and a macroscopic layer-by-layer assembly process is tedious and difficult to industrialize are solved.

Description

technical field [0001] The invention belongs to the technical field of gas sensing, and in particular relates to a ternary composite gas sensing chip, a preparation method, an application method and a gas sensing material. Background technique [0002] Graphene is a two-dimensional crystalline material composed of a carbon monolayer, and each C atom is represented by SP 2 The hybrid orbitals constitute a hexagonal honeycomb structure with large specific surface area and high room temperature carrier mobility. The excellent electrochemical properties of graphene make it widely used in the field of gas sensors. However, pure graphene is a zero-bandgap semiconductor, and electrons can flow freely inside it like a metal, which limits its application as a gas sensor to a certain extent. In recent years, researchers have compounded graphene with other materials or modified graphene covalently / non-covalently to adjust the band gap of graphene and improve its gas sensing performan...

Claims

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Application Information

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IPC IPC(8): G01N27/00B32B9/00B32B9/04B32B33/00
CPCG01N27/00B32B9/007B32B9/00B32B9/04B32B33/00
Inventor 邬建敏刘雪梅
Owner 杭州汇馨传感技术有限公司
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