Development of a Fully-Printed Flexible Polystyrene-Based Temperature Sensor with Anti-Humid Property

We present a simple temperature sensing method based on a polystyrene (PS) and graphite (Gt) flakes nanocomposite. The conductive bridge formed by the Gt flakes, in conjunction with the elasticity of the PS with temperature, enables temperature sensing over a wide temperature range. The nanocomposite's hydrophobic nature ensures remarkable stability and resistance to changes in environmental humidity. Our experiments demonstrate that PS-based sensor stability is exceptional across a wide range of environmental humidity, from 10% to 80% RH, with high sensitivity (+0.37% $\ ^\circ \mathrm{C}^{-1})$ for temperature sensing between $20\ ^\circ\mathrm{C}$ and $80\ ^\circ\mathrm{C}$, fast response time in seconds, and high detection resolution to $3\ ^\circ\mathrm{C}$ change. These promising results indicate that the fully printed, flexible temperature sensor is a promising candidate for applications requiring flexible and accurate temperature sensing capabilities.