Abstract
Flexible pressure sensors are attracting great interest from researchers and are widely applied in various new electronic equipment because of their distinct characteristics with high flexibility, high sensitivity, and light weight; examples include electronic skin (E-skin) and wearable flexible sensing devices. This review summarizes the research progress of flexible pressure sensors, including three kinds of transduction mechanisms and their respective research developments, and applications in the fields of E-skin and wearable devices. Furthermore, the challenges and development trends of E-skin and wearable flexible sensors are also briefly discussed. Challenges of developing high extensibility, high sensitivity, and flexible multi-function equipment still exist at present. Exploring new sensing mechanisms, seeking new functional materials, and developing novel integration technology of flexible devices will be the key directions in the sensors field in future.
Highlights
Nowadays, there is rapid development of high-performance smart materials, as well as intelligent home and internet of things (IoT) technology; sensors technology has gradually stepped into people’s lives and attracted widespread interest from researchers, especially in flexible pressure sensors
electronic skin (E-skin) can be attached to the surface of a human body or a robot as a garment, and can be processed into various shapes to imitate the sensory function of human skin because of its features of light and softness, and to achieve intelligence for robots and physiological status detection
We highlight the progress of flexible pressure sensors and their applications in E-skin and wearable flexible devices
Summary
There is rapid development of high-performance smart materials, as well as intelligent home and internet of things (IoT) technology; sensors technology has gradually stepped into people’s lives and attracted widespread interest from researchers, especially in flexible pressure sensors. Tactile-sensing simulation of the human skin characteristics with high sensitivity, high resolution ratio, and fast response to temperature and pressure is a highly interesting but difficult challenge for applications in health care monitoring and robotic artificial intelligence [6]. Doshi and Thostenson [29] fabricated a textile pressure sensor based on carbon nanotubes (CNTs) using fiber/fiber contact and the formation of a sponge-like piezoresistive nanocomposite between fibers that caused changes in electrical conductivity. Such piezoresistive sensors are highly sensitive to touching, and have a high electrical stability
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