Monolayer MoS2-Based Flexible and Highly Sensitive Pressure Sensor with Wide Sensing Range

Abstract

Flexible pressure sensors play an important role in flexible robotics, human-machine interaction (HMI), and human physiological information. However, most of the reported flexible pressure sensors suffer from a highly nonlinear response and a significant decrease in sensitivity at high pressures. Herein, we propose a flexible novel iontronic pressure sensor based on monolayer molybdenum disulfide (MoS2). Based on the unique structure and the excellent mechanical properties as well as the large intercalation capacitance of MoS2, the prepared sensor holds an ultra-high sensitivity (Smax = 89.75 kPa−1) and a wide sensing range (722.2 kPa). Further, the response time and relaxation time of the flexible sensor are only 3 ms, respectively, indicating that the device can respond to external pressure rapidly. In addition, it shows long-term cycling stability (over 5000 cycles with almost no degradation) at a high pressure of 138.9 kPa. Finally, it is demonstrated that the sensor can be used in physiological information monitoring and flexible robotics. It is anticipated that our prepared sensor provide a reliable approach to advance the theory and practicality of the flexible sensor electronics.

3D Printed Electronic Skin for Strain, Pressure and Temperature Sensing

“…There have been few reported works utilizing MoS 2 for designing flexible sensors. [31][32][33] However, it is very important to highlight here that the majority of these reports are not bioelectronic sensors for mimicking human skin, both in terms of flexibility, mechanical property, and sensitivity. The reported works have utilized either monolayer MoS 2 deposited on Au electrode as a sensor, or polycrystalline MoS 2 thin film as the sensor, or as a coating material for polyurethane sponges to impart conductivity.…”

Flexible Microstructured Capacitive Pressure Sensors Using Laser Engraving and Graphitization from Natural Wood

“…Flexible pressure sensors are increasingly being paid more attention, because their flexibility, light weight, and stretching are crucial to a wide range of applications in surgical operation [ 1 , 2 , 3 , 4 ], moisture detection [ 5 , 6 , 7 , 8 , 9 , 10 ], human motion [ 11 , 12 , 13 , 14 ], and wearable devices [ 15 , 16 , 17 ], etc. According to various working mechanisms, flexible pressure sensors can be categorized by resistivity [ 10 , 18 , 19 ], capacitance [ 20 , 21 , 22 ], triboelectricity [ 23 ], and piezoelectricity [ 24 , 25 ]. Among them, capacitive flexible sensors have been studied extensively by researchers because of their simple structure, easy assembly, and wide range of applications [ 20 , 21 , 22 , 26 ].…”

“…According to various working mechanisms, flexible pressure sensors can be categorized by resistivity [ 10 , 18 , 19 ], capacitance [ 20 , 21 , 22 ], triboelectricity [ 23 ], and piezoelectricity [ 24 , 25 ]. Among them, capacitive flexible sensors have been studied extensively by researchers because of their simple structure, easy assembly, and wide range of applications [ 20 , 21 , 22 , 26 ]. A large number of microstructures comprising micropyramids, microdomes, semicylinders, porous structures, etc., have been applied for improving the sensitivity of capacitive pressure sensors [ 20 , 22 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”

“…Among them, capacitive flexible sensors have been studied extensively by researchers because of their simple structure, easy assembly, and wide range of applications [ 20 , 21 , 22 , 26 ]. A large number of microstructures comprising micropyramids, microdomes, semicylinders, porous structures, etc., have been applied for improving the sensitivity of capacitive pressure sensors [ 20 , 22 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. Since most microstructures are manufactured using processes such as photolithography, PVC, etc., their processes are complicated, expensive, and time-consuming [ 28 , 30 ].…”

Editorial for the Special Issue on Flexible and Wearable Sensors

“…In this Special Issue on Flexible and Wearable Sensors, we have included 25 papers, including 24 research papers, covering applications in human-computer interaction [ 1 , 2 , 3 ], mechanical design [ 4 , 5 , 6 , 7 , 8 ], health monitoring [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ], manufacturing technology [ 16 , 17 , 18 , 19 , 20 ], algorithms [ 21 , 22 , 23 ], and smart cities [ 24 ]. Additionally, we feature an intriguing review paper focusing on flexible wearable sensor devices for biomedical applications [ 25 ].…”