Flexible Infrared Detectors Based on MWCNT/PEDOT:PSS Nanocomposites by Laser Ablation *

Photothermoelectric (PTE) detectors have emerged as a promising technology for broadband infrared (IR) detection due to their unique ability to convert thermal radiation into electrical signals without requiring an external bias voltage, enabling operation under ambient conditions. However, conventional PTE detectors often suffer from complex fabrication processes, poor material stability, limited flexibility, and inconsistent film formation, hindering their practical applications. To address these challenges, we present a novel flexible IR PTE detector based on a multi-walled carbon nanotube (MWCNT)/poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) nanocomposites, fabricated using a laser ablation patterning technique. The device is realized through a low-cost two-step process: (1) preparation of a stable MWCNT/PEDOT:PSS dispersion into film and (2) direct laser patterning to form well-defined, homogeneous nanocomposite structures. By optimizing the laser ablation parameters, we fabricated the detector exhibits outstanding mechanical flexibility, maintaining stable performance under 100 bending cycles. With its excellent broadband IR detection, flexibility, this MWCNT/PEDOT:PSS-based PTE detector opens new possibilities for wearable health monitoring and smart Internet-of-things (IoTs) systems.