Porous Paper-Based Device with Different Electrode Dimensions for Humidity Sensor Applications

Understanding the influence of different dimensions on conductivity is fundamental in many fields, including electronics, material science, and electrochemical sensing. This study investigates the impacts of varying dimensions of electrodes on the conductivity performance of the porous paper-based humidity sensor. Hydrochloric acid (HCl) solution was chosen for its potential to alter the surface properties of the paper to form porous paper. Interdigitated electrode structures with varying dimensions were fabricated using porous paper. It is found that a smaller electrode gap size provides better conductivity and less resistance. A wider finger width provides more conductive pathways for electrons to travel, increasing conductivity. In comparison to a smaller electrode finger width, the wider electrode finger width transmits more current.