Compressible piezoresistive pressure sensor based on Ag nanowires wrapped conductive carbonized melamine foam

Abstract

Wearable sensing technology is receiving great attention due to potential applications in smart electronic devices, which requires the sensors own high sensitivity and flexibility at the same time. In present work, we fabricated piezoresistive sensors with the carbonized melamine foam (CMF) and silver nanowires (AgNWs). The CMF and AgNWs interlace and contact each other to form 3D network structures, thus increasing the conductive path. The CMF provided porous skeleton with elasticity. Due to the synergic effect of CMF and AgNWs, the prepared AgNWs@CMF piezoresistive sensor achieved a high sensitivity (4.97 kpa −1 at 30-50 kpa) and excellent stability during cycles within 4000 s (1000 times). Based on the sensor performance tests, it is proved that the AgNWs@CMF pressure sensor can be used to monitor different positions of the human body. This work provided a new opportunity to manufacture CMF based piezoresistive sensors with highperformance in future development of electronic skin.

Three-dimensional AgNps@Mxene@PEDOT:PSS composite hybrid foam as a piezoresistive pressure sensor with ultra-broad working range

“…B.Cai et.al achieved 4.97 kPa −1 sensitivity with a silver-coated carbonization foam. [ 41 ] Combination of Mxene and AgNps increase conductivity, but high concentration brings instability for sensor hence we controlled the composition. Both Mxene and AgNps are powder.…”

“…A simple dipping and coating approach was employed to prepare AgNps-Mxene@PEDOT:PSS sensor. It was possible to acquire a detection range that was greater than that of already accessible works [ 41 , 42 ](from 0.417 to 817.8 N). This hybrid foam sensor can tolerate more than 90% deformation under a 977.6 N load, providing a stable response in a broad load range.…”

Wearable, High-Sensitivity Piezoresistive Pressure Sensor Based on MWCNTs/NiMoO4@CMF for Real-Time Monitoring of Human Activities

“…1−3 At present, pressure sensors mainly work based on four sensing mechanisms. 4,5 This includes piezoelectric effect, capacitive effect, triboelectric effect, and piezoresistive effect. 6,7 Through these sensing mechanisms, pressure sensors can convert the pressure exerted on them into corresponding electrical signals.…”

Hierarchically Structured MXene Nanosheets on Carbon Sponges with a Synergistic Effect of Electrostatic Adsorption and Capillary Action for Highly Sensitive Pressure Sensors

“…In the field of pressure sensors, MXene effectively increases the binding force with the substrate, produces excellent mechanical properties, and has been used to construct high-performance pressure sensors with accordion structures, 3D mixed porous MXene sponges or aerogels, and porous textiles. Carbon sponge , (CMF) is an ideal elastic substrate material for making sensors due to its low price, easy availability, good chemical inertness, and thermal stability . However, how to combine MXene with an elastic substrate is still a challenge.…”

“…Carbon sponge 32,33 (CMF) is an ideal elastic substrate material for making sensors due to its low price, easy availability, good chemical inertness, and thermal stability. 34 However, how to combine MXene with an elastic substrate is still a challenge. The electrostatic self-assembly method has been proven to be an appropriate bonding method which uses the electrostatic interaction between two oppositely charged polyelectrolytes to sequentially adsorb on the surface of a charged substrate after surface treatment to form a strongly bound nanoscale polymer.…”