Muhammad Luthfi Hakim, Herianto, Ardi Wiranata, Seno Darmanto, Djarot Widagdo, Gil N. Santos, Muhammad Akhsin Muflikhun
Flexible strain sensors have application prospects for wearable sensors such as health monitoring, human-machine interface applications, human motions, and soft robots. However, current research is only limited to characterizing strain testing of flexible strain sensors. Whereas in its application, FSS is used to detect bending movements such as finger motion, arm motion, and knee bending. In this research, an innovative tool for strain and bending testing will be developed which aims to determine the performance of the strain sensor. Strain testing is performed in the range of 0–50 %, while the bending angles are 45°, 90°, and 135°. The flexible strain sensor is made using the sandwich method with SR/CNT/SR constituent material. SEM and FTIR observations were conducted in this study. In addition, performance testing of the strain sensor, such as sensitivity, response and recovery time, linearity, and durability, were systematically revealed. The results show that the SR/CNT/SR flexible strain sensor has a high sensitivity value of GF 168 (0–50 %). In addition, the strain sensor has response and recovery values of 170 ms and 225 ms for 20 % strain and 150 ms for 90° bending angle. The SR/CNT/SR strain sensors also have similar relative resistance values (ΔR/R0) after repeated stretching and bending for 20 cycles. In addition, the sensor is also able to withstand loading and unloading durability for 1000 cycles. These strain sensors can be applied to human motion detection such as mouth, finger, and wrist movements to help in improvement therapy treatment. © 2025 Elsevier B.V.
Mechanical and Industrial Engineering Department, Universitas Gadjah Mada, Grafika Street No. 2, Special Region of Yogyakarta, Yogyakarta, 55281, Indonesia; Departement of Electrical Engineering Education, Faculty of Engineering, Universitas Negeri Yogyakarta, Yogyakarta, Indonesia; Department of Mechanical Engineering, Diponegoro University, Jl. Prof. Jacub Rais, Kota Semarang, 50275, Indonesia; Department of Aerospace Engineering, Bandung Institute of Technology, Jl. E ITB Jl. Ganesa No.10, Lb. Siliwangi, Kecamatan Coblong, Kota Bandung, 40132, Indonesia; Physics Department, De La Salle University, 2401 Taft Ave, Malate, Manila, Metro Manila, 1004, Philippines; Center for Energy Studies (PSE), Universitas Gadjah Mada, Yogyakarta, Indonesia
