Facile Fabrication of Oxygen‐Enriched MXene‐Based Sensor and Their Ammonia Gas‐Sensing Enhancement

Abstract

Abstract Various sensing materials have been demonstrated to increase the precision of sensing technology. Nevertheless, this complicates the fabrication process for materials integration to obtain devices that can simultaneously accommodate various gas detectors, like electronic nose. The study here focuses on exploring the sensing response of different functionalization of specific sensing materials to provide an alternative way to achieve selective response to multiple gases. Triethoxysilylpropyl succinic anhydride silane (TESPSA) was introduced on 2D material MXene‐Ti 3 C 2 T x to form carboxylic acid terminated MXene (COOH‐Ti 3 C 2 T x ) and alternately coated with polyaniline (COOH‐Ti 3 C 2 T x /PANI). This modification doubled up the gas binding sites and improved the binding strength of the Ti 3 C 2 T x surface to NH 3 gas molecules. The 5CC‐COOH‐Ti 3 C 2 T x /PANI sensor prepared from five coating cycles showed the highest sensitivity (214.70 %) with fast gas response rate at 80 ppm NH 3 (1.75 % s ‐1 ). Therefore, the different signal responses from specific functionalization of the same sensing material functionalization will allow the possible sensor array fabrication to achieve fingerprint‐like sensing map recognition in the presence of mixed gases.