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Vertical response gas sensor based on three-dimensional porous graphene ultrathin film and its preparation method

A gas sensor and porous graphene technology, applied in the sensor field, can solve the problems of slow response and recovery of graphene thin film sensors, affecting the gas sensing performance of the sensor, and reducing the contact area, etc., which is conducive to low-cost large-scale preparation, solution The effect of processing electrodes or substrates, simplifying the preparation steps

Active Publication Date: 2019-09-17
砥创(苏州)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sensors composed of a single graphene sheet have disadvantages such as poor repeatability and low stability caused by a single sheet rupture. Constructing a graphene sheet film network has become one of the most effective methods for preparing high-efficiency graphene sensors.
However, in the process of constructing the graphene film network, due to the layer stacking effect, the contact area between the graphene sheets and gas molecules in the film is likely to be greatly reduced, thus affecting the gas sensing performance of the sensor.
[0003] Existing graphene film gas sensors generally adopt the structure of planarly arranged electrodes, that is, the positive and negative electrodes are located in the plane of the film, and when the current migrates in the graphene plane, the carriers will be delayed by the gas molecules attached to the graphene surface. Influence, which leads to the problem of slow response and recovery of graphene thin film sensors commonly studied at present

Method used

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  • Vertical response gas sensor based on three-dimensional porous graphene ultrathin film and its preparation method
  • Vertical response gas sensor based on three-dimensional porous graphene ultrathin film and its preparation method
  • Vertical response gas sensor based on three-dimensional porous graphene ultrathin film and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0043] A method for preparing a vertically responsive gas sensor based on a three-dimensional porous graphene ultra-thin film, comprising the following steps:

[0044] 1. After ultrasonic dispersion of 1 mg / mL graphene oxide aqueous solution obtained by Hummers method in 200 mL for 5 hours, add 90 mL of 5 wt% hydrogen peroxide solution, and then add 1 mL of ferrous sulfate solution with a concentration of 20 mM, 100 Hz ultrasonic dispersion for 30 min to form a graphene oxide dispersion, and then add hydrochloric acid to make the pH value reach 4;

[0045] 2. Place the above graphene oxide dispersion under a 2000 W UV lamp for reaction etching for 40 s, place it in a dialysis bag (molecular weight cut-off of 10,000) and dialyze it for a week to obtain a negatively charged porous graphene dispersion, which is obtained by rotary evaporation The obtained negatively charged porous graphene dispersion was concentrated into 1mg / mL by instrument;

[0046] 3. Add 1000 mg of p-phenyle...

Embodiment 2

[0050] A method for preparing a vertically responsive gas sensor based on a three-dimensional porous graphene ultra-thin film, comprising the following steps:

[0051] 1. After ultrasonic dispersion treatment of 2 mg / mL graphene oxide aqueous solution obtained by 200 mL Hummers method for 5 hours; add 70 mL of 4wt% hydrogen peroxide solution, then add 1 mL of ferrous sulfate solution with a concentration of 15 mM, and 80Hz ultrasonic Disperse for 40 min to form a graphene oxide dispersion, then add hydrochloric acid to make the pH value reach 4;

[0052] 2. Place the above graphene oxide dispersion under 2500 W UV lamp for reaction etching for 30 s, then place it in a dialysis bag (molecular weight cut-off of 10,000) and dialyze for one week to obtain a negatively charged porous graphene dispersion, which is obtained by rotary evaporation The obtained negatively charged porous graphene dispersion was concentrated into 1mg / mL by instrument;

[0053] 3. Add 1000 mg of p-phenyle...

Embodiment 3

[0056] A method for preparing a vertically responsive gas sensor based on a three-dimensional porous graphene ultra-thin film, comprising the following steps:

[0057] 1. After ultrasonic dispersion treatment of 1 mg / mL graphene oxide aqueous solution obtained by 200 mL Hummers method for 5 hours; add 80 mL of hydrogen peroxide solution with a concentration of 8 wt %, and then add 1 mL of ferrous sulfate solution with a concentration of 15 mM, and ultrasonicate at 50 Hz Disperse for 30 min to form a graphene oxide dispersion, then add hydrochloric acid to make the pH value reach 4;

[0058] 2. Place the above graphene oxide dispersion under a 3000 W UV lamp for reaction etching for 70 s, place it in a dialysis bag (molecular weight cut-off of 10,000) and dialyze for a week to obtain a negatively charged porous graphene dispersion, which is obtained by rotary evaporation The obtained negatively charged porous graphene dispersion was concentrated into 1mg / mL by instrument;

[0...

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Abstract

The invention discloses a three-dimensional porous graphene ultrathin film based vertical responding gas sensor and preparation method thereof. The preparation method of the gas sensor is achieved through the following four steps: a preparation of negatively charged porous graphene dispersion liquid, a preparation of positively charged porous graphene dispersion liquid, an assembly preparation of three-dimensional porous graphene ultrathin film and a preparation of three-dimensional porous graphene ultrathin film based vertical responding gas sensor. The gas sensitive sensor with porous graphene ultrathin film that prepared through the preparation method has a very high sensitivity to DMMP gas molecule. And the preparation method is simple in technology and suitable for large-scale preparation of the sensors.

Description

technical field [0001] The invention belongs to the technical field of sensors, and relates to a nano sensor and a preparation method thereof, in particular to a vertical response gas sensor based on a three-dimensional porous graphene ultra-thin film and a preparation method thereof. Background technique [0002] Gas sensors play an increasingly important role in environmental monitoring, food safety, medical and health and other fields. With the development of nanotechnology, metal oxide semiconductor nanoparticles, carbon nanomaterials, and two-dimensional nanofilms have been used as sensitive materials to form gas sensors, which have better detection performance than traditional sensors. Among them, graphene has attracted widespread attention since its discovery in 2004. Due to its unique two-dimensional honeycomb structure, graphene has many irreplaceable advantages of conventional sensor materials, so it has broad development prospects as a sensing material in biology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 王艳艳彭长四陈林森
Owner 砥创(苏州)新材料科技有限公司
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