Frequency Investigation of Open-Circuit and Short-Circuit Signals Produced by a Bio-Polymer Based Deformation Sensor

This study investigates the signals generated by a bacterial cellulose-based deformation transducer. The device consists of a three-layer structure with a porous bacterial cellulose core infused with 1-Ethyl-3-methylimidazolium methanesulfonate (EMIM-TFMS) as an ionic liquid, enclosed by two conducting polymer electrodes. When subjected to bending deformation, the structure induces charge accumulation, leading to voltage generation in open-circuit conditions or current flow in short-circuit conditions. A thorough experimental frequency analysis is conducted to evaluate the transduction capabilities of this composite under both conditions, with results analyzed in the frequency domain. The study also details the experimental setup used for the investigation. This work enhances the state of the art by expanding on previous findings related to bacterial cellulose with EMIM-TFMS, offering a more comprehensive and in-depth analysis of its frequency response and electrical behavior. The transducer is tested in short-circuit mode using a current-to-voltage (I/V) converter, and the results are compared to those obtained under open-circuit conditions. This research provides valuable insights into the optimal conditioning strategies for developing highly efficient motion sensors based on this emerging class of materials. By improving the understanding of their transduction mechanisms, this study contributes to their potential application in flexible, lightweight, and bio-compatible sensing technologies, with promising implications for wearable electronics and biomedical devices.