“Living” First-Order High-Pass Filter Based on Sansevieria and Lucky Bamboo Plants

This study explores plant-based living electronic systems, aiming to create biodegradable solutions that also contribute to CO2 absorption from the environment. Specifically, it investigates the use of plant stems to develop eco-friendly circuit components for sensor signal conditioning. Electrical characterization was conducted on the stems of Sansevieria cylindrica and Dracaena sanderiana, analyzing their capacitive and resistive properties in the laboratory. The experimental findings were compared with a mathematical model for dielectric materials, emphasizing how capacitance changes with the frequency of the input voltage signal (20 Hz to 200 kHz) and the distance between electrodes applied to the plant. A passive first-order high-pass filter was then designed and tested using these stems. The optimal configuration was determined based on the measured electrical properties, resulting in a filter capable of effectively attenuating low-frequency signals. This research demonstrates the feasibility of developing fully biodegradable signal conditioning systems, with designs adaptable to the geometric features of different plant stems.