In recent years, the flexible pressure sensor has been paid more and more attention in the field of production, learning and research because of its wide application in human-computer interaction, electronic skin, intelligent wearable and other fields. However, when the traditional flexible sensor is used in the real flexible substrate scene, the vertical stress along the normal direction caused by the bending of the device will produce "pseudo signal", so how to ensure the reliability and stability of the final device performance is still a very urgent need. In addition, the realization of a wider dynamic linear range is usually at the expense of the sensitivity of the device, and vice versa. How to solve the balance between the sensitivity of the device and the range of dynamic linear range through the design of the structure and the selection of the materials is still a big challenge. In order to solve the above problems, Chen Ming, associate researcher of photon information and energy materials research center, Institute of materials, Shenzhen Institute of advanced technology, Chinese Academy of Sciences, Yang Chunlei and his collaborators proposed two solutions:
Using traditional micro nano processing technology, vacuum coating technology and laser scribing technology, the flexible pressure sensor with PDMS / AZO, PS as the top structure, PI / Au as the bottom interdigital electrode was prepared. The device has a sensitivity of up to 2200 kpa-1, a dynamic linear range of up to 9.6 kPa, and a rise and fall response time of less than 20 ms. In addition, the working mechanism and internal pressure distribution of the device under the action of external pressure are explained theoretically, and the relationship between the hole diameter in the PS interlayer, the microstructure of the conductive layer and the final device sensitivity, dynamic linear range and sensitivity threshold are explained. Recently, the above research results were published on the famous energy journal nano energy (DOI: 10.1016/j.nanoen.2020.104743, if = 15.548) under the title of "high performance zero standby power consumption under bending pressure sensors for artistic reference arc".
Figure 1 finite element analysis based on flexible pressure sensor
Figure 2 conceptual schematic diagram of human body and artificial reflection arc, and application diagram of artificial Reflection Arc in real scene
In addition, the researchers also designed a flexible pressure sensor based on PDMS / CB, patterned PI interlayer and laser-induced graphene (lig) interdigital electrode with high performance and zero standby power loss. The flexible pressure sensor has high sensitivity (43 kpa-1), wide linear response range (0.4-13.6 kPa), fast response (& lt; 30 ms), long-term cycle stability (& gt; 1800 cycles) and standby zero power loss under some bending conditions (bending angle: 0-5 °). In addition, the influence of the pore diameter of PI interlayer on the performance of flexible pressure sensor is studied experimentally and theoretically. Relevant research results were also published in ACS Applied Materials & interfaces (DOI: 10.1021 / acsami.0c02774, if = 8.456) on the topic of "highly sensitive and wide linear response pressure sensors feeding zero standby power consumption under benefiting conditions". The above work was jointly completed by He Ke, Yi Chenghan and Hou Yuxin.
The above research is supported by NSFC and Shenzhen basic research layout project.
Paper link:
http://www.sciencedirect.com/science/article/pii/S2211285520303001
https://pubs.acs.org/doi/10.1021/acsami.0c02774
Source: Shenzhen Advanced Institute of Chinese Academy of Sciences
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