Heterostructured Ti3C2Tx/carbon nanohorn-based gas sensor for NH3 detection at room temperature

In this study, a two-dimensional Ti 3 C 2 T x MXene compounded with carbon nanohorn (CNH) by an electrostatic self-assembly method was proposed and then fabricated as room temperature ammonia (NH 3 ) gas sensors. The successful preparation of the Ti 3 C 2 T x /CNH nanocomposite has been characterized in detail. The NH 3 sensing performance based on Ti 3 C 2 T x /CNH also has been tested at room temperature. The optimal Ti 3 C 2 T x /CNH sensor has a response value of 21.6% to 100 ppm NH 3 at room temperature, which is 10 times higher than that of the pure Ti 3 C 2 T x sensor. Furthermore, this sensor is endowed with excellent selectivity, reliable long-term stability, and reproducibility. The enhanced sensing performance is associated with the interconnected structure and the synergistic effect of Ti 3 C 2 T x and CNH. This work provides an effective way to prepare MXene-based sensitive materials for NH 3 sensors, which shows excellent NH 3 detection potential at room temperature.