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A compressible composite carbon aerogel with high sensitivity and wide linear sensing range and its preparation and application

A composite aerogel, sensing range technology, applied in the field of compressible composite carbon aerogel and its preparation, can solve the problems of difficult structural design, difficult industrial application, poor mechanical properties, etc., and achieves excellent cycle stability and wide range. Application, effect of wide sensing range

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of structural design, the large shrinkage during carbonization and the brittleness of its derived carbon, single biomass raw materials often have poor mechanical properties and are difficult to apply industrially.

Method used

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  • A compressible composite carbon aerogel with high sensitivity and wide linear sensing range and its preparation and application
  • A compressible composite carbon aerogel with high sensitivity and wide linear sensing range and its preparation and application
  • A compressible composite carbon aerogel with high sensitivity and wide linear sensing range and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) MXene (Ti 3 C 2 ) is placed in water for ultrasonic dispersion to obtain 50ml concentration of MXene suspension of 1mg / mL;

[0043] (2) Add 0.05g FeCl 3 ·6H 2O and 500 μl of glacial acetic acid were dissolved in the above-mentioned MXene suspension to obtain an acidic MXene suspension;

[0044] (3) Under high-speed stirring (500r / min), slowly add 0.25g chitosan to the suspension, stir at high speed until dissolved, and ultrasonically for 20 minutes (above 300 Hz), to obtain MXene / chitosan suspension;

[0045] (4) Freeze the MXene / chitosan suspension with liquid nitrogen (-196°C, until it is completely frozen into ice, generally takes about 20min), and then freeze-dry the solution after it is completely frozen (-58°C, 0.22mbar, Until completely dry), the composite airgel is obtained;

[0046] (5) The obtained composite airgel was placed in a tube furnace, and the temperature was raised to 800° C. at a rate of 3° C. / min in an argon atmosphere and kept for 2 hours...

Embodiment 2

[0050] (1) MXene is placed in water for ultrasonic dispersion, and then 50ml of MXene suspension with a concentration of 3mg / mL is obtained;

[0051] (2) 0.03g FeCl 3 ·6H 2 O and 300 μl of glacial acetic acid (anhydrous acetic acid) were dissolved in the above-mentioned MXene suspension to obtain an acidic MXene suspension;

[0052] (3) under high-speed stirring, slowly add 0.15g chitosan in the suspension obtained above, stir at high speed until dissolving, ultrasonic 20 minutes, obtain MXene / chitosan suspension;

[0053] (4) Freeze the above-mentioned MXene / chitosan suspension with liquid nitrogen, and freeze-dry (-58°C, 0.22mbar, until completely dry) after the solution is completely frozen to obtain a composite airgel;

[0054] (5) The obtained composite airgel was placed in a tube furnace, and the temperature was raised to 800° C. at a rate of 3° C. / min in an argon atmosphere and kept for 2 hours to obtain an elastic carbon aerogel.

[0055] The stress-strain curves of...

Embodiment 3

[0057] (1) MXene is placed in water for ultrasonic dispersion to obtain 50ml of MXene suspension with a concentration of 5mg / mL;

[0058] (2) Add 0.05g FeCl 3 ·6H 2 O and 500 μl of glacial acetic acid were dissolved in the above-mentioned MXene suspension to obtain an acidic MXene suspension;

[0059] (3) under high-speed stirring, slowly add 0.25g chitosan to the suspension obtained above, stir at high speed until dissolving, ultrasonic 20 minutes, obtain MXene / chitosan suspension;

[0060] (4) Freeze the above-mentioned MXene / chitosan with liquid nitrogen, and freeze-dry (-58°C, 0.22mbar, until completely dry) after the solution is completely frozen to obtain a composite airgel;

[0061] (5) The obtained composite airgel was placed in a tube furnace, and the temperature was raised to 800° C. at a rate of 3° C. / min in an argon atmosphere and kept for 2 hours to obtain an elastic carbon aerogel.

[0062] The stress-strain curves of the elastic carbon aerogel prepared in thi...

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Abstract

The invention belongs to the field of elastic carbon materials, and discloses compressible composite carbon aerogel with high sensitivity and a wide linear sensing range as well as preparation and application of same. The method comprises the following steps: 1) dispersing MXene nanosheets in water to obtain an MXene suspension liquid; 2) uniformly mixing a water-soluble trivalent iron salt, an acid, the MXene suspension liquid and chitosan, freezing and drying the mixture to obtain a composite aerogel; 3) carrying out heat treatment on the composite aerogel in an inert atmosphere to obtain the composite carbon aerogel, the heat treatment refers to heating the components to 500-1200 DEG C and carrying out heat preservation for 0-12 hours. The method is simple and environment-friendly. Theprepared carbon aerogel has the advantages of high compressibility, high rebound resilience, excellent cycling stability, ultrahigh sensitivity and wide-range linear sensing, and is applied to a sensing device.

Description

technical field [0001] The invention belongs to the field of elastic carbon materials, and in particular relates to a compressible composite carbon airgel with high sensitivity and wide linear sensing range, a preparation method and application thereof. Background technique [0002] Compressible elastic carbon aerogels can be assembled into piezoresistive sensors for applications in human-computer interaction, biomedical monitoring, and motion detection due to their ability to convert external pressure or strain into electrical current signals during compression. Traditional compressible carbon materials are mostly constructed of nano-carbon materials such as carbon nanotubes, graphene and its derivatives, and nano-carbon composite materials. However, these nano-carbon materials are mostly derived from non-renewable petrochemical resources, which face problems such as environmental pollution and unsustainability, and the preparation methods are complicated and costly. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00C04B38/06C04B111/40C04B111/50C04B111/94
Inventor 钟林新胡艺洁卓浩彭新文罗青松易基旺
Owner SOUTH CHINA UNIV OF TECH