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Carbon aerogel with ultra-high linear sensitivity and preparation and application thereof in sensor

A carbon aerogel and sensitivity technology, applied in the field of carbon aerogel and its preparation, can solve the problems of large recognition stress and difficulty in realizing sensitive sensing, and achieve ultra-high sensitivity, excellent cycle stability, and wide application Effect

Active Publication Date: 2018-12-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since graphene and carbon nanotubes are easy to form defects during the preparation process, the material has a strong dependence on high-quality graphene or carbon nanotubes, and the pressure sensors prepared by the above method mostly use flexible substrates, which can identify the stress. Large, difficult to achieve sensitive sensing under small stress

Method used

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  • Carbon aerogel with ultra-high linear sensitivity and preparation and application thereof in sensor
  • Carbon aerogel with ultra-high linear sensitivity and preparation and application thereof in sensor
  • Carbon aerogel with ultra-high linear sensitivity and preparation and application thereof in sensor

Examples

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Effect test

Embodiment 1

[0035] (1) MXene (Ti 3 C 2 ) material was added into ultrapure water or deionized water, and then ultrasonic stripped and dispersed for 2 hours to obtain a 0.05wt% MXene suspension;

[0036] (2) adding nano-microcrystalline cellulose equivalent to 3 times the quality of MXene into the MXene suspension obtained in step (1), ultrasonically again for 0.5 hour, to obtain MXene / nano-crystalline cellulose suspension;

[0037] (3) Put the above-mentioned MXene / nanocrystalline cellulose suspension in a plastic box, tie the box to the outer wall of the metal box, pour liquid nitrogen into the metal box for freezing (you can freeze it, 15 minutes), and wait for the solution Freeze-drying (-52°C, 24h) after complete freezing to prepare MXene / nanocrystalline cellulose composite airgel;

[0038] (4) The composite airgel was placed in a tube furnace, and the temperature was raised to 600°C at a rate of 3°C / min in a nitrogen atmosphere and kept for 4 hours to obtain an elastic carbon aerog...

Embodiment 2

[0042] (1) MXene (Ti 3 C 2 ) into ultrapure water or deionized water, and then ultrasonic stripping and dispersion for 1 hour to obtain a MXene suspension with a concentration of 0.1wt%;

[0043] (2) adding nano-microcrystalline cellulose equivalent to 5 times of MXene quality into step (1) gained MXene suspension, ultrasonication for 1 hour again, to obtain MXene / nano-microcrystalline cellulose suspension;

[0044] (3) Put the above-mentioned MXene / nanocrystalline cellulose suspension in a plastic box, tie the box to the outer wall of the metal box, pour liquid nitrogen into the metal box for freezing (you can freeze it, 15 minutes), and wait for the solution Freeze-drying (-52°C, 24h) after complete freezing to prepare MXene / nanocrystalline cellulose composite airgel;

[0045] (4) The obtained composite airgel was placed in a tube furnace, and the temperature was raised to 700° C. at a rate of 5° C. / min in a nitrogen atmosphere and kept for 2 hours to obtain an elastic car...

Embodiment 3

[0050] (1) MXene (Ti 3 C 2 ) into ultrapure water or deionized water, and then ultrasonic stripping and dispersion for 4 hours to obtain a MXene suspension with a concentration of 1 wt %;

[0051] (2) adding nano-microcrystalline cellulose equivalent to 4 times of MXene quality into step (1) gained MXene suspension, ultrasonic again for 3 hours, to obtain MXene / nano-microcrystalline cellulose suspension;

[0052] (3) Put the above-mentioned MXene / nanocrystalline cellulose suspension in a plastic box, tie the box to the outer wall of the metal box, pour liquid nitrogen into the metal box for freezing (you can freeze it, 15 minutes), and wait for the solution Freeze-drying (-52°C, 24h) after complete freezing to prepare MXene / nanocrystalline cellulose composite airgel;

[0053] (4) The obtained composite airgel was placed in a tube furnace, and the temperature was raised to 700° C. at a rate of 5° C. / min in a nitrogen atmosphere and kept for 2 hours to obtain an elastic carbon...

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Abstract

The invention belongs to the technical field of flexible carbon materials, and discloses a carbon aerogel with ultra-high linear sensitivity and preparation and application of the carbon aerogel in asensor. The method comprises the following steps: (1) ultrasonically exfoliating and dispersing MXene materials in water to obtain MXene suspension; (2) adding nano-microcrystalline cellulose to the suspension, and performing ultrasonic treatment, liquid nitrogen refrigeration, and freeze-drying to obtain a composite aerogel; carbonizing the composite aerogel in inert atmosphere to obtain the elastic carbon aerogel. According to the invention, the advantages of MXene and the nano-microcrystalline cellulose are combined, the dispersion, support and connection of the nano-microcrystalline cellulose for MXene are utilized, the strengthening effect of an MXene sheet layer on the aerogel is combined and the refrigeration, freeze-drying and carbonization are performed to prepare the carbon aerogel with high compression, high resilience and excellent recycling use performances and the characteristics of ultra-high linear sensitivity and the like. The carbon aerogel disclosed by the inventionis applied to a sensing electronic device.

Description

technical field [0001] The invention belongs to the technical field of flexible carbon materials, and in particular relates to a carbon aerogel with ultra-high linear sensitivity, a preparation method thereof and an application in a sensor. Background technique [0002] The important role of flexible carbon materials in sensing devices depends on their compressive properties, elasticity, fatigue resistance, and sensitivity. The planar structure of two-dimensional nanomaterials has unique advantages in the design of ultra-thin electrodes, flexible materials, and lightweight matrix materials. As a new type of two-dimensional nanocarbon material, MXene has high electrical conductivity and certain flexibility, and can achieve large size in an ultra-thin case. Therefore, there is great promise in preparing flexible materials with excellent sensing properties. Traditional carbon-based flexible materials mostly use graphene and carbon nanotubes as substrates, such as graphene / car...

Claims

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Application Information

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IPC IPC(8): C01B32/05G01L1/00G01L9/00
CPCC01B32/05G01L1/00G01L9/00
Inventor 钟林新卓浩彭新文赖海宏刘麟翔易基旺罗青松
Owner SOUTH CHINA UNIV OF TECH
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