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Graphene film humidity sensor

A humidity sensor, graphene film technology, applied in the direction of material resistance, can solve the problems of film formation and agglomeration, affecting the uniformity and quality of the film, and achieve the effects of fast response, low cost and strong adsorption.

Inactive Publication Date: 2013-06-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the assembly and preparation of graphene thin films has become a bottleneck restricting the development of its devices. The preparation of thin films by solution blending is a widely used method, but it is prone to film formation and agglomeration, which affects the uniformity and quality of the film.

Method used

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Embodiment Construction

[0022] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0023] see figure 1 , the embodiment of the present invention is provided with flexible polymer substrate 5, comb-shaped interdigitated electrode 6, graphene-based moisture-sensitive film 4, resistance pick-up circuit board 9, electrode pin 7, air-permeable housing 2 and 12, lead hole 11, Fixed screw hole 8, fixed screw rod 3 and nut 13.

[0024] A flexible polymer substrate made of polyimide, on which a comb-like interdigitated electrode pattern is prepared by photolithography and evaporation. Electrostatically induced self-assembly method is used to prepare polyelectrolyte film layer on the surface of flexible polymer substrate and comb-shaped interdigitated electrode as a leading layer, and then solvent evaporation-induced self-assembly method is used to prepare graphene film to form a humidity-sensitive film sensor element, such as figure 2 As ...

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Abstract

The invention relates to a humidity sensor based on nano material film. The humidity sensor comprises a flexible polymer substrate, a comb-like interdigital electrode, a graphene based humidity sensitive film, a humidity sensitive film resistor pickup circuit board, a circuit signal line and an air hole casing. The graphene based humidity sensitive film is a multilayer network film composed of a static induced self-assembly polyelectrolyte precursor and a solvent evaporation induced self-assembly graphene film, and prepared on surfaces of the flexible polymer substrate and the comb-like interdigital electrode to form a humidity sensitive film sensing element. The film resistor pickup circuit and the humidity sensitive element are electrically connected together through a contact pin mode; the humidity sensitive element and the signal pickup circuit board are fixed through screws and nuts, and arranged in air hole plastic casing; and the circuit signal line is lead out through a casing lead hole to realize functions of data acquisition, storage, display and alarm. The sensor has the characteristics of stability, reliability, low cost, high sensitivity, good repeatability, and high speed of humidity sensitive response and recovery, etc.

Description

technical field [0001] The invention relates to a nano-material film sensor and a preparation method thereof, in particular to a graphene-based film humidity sensor. Background technique [0002] Humidity sensor has an important influence and wide application background in the field of sensors. It not only directly affects the basic living conditions of human beings, but also has a great impact on industry and agriculture, biological products, medicine and health, and national defense construction. The development of humidity sensor occupies an important position in the sensor industry. The humidity sensor based on the humidity sensor is a device that detects the humidity of the external environment. It converts the detected humidity signal into a signal that is easy to process, transmit, display, and record. At present, humidity sensors mainly include electrolyte type, semiconductor ceramic type, and polymer type. Electrolyte type humidity sensors are simple in principle an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 张冬至夏伯锴童俊王凯张吉祥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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