Skin‐like ultra‐sensitive gas flow sensing based on ionically conductive organogels

Abstract Sensitive gas flow sensors serve as the technical foundation for enabling precise gas control, demonstrating their critical role and broad application potential in numerous fields, such as medical diagnosis, rehabilitation robots, aerospace equipments, wearable electronics, and somatosensory systems. However, existing monitoring technologies present significant challenges in power consumption, low detection limits, and miniaturization for next generation equipments. Herein, we developed a new type of thin‐film gas flow sensors based on organogels for the first time, to the best of our knowledge, with ions acting as the charge carriers. Flexible gas flow sensors based on porous polyaniline/ion‐gel network films were constructed, leveraging a reversible ion‐mediated cooperative effect. The resulted skin‐like gas flow sensor exhibited excellent sensing performance toward ultra‐low gas flow, featuring low operation voltage (down to 30 mV), high sensitivity (up to 42.91 m −1 ·s), and an ultra‐low detection limit of 0.11 mm·s −1 gas flow velocity. The sensor's highly sensitive performance is attributed to the facile adsorption‐dissolution of gas molecules (e.g., N 2 , Ar, O 2 , CO 2 ) on the porous conductive polymer, which effectively modulate ionic transport process and lead to sensitive sensor signal responses. In addition, the designed flexible sensor exhibits good bending stability and the capability for large‐scale miniaturized fabrication, can be easily integrated into wearable devices, and supports wireless Bluetooth connectivity, holding significant potential for health monitoring, electronic skins, robotics, and flexible electronics. image