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A three-dimensional porous graphene ultra-thin film gas sensor and its preparation method

A gas sensor and porous graphene technology, applied in the field of sensors, can solve the problems of reduced contact area between graphene sheets and gas molecules, affecting the gas sensing performance of sensors, poor repeatability of sensors, etc., to achieve low-cost large-scale preparation, Achieve precise control and fast results

Active Publication Date: 2018-07-06
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

Considering the shortcomings of the sensor composed of a single graphene sheet, such as poor repeatability and low stability caused by the rupture of a single sheet, constructing a graphene sheet network has become one of the most effective methods for preparing high-efficiency graphene sensors.
However, in the process of constructing the graphene network, the contact area between graphene sheets and gas molecules is likely to be greatly reduced due to the layer stacking effect, thus affecting the gas sensing performance of the sensor.

Method used

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  • A three-dimensional porous graphene ultra-thin film gas sensor and its preparation method
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  • A three-dimensional porous graphene ultra-thin film gas sensor and its preparation method

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Embodiment 1

[0037] A preparation method of a three-dimensional porous graphene ultra-thin film gas sensor, comprising the following steps:

[0038] 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 5 wt%, and then add 1 mL of ferrous sulfate solution with a concentration of 20 mM, 80 Hz ultrasonic dispersion for 30 min to form a graphene oxide dispersion, and then add hydrochloric acid to make the pH value reach 4;

[0039] 2. Place the above graphene oxide dispersion under a 2000 W UV lamp for reaction etching for 30 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;

[0040] 3. Take 100 mL of negatively cha...

Embodiment 2

[0046] A preparation method of a three-dimensional porous graphene ultra-thin film gas sensor, comprising the following steps:

[0047] 1. After ultrasonic dispersion of 2 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 5wt%, and then add 1 mL of ferrous sulfate solution with a concentration of 20 mM, and 80 Hz ultrasonic Disperse for 30 min to form a graphene oxide dispersion, then add hydrochloric acid to make the pH value reach 4;

[0048] 2. Place the above-mentioned graphene oxide dispersion under a 2000 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 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;

[0049] 3. Add 1000 mg of p-phenyle...

Embodiment 3

[0053] A preparation method of a three-dimensional porous graphene ultra-thin film gas sensor, comprising the following steps:

[0054] 1. After ultrasonic dispersion of 1 mg / mL graphene oxide aqueous solution obtained by Hummers method in 200 mL for 5 hours, add 80 mL of hydrogen peroxide solution with a concentration of 5wt%, and then add 1 mL of ferrous sulfate solution with a concentration of 20 mM, and ultrasonicate at 80 Hz Disperse for 30 min to form a graphene oxide dispersion, then add hydrochloric acid to make the pH value reach 4;

[0055] 2. Place the above graphene oxide dispersion under a 3000 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 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;

[0056] 3. Add 1000 mg of p-phenylen...

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Abstract

The invention discloses a three-dimensional porous graphene ultrathin membrane and a preparation method thereof. The three-dimensional porous graphene ultrathin membrane is prepared through the preparation of an electronegative porous graphene dispersion liquid and the preparation of an electropositive porous graphene dispersion liquid. An obtained gas sensor prepared by the porous graphene ultrathin membrane has very high sensitivity for DMMP gas molecules. The preparation method has a simple technology, and is suitable for the large-scale preparation of sensors.

Description

technical field [0001] The invention belongs to the technical field of sensors, and relates to a nanometer sensor and a preparation method thereof, in particular to a three-dimensional porous graphene ultra-thin film gas sensor 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, chemistry, machinery, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00C01B32/184
CPCC01B32/184G01N33/0047G01N33/0054
Inventor 王艳艳彭长四陈林森宋加加
Owner 砥创(苏州)新材料科技有限公司
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