Recently, Fei Guangtao, a researcher at the Institute of Solid State Physics at the Chinese Academy of Sciences' Hefei Institute of Physical Science, made new progress in the preparation of flexible strain sensors and the study of force sensitivity characteristics. The relevant research results are based on Flexible strain sensor with high performance based on PANI/PDMS. Films are published in the magazine Organic Electronics (47 (2017) 51-56).
With the rapid development of science and technology, sensors have been widely used in fields such as biomedical detection, intelligent robots, flexible displays, wearable devices, etc. These fields often require the sensor to have a bendable and stretchable characteristic, which can satisfy the attachment. Demand on various irregular surfaces. In addition, a good strain sensor should also have high sensitivity (GF) and low resistance values. GF too low means that the sensor is prone to signal errors due to the small amount of change when detecting strain, and too large a resistance value means that a high-precision and expensive test instrument is required.
Currently, there are two types of sensitive sensors for flexible strain sensors: one is a sensor made of conductive materials such as silver, carbon tubes, and graphene. The sensors have low resistance, and GF is also low; One is a sensor using a semiconductor material as a strain-sensitive material. This type of sensor has a high GF, but its resistance is also high. Both types of sensors are subject to certain restrictions in commercial applications. Therefore, designing a flexible sensor with low resistance and high GF is imminent.
Polyaniline (PANI) is a conductive polymer material. The conductivity after doping with protonic acid is between the metal and the semiconductor, and can change with the acid doping concentration. Therefore, the polyaniline and the elastic material polydimethyl PDMS bonding is expected to achieve low resistance and high GF requirements. Based on this, the research group Dr. Gong Xinxin and associate researcher Fang Ming used PANI as the conductive layer, PDMS as the elastic layer to prepare the PANI/PDMS composite film flexible strain sensor, and studied the performance of the sensor. The experimental results show that the PANI/PDMS composite film sensor has a certain degree of flexibility (Figure 1) and can be stretched to 50% of the strain, and the GF value can reach a maximum of 54, which is much higher than the flexible strain sensors constructed by other materials, and has excellent The cyclic stability (Figure 2) has potential application prospects in monitoring human activity (Figure 3).
The above work has been funded by the National Major Scientific Research Project and several National Natural Science Foundation projects.
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