"This substrate and control of electrode resistances can prevent stretch deformation of the device from affecting the sensing of pressure." "In addition, resistances of column and row electrodes in the matrix of the mapped array are much lower than the ones of the pressure sensors," Ota said.
The containment also allows the sensors to identify and measure both pressure and strain as independent contributors to movement. The soft, porous silicone pressure sensor is contained within the hard shell of the PDMS, so it can measure the force of pressure without being overextended past reliable margins of error. "The PDMS around the pressure-sensing elements prevents the development of large deformations of the elements during the developed device tension," Ota said. At the center of each PDMS placement, they positioned soft porous silicone, which senses pressure. They placed a hard silicone, called PDMS, along electrodes over the array. They used two different materials-one soft and one hard-to protect the sensor's ability to stretch and still accurately measure movement. To combat this, the researchers proposed a monolithic array of pressure and strain sensors that can simultaneously and independently detect the force and bend deformation of motion. This stops the sensor from being able to measure pressure and strain at the same time, but as independent variables. The bend of an elbow or a knee can push the sensor past its structural integrity, producing a large error on the pressure movement measurement. "However, current stretchable pressure sensors composed of elastic materials can be highly deformed during the strain of the devices." "Stretchable physical sensors are crucial for the development of advanced electrical systems, particularly wearable devices and soft robotics," said Hiroki Ota, paper author and associate professor in the Faculty of Engineering at Yokohama National University.
They published their results on July 29 in the Scientific Reports.
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