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Graphene-based conductive hydrogel and its preparation method and its application in flexible wearable sensors

A conductive hydrogel, graphene-based technology, applied in sensors, applications, diagnostic recording/measurement, etc., can solve problems such as high cost, limited application potential of wearable devices, complexity, etc., to reduce complexity and achieve good self-healing The effect of combining performance and reducing measurement error

Active Publication Date: 2022-07-26
CHONGQING MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing preparation methods and technologies for flexible wearable sensors generally adopt complex vacuum micro-manufacturing technology. This high-cost preparation method greatly limits the application potential of wearable devices.

Method used

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  • Graphene-based conductive hydrogel and its preparation method and its application in flexible wearable sensors
  • Graphene-based conductive hydrogel and its preparation method and its application in flexible wearable sensors
  • Graphene-based conductive hydrogel and its preparation method and its application in flexible wearable sensors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of graphene-based hydrogel

[0030] To prepare graphene-based hydrogels, follow these steps:

[0031] (1) 30mg graphene oxide is dispersed in the deionized water of 10ml, after ultrasonic dispersion 40min, form homogeneous graphene oxide suspension, the dopamine hydrochloride of 15mg is added in this suspension, adjust pH to 11 with 1Mmol NaOH solution , continue stirring at 70 °C for 2 h, the graphene oxide in the solution is partially reduced to reduced graphene oxide, and a mixed solution of reduced graphene oxide conductive nano-fillers is obtained, figure 1The peak-splitting results of the Fourier transform spectrum can show that the content of oxygen-containing functional groups in graphene oxide is reduced, and graphene oxide is partially reduced to reduced graphene oxide.

[0032] (2) Dissolve 0.25g of sodium alginate with 10ml of deionized water. When dissolving sodium alginate, it is necessary to pre-soak sodium alginate for 8 hours, and...

Embodiment 2

[0034] To prepare graphene-based hydrogels, follow these steps:

[0035] (1) 10mg graphene oxide is dispersed in the deionized water of 10ml, after ultrasonic dispersion 40min, form homogeneous graphene oxide suspension, the dopamine hydrochloride of 5mg is added in this suspension, adjust pH with the NaOH solution of 1Mmol to 9. Continuously stirring at 60° C. for 1 h, the graphene oxide in the solution is partially reduced to reduced graphene oxide to obtain a mixed liquid of reduced graphene oxide conductive nano-filler.

[0036] (2) Dissolve 0.1 g of sodium alginate in 10 ml of deionized water, add 1.0 g of acrylamide monomer to the solution and mix to obtain a flexible base solution, add the reduced graphene oxide in step (1) to the flexible base solution to conduct electricity The nano-filler mixed solution was fully and vigorously stirred (50° C. at 700 rpm for 5 hours), and then allowed to stand for 2 hours in a vacuum drying oven. Take out, under ice bath conditions,...

Embodiment 3

[0038] To prepare graphene-based hydrogels, follow these steps:

[0039] (1) 50mg graphene oxide is dispersed in the deionized water of 10ml, after ultrasonic dispersion 40min, form homogeneous graphene oxide suspension, the dopamine hydrochloride of 25mg is added in this suspension, adjust pH to 12, at 80 ℃ Stirring is continued for 6 h, and the graphene oxide in the solution is partially reduced to reduced graphene oxide to obtain a mixed liquid of reduced graphene oxide conductive nano-filler.

[0040] (2) Dissolve 0.4 g of sodium alginate with 10 ml of deionized water, add 3 g of acrylamide monomer to the solution and mix to obtain a flexible base solution, add the reduced graphene oxide conductive nanometer in step (1) to the flexible base solution The filler mixed solution was fully and vigorously stirred (stirring at 1000 rpm for 6 hours at 70° C.), and then allowed to stand for 8 hours in a vacuum drying oven. Take out, under ice bath condition, add 0.06g ammonium per...

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Abstract

The invention discloses a graphene-based conductive hydrogel. Polydopamine is used to partially reduce graphene oxide to obtain conductive nano-filler, acrylamide and sodium alginate are mixed to prepare a flexible base liquid, and the conductive nano-filler and the flexible base liquid are mixed. Mixed, prepared by free radical polymerization. The preparation method is also disclosed: 1. Disperse graphene oxide powder uniformly in an aqueous solution, add dopamine monomer, adjust pH, and stir to obtain a conductive nano-filler mixed solution; 2. Add acrylamide monomer to sodium alginate solution Mixing to obtain a flexible base solution, adding conductive nano-filler mixed solution, stirring, standing in a vacuum drying box, taking out, under ice bath, adding initiator, cross-linking agent, auxiliary agent, and stirring to obtain graphene-based conductive hydrogel. The application of the graphene-based conductive hydrogel in the preparation of flexible wearable sensors is also disclosed. The hydrogel of the present invention has excellent electrical and mechanical properties, self-healing, self-adhesion and biocompatibility.

Description

technical field [0001] The invention belongs to the technical field of biological materials, and in particular relates to a graphene-based conductive hydrogel, a preparation method thereof, and an application in a flexible wearable sensor. Background technique [0002] Driven by innovative technologies such as new sensing technology, mobile Internet technology, big data analysis technology, and low-power chip technology, wearable devices have received more and more attention and favor. According to Memes Consulting, the global wearable medical device market size was US$5.31 billion in 2016 and is expected to reach US$12.14 billion in 2021, with a compound annual growth rate of 18.0% from 2016 to 2021. Wearable devices play an increasingly important role in sports fitness, health management, social entertainment, and military fields. Flexible sensors have attracted much attention for their unique applications in wearable electronics, soft robotics, and artificial intelligenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08F251/00C08F220/56C08F222/38C08K9/04C08K3/04A61B5/11A61B5/113A61B5/00
CPCC08J3/075C08F251/00C08K9/04C08K9/08C08K3/042A61B5/11A61B5/1135A61B5/6801C08K2201/011C08F220/56C08F222/385
Inventor 熊兴良章艳江奇锋李扬张铃钦查小英
Owner CHONGQING MEDICAL UNIVERSITY
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