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Differential type flexible piezoresistive device based on conductive polymer composite

A technology of conductive polymers and composite materials, applied in the field of measurement, can solve problems such as inability to improve sensitivity

Inactive Publication Date: 2014-05-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the engineering application of interlayer pressure measurement on narrow curved surfaces, due to the limitation of the interlayer structure of the curved surface, it is impossible to use the traditional method to realize the differential structure to improve the sensitivity

Method used

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  • Differential type flexible piezoresistive device based on conductive polymer composite
  • Differential type flexible piezoresistive device based on conductive polymer composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Lay the lower electrode of the incremental piezoresistive unit and the lower electrode of the progressive piezoresistive unit on the polyimide film as the bottom packaging film; The areas are 24 square millimeters and 8 square millimeters respectively; the bottom packaging film is fixed on the rotating platform for later use; the conductive carbon black powder (specific surface area is 780 square meters per gram) and room temperature vulcanized silicone rubber are mixed according to the ratio of 0.08:1. The mass ratio is mixed to form a carbon black-filled silicone rubber composite gel-like viscous material with increasing piezoresistive properties, and it is dropped into the lower electrode of the incremental piezoresistive unit of the bottom packaging film fixed on the rotating platform On the surface, an incremental piezoresistive effect film with a thickness of 0.08 mm was formed by spin coating, and formed after vulcanization for 60 hours; the incremental piezoresis...

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Abstract

The invention relates to a differential type flexible piezoresistive device based on a conductive polymer composite, which belongs to the technical field of measurement. The piezoresistive device comprises two piezoresistive units based on the conductive polymer composite, an increasing type piezoresistive unit and a decreasing type piezoresistive unit; the conductive polymer composite is prepared by a solution mixing method; the conductive phase content of the increasing type piezoresistive unit is higher than the critical content of the composite, and the resistance thereof is increased with the increasing of a pressure; the conductive phase content of the decreasing type piezoresistive unit is lower than the critical content of the composite, and the resistance thereof is reduced with the increasing of a pressure; the absolute values of the resistance changes of the increasing type piezoresistive unit and the decreasing type piezoresistive unit are equal under the same pressure by designing the electrode areas thereof, so as to form a differential structure. The piezoresistive device developed by the method disclosed by the invention has the advantages of being high in sensitivity, high in flexibly, low in cost and the like, as well as is especially suitable for a narrow curved-surface interlayer small-pressure measurement for industrial equipment.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a soft sensor preparation process. Background technique [0002] With the rapid development of modern industry, there are curved interlayer structures in many large-scale equipment, and the measurement of interlayer pressure is the key to ensure the safe operation of the system. However, the installation of traditional rigid sensors is difficult due to the narrow interlayer gap and irregular contact surfaces. Conductive polymer composite material is a new type of functional material. It is not only flexible, but also its resistance changes regularly under the action of pressure. Therefore, this composite material can be used as a sensitive material for flexible pressure sensors and applied to curved surface layers. pressure measurement. However, the resistance of this material has a small change under small pressure. Therefore, the flexible pressure sensor based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18
Inventor 王璐珩
Owner NORTHEASTERN UNIV
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