A review on Ti 3 C 2 T x ‐based nanomaterials: synthesis and applications in gas and humidity sensors

Ti 3 C 2 T x , which is a novel two‐dimensional (2D) material, has received enormous interest in the field of sensor technology due to its large surface area, excellent electrical conductivity, and abundant active surface sites. In recent years, several Ti 3 C 2 T x ‐based gases and humidity sensors have been developed and reported. In this review, we focus on the latest applications of Ti 3 C 2 T x ‐based nanomaterials in gas and humidity sensors. First, the synthesis of Ti 3 C 2 T x from the dangerous fluorine‐containing etching process to the safe fluorine‐free preparation method was discussed, and the structures of the Ti 3 C 2 T x controlled by different delamination methods were also outlined. Subsequently, the functionalization of pristine Ti 3 C 2 T x and composite strategies for enhancing its gas and humidity sensing performance were reviewed. In addition, the gas and humidity sensing mechanisms of sensors based on Ti 3 C 2 T x were also summarized. Finally, the challenges and opportunities for the use of Ti 3 C 2 T x gas and humidity sensors were discussed to provide guidance on the promising potential of Ti 3 C 2 T x in this field.