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Polyaniline@silver nanowire/polyimide porous gradient composite film, and preparation method and application thereof

A technology of silver nanowires and polyimide, applied in the direction of instruments, analytical materials, measuring devices, etc., can solve the problems of hindering the contact between sensitive materials and gases, achieve good flexibility, increase adsorption active sites, and increase specific surface area Effect

Active Publication Date: 2020-06-05
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, embedding sensitive materials in a flexible matrix will hinder the contact between sensitive materials and gases

Method used

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  • Polyaniline@silver nanowire/polyimide porous gradient composite film, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0028] The preparation method of the polyaniline@silver nanowire / polyimide porous gradient composite film in this embodiment is as follows:

[0029] (1) Preparation of the blend: 0.1g sodium chloride and 0.05g silver nanowires are added to the polyamic acid / dimethylformamide solution, and the stirring is continued to disperse evenly to form a blend; wherein, the chlorinated The mass ratio of sodium, polyamic acid and silver nanowires is 0.1:1:0.25; (2) Spin coating for the first time: Spin coating the above blend on a glass substrate to form a film, wherein the rotating speed is 700rmp / s, The time is 70s; (3) Spin coating for the second time: the polyamic acid / dimethylformamide solution that is not doped with sodium chloride and silver nanowires is spin-coated on the above-mentioned film, wherein, the rotating speed is 700rmp / s, Time 50s; (4) Curing: followed by heating and curing, in which, maintain at 100°C for 10 minutes, then maintain at 150°C for 20 minutes, then maintain...

Embodiment 2

[0031] The preparation method of the polyaniline@silver nanowire / polyimide porous gradient composite film in this embodiment is as follows:

[0032] (1) Preparation of the blend: Add 1g of sodium chloride and 0.2g of silver nanowires into the polyamic acid / dimethylformamide solution, and keep stirring to disperse evenly to form a blend; wherein, sodium chloride , the mass ratio of polyamic acid and silver nanowire is 0.7: 1: 0.65; (2) Spin coating for the first time: above-mentioned blend is spin-coated film-forming on glass substrate, and wherein, rotating speed is 700rmp / s, time (3) Spin coating for the second time: the polyamic acid / dimethylformamide solution that is not doped with sodium chloride and silver nanowires is spin-coated on the above-mentioned film, wherein, the rotating speed is 700rmp / s, and the time 50s; (4) Curing: followed by temperature rise curing, in which, maintain at 100°C for 10 minutes, then maintain at 150°C for 20 minutes, then maintain at 180°C fo...

Embodiment 3

[0034] The preparation method of the polyaniline@silver nanowire / polyimide porous gradient composite film in this embodiment is as follows:

[0035] (1) Preparation of the blend: 0.5g sodium chloride and 0.1g silver nanowires are added to the polyamic acid / dimethylformamide solution, and the stirring is continued to disperse evenly to form a blend; wherein, the chlorinated The mass ratio of sodium, silver nanowires and polyamic acid is 1.1:1:0.8; (2) Spin coating for the first time: spin-coat the above-mentioned blend on a glass substrate to form a film, wherein the rotating speed is 700rmp / s, The time is 70s; (3) Spin coating for the second time: the polyamic acid / dimethylformamide solution that is not doped with sodium chloride and silver nanowires is spin-coated on the above-mentioned film, wherein, the rotating speed is 700rmp / s, Time 50s; (4) Curing: followed by heating and curing, in which, maintain at 100°C for 10 minutes, then maintain at 150°C for 20 minutes, then mai...

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Abstract

The invention discloses a polyaniline@silver nanowire / polyimide porous gradient composite film and a preparation method and application thereof. The preparation method comprises the following steps: preparing a blend, carrying out primary spin coating, carrying out secondary spin coating and curing, removing a template, carrying out surface hydrophilicity treatment, treating in a dispersion liquid, washing with deionized water and ethanol for multiple times, and carrying out vacuum drying, thereby finally obtaining the polyaniline@silver nanowire / polyimide gradient composite film. Compared with the prior art, the preparation method has the beneficial effects that the porous structure effectively increases the specific surface area of the composite film, and the gradient structure ensures good mechanical properties of the composite film. The construction of a three-dimensional network of a sensitive material is realized by the polyaniline-loaded gradient composite film, so that the adsorption active sites of target gas are greatly increased. The film has the advantages of sensitivity to NO2 response, good flexibility, high mechanical strength and the like.

Description

technical field [0001] The invention relates to a special composite film for a flexible gas sensor, in particular to a polyaniline@silver nanowire / polyimide porous gradient composite film, a preparation method and an application. Background technique [0002] As flexible gas sensors have advantages over traditional gas sensors and broad application prospects in wearable devices, food health and environment monitoring, etc. The core components of flexible gas sensors are sensitive materials and flexible substrates. The current research is to deposit a layer of sensitive materials on flexible substrates by chemical deposition, spraying and other methods. However, this structure will cause sensitive material layers to occur during use. The phenomenon of cracking, or detachment from the flexible substrate, resulting in loss of gas sensing performance. Therefore, improving the interaction between sensitive materials and flexible substrates is of great significance for improving ...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08J9/40C08G73/02G01N27/12C08L79/08
CPCC08J9/42C08J9/405C08G73/0266G01N27/126G01N27/127C08J2379/08C08J2425/18C08J2479/02
Inventor 方芳黄志刚詹自立
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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