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Flexible temperature sensor and preparation method thereof

A temperature sensor, flexible technology, applied in thermometers, thermometer applications, instruments, etc., can solve the problems of weakening the agglomeration effect, increasing the distance between graphene sheets by electrostatic repulsion, reducing the van der Waals force between graphene particles, etc., so as to weaken the agglomeration effect Effect

Inactive Publication Date: 2019-11-08
CENT SOUTH UNIV
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Problems solved by technology

[0005] The invention provides a flexible temperature sensor and a preparation method thereof. Before the graphene is incorporated into PDMS, the graphene is ultrasonically dispersed to reduce the van der Waals force between the graphene particles and increase the static electricity between the particle surfaces. The repulsive force increases the distance between graphene sheets, thereby weakening the agglomeration effect, thereby solving the problem that graphene cannot form a cross-linked network with PDMS, which blocks the conductive path, causing the flexible temperature sensor to be unable to quickly sense the ambient temperature change, and the sensitivity poor technical issues

Method used

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  • Flexible temperature sensor and preparation method thereof

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preparation example Construction

[0050] Based on the above experiments, the present invention discloses a method for preparing a flexible temperature sensor, comprising the following steps:

[0051] The graphene sample is subjected to ultrasonic dispersion treatment to obtain a prepared graphene dispersion;

[0052] Adding a PDMS matrix to the prepared graphene dispersion to obtain a graphene-PDMS composite dispersion;

[0053] removing the dispersant in the graphene-PDMS composite dispersion solution to obtain the graphene-PDMS composite solution;

[0054] Adding a PDMS curing agent to the graphene-PDMS composite solution to obtain a graphene-PDMS curing solution;

[0055] The graphene-PDMS solidified solution is subjected to degassing treatment, and the graphene-PDMS solidified solution after degassing treatment is injected into the mould;

[0056] The graphene-PDMS curing solution injected into the mold is heated and cured to obtain the prepared flexible temperature sensor.

[0057] In the preparation m...

Embodiment 1

[0059] Such as image 3 Shown, in the present embodiment, adopt isopropanol as dispersant, and adopt low-power ultrasonic dispersion, specifically comprise the following steps:

[0060] (1) according to proportioning calculation required graphene: the mass ratio (curing agent: matrix=1:10) content of PDMS matrix;

[0061] (2) Weigh a quantitative graphene sample, pour it into isopropanol solvent according to the mass ratio of 1:60, and mix to obtain a graphene dispersion: isopropanol is slightly toxic and volatile, and the experimental operation is completed in a fume hood. Since graphene monomer is easy to entangle, adding isopropanol can make graphene disperse evenly, which is conducive to the formation of cross-linked network;

[0062] (3) Low-power ultrasonic dispersion: Ultrasound is used to disperse graphene more uniformly in isopropanol solution. Put the graphene dispersion into the Figure 4 In the ultrasonic cleaning machine shown (power 180W), since heat will be g...

Embodiment 2

[0072] Embodiment two is the extended embodiment of embodiment one, and its difference with embodiment one is, in the present embodiment, what use is that nitrogen methyl pyrrolidone (NMP) solvent replaces isopropanol solution as the dispersion of graphene Because the boiling point of isopropanol is 82.45 DEG C, it can be volatilized under the situation of water bath 80 DEG C, and the boiling point of nitrogen methyl pyrrolidone (NMP) is 203 DEG C, cannot volatilize under water bath condition, therefore, in the dispersant volatilization step , using as Figure 5 The volatilization process of the dispersant shown is volatilization, specifically:

[0073] During the volatilization process of the dispersant, the sample is placed on a constant temperature heating platform, and an asbestos net is placed on it (to ensure that the sample is heated evenly), and the temperature of the heating platform is adjusted to 230°C (there is a temperature loss during the heating process), and "a...

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Abstract

The invention discloses a flexible temperature sensor and a preparation method thereof. Before graphene is mixed with PDMS, van der Waals force among graphene particles is reduced through ultrasonic dispersion treatment of the graphene, and electrostatic repulsion force between particle surfaces is increased to increase the distance between graphene sheets, thereby weakening agglomeration effect,thereby solving the technical problems that the graphene cannot form a cross-linking network with the PDMS, conductive paths are blocked, and the flexible temperature sensor cannot quickly sense environmental temperature changes and has poor sensitivity.

Description

technical field [0001] The invention relates to the technical field of temperature sensor production, in particular to a flexible temperature sensor and a preparation method thereof. Background technique [0002] Flexible temperature sensors are more and more widely used in daily life, medical and health fields, such as the detection of health indicators and the prevention of postoperative complications. Graphene has been widely used in the research of flexible sensor materials because of its excellent mechanical properties, thermal properties and ultra-high electron mobility. In the prior art, when using graphene to prepare flexible sensors, it is usually selected to incorporate graphene into the elastomer matrix, which combines the excellent characteristics of graphene with the flexibility and ductility of the elastomer matrix. High-sensitivity temperature sensors are prepared on the Internet, such as the invention patent with the patent publication number CN109916527A, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/04G01K13/00
CPCC08K3/042G01K13/20C08L83/04
Inventor 何虎郭登机余胜宏朱文辉
Owner CENT SOUTH UNIV
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