Fabrication of Serpentine-Structured Flexible Strain Sensor of Graphene and Their Potential Applications in Robotics

Abstract

The fast growing world enhanced the utilization of robotic devices. The working of a robotic device in any industry is significantly affected by the electronic parts associated with it. The performance of a robot is observed by the precise control of its movement in various directions. This controlling can be achieved by utilization of a suitable strain sensor. Here we are presenting a flexible strain sensor developed by using graphene nanoparticles. The sensor consists of thin layer of graphene on a flexible PET substrate to maintain high flexibility. A simple and standard fabrication technique is used in the manufacturing of this device. The thin film is patterned into a serpentine structure by masking and etching to improve the sensitivity. The strain performances of the device are observed by using a linear actuator. A significant variation in resistance is observed when the device is tested on variable chord lengths. The importance of number of immersing and oxidation plasma for the achievement of suitable adhesion and conductivity is also shown. To demonstrate the potential of the fabricated device as a robotic movement sensor, we fix it on finger and analyse finger movements at different angles. We are able to detect significant resistance variation.