A facile method for preparation of porous nitrogen-doped Ti3C2Tx MXene for highly responsive acetone detection at high temperature

Porous nitrogen-doped Ti3C2Tx MXene (N-TCT) with a three-dimensional network structure is synthesized via a simple sacrifice template method and then utilized as an acetone gas sensor. By introducing nitrogen atoms as heteroatoms into Ti(3)C(2)Tx nanosheets, some defects generate around the doped nitrogen atoms, which can greatly improve the surface hydrophilicity and adsorption capacity of Ti(3)C(2)Tx Mxene nanosheets. It resulted in the enhanced gas sensitivity, achieving a response value of about 36 (Delta R/R-a) x 100%) and excellent recovery time (9s) at 150 degrees C. Compared with the pure Ti(3)C(2)Tx-based gas sensor (381/92s), the response and recovery time are both obviously improved, and the response value increased by 3.5 times. The gas-sensing mechanism of the porous N-TCT is also discussed in detail. Based on the excellent gas sensitivity of porous N-TCT for highly responsive acetone detection at high temperatures, the strategy of nitrogen-doped two-dimensional nanomaterials can be extended to other nanomaterials to realize their potential applications.

Automated summary

By introducing nitrogen atoms into Ti3C2Tx nanosheets, porous nitrogen-doped Ti3C2Tx MXene exhibits enhanced surface hydrophilicity and adsorption capacity, leading to improved gas sensitivity and recovery time for acetone gas detection. The strategy of nitrogen-doped two-dimensional nanomaterials can be extended to other nanomaterials for potential applications.