33‐3: Invited Paper: Flexible Temperature Sensor with Colloidal Quantum Dots (CQD)

Skin‐like temperature sensing is essential for electronic skin, human–machine interactions and soft robotics. In this work, we report the development of a flexible negative temperature coefficient (NTC) thermistor exhibiting a high temperature sensitivity of −2.09 %/°C over a measured temperature range of 20–50 °C, indicating strong resistance modulation with temperature variation. The proposed sensor is fabricated using metal electrodes integrated with a colloidal quantum dot (CQD) sensing layer on a flexible polyimide (PI) substrate for wearable platforms. The sensor follows Arrhenius behavior with a high coefficient of (R² = 0.978), confirming good linearity and stable thermistor performance. Repeated folding test up to 500 cycles at 3 mm radius shows robust performance without noticeable degradation. Finally, a 5 × 5 flexible temperature sensor array with heat map clearly visualizes uniform and localized temperature distribution, confirming the device's capability for large‐area spatial temperature mapping.