Development of Piezoresistive Strain Sensors Using Nanocomposite on Flexible Substrates: A COMSOL Multiphysics Simulation Study
K. Saujanya, B. Poornaiah, A. Kamala Kumari and Y. Srinivasa Rao
The potential uses of flexible piezoresistive strain sensors based on polymer nanocomposites in wearable electronics, motion detection for people, and structural health monitoring have attracted a lot of interest. In this work, a nanocomposite consisting of graphite, nickel (Ni) nanoparticles, and polyvinyl chloride (PVC) as the elastic polymeric matrix is used to develop and model a piezoresistive strain sensor. High sensitivity, wide operating strain range, and mechanical flexibility are given top priority in the sensor design. We simulate the electromechanical behaviour of the Ni-graphite-PVC piezoresistive strain sensor under different geometrical configurations and strain levels using COMSOL Multiphysics and the finite element method (FEM). Important parameters are evaluated, such as gauge factor (GF), electrical resistance change, and displacement distribution. The results indicate that by changing the mix of materials and the shape of the sensor, we can create flexible sensors that are very sensitive and can easily bend. These findings pave the way for innovative applications in wearable technology and smart devices, where adaptability and responsiveness are crucial. As researchers continue to explore these materials, we can expect significant advancements in the field of flexible electronics.
Keywords: Piezoresistive, strain sensor, resistance