Recent advances of Ion Sensing based on Flexible Low Temperature Thin Film Transistors

This paper presents a review of the most recent and relevant works about ion sensitive systems based on Thin Film Transistors (TFTs) fabricated on flexible substrates at low temperatures. Currently, supervising ion concentrations in biological solutions such as body fluids is of great importance to evaluate the health condition of the human body in order to diagnostic diseases. Flexible and wearable ion sensors allow monitoring chemical status of an individual in real time and in a no-invasive way. Nowadays, TFTs are strong candidates to be employed for design of such applications, either in electrolytic gate or extended gate configuration, because of its fabrication process is relatively easy on flexible substrates at low temperatures, low cost and they can incorporate biocompatible sensing materials.