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

Abstract

Porous nitrogen-doped Ti3C2T[Formula: see text] 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 Ti3C2T[Formula: see text] nanosheets, some defects generate around the doped nitrogen atoms, which can greatly improve the surface hydrophilicity and adsorption capacity of Ti3C2T[Formula: see text] Mxene nanosheets. It resulted in the enhanced gas sensitivity, achieving a response value of about 36 ([Formula: see text]/[Formula: see text] × 100%) and excellent recovery time (9s) at 150[Formula: see text]C. Compared with the pure Ti3C2T[Formula: see text]-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.

Potential of MXenes as a novel material for spintronic devices: a review

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MXene and their integrated composite-based acetone sensors for monitoring of diabetes

“…KWO/Ti 3 C 2 T x showed the best response at a 2 : 1 ratio. Z. Wang et al 161 showed the porous nitrogen-doped Ti 3 C 2 T x used as an acetone gas sensor due to its three-dimensional structure, which was synthesized by the sacrificial template method. When heteroatoms such as nitrogen atoms are introduced into Ti 3 C 2 T x nanosheets, certain defects are produced throughout the nitrogen atoms, which can improve the hydrophilicity and adsorption characteristics of the Ti 3 C 2 T x nanosheet.…”

Towards Greener and More Sustainable Synthesis of MXenes: A Review

“…Heterostructures-based MXenes were developed to enhance the gas sensing properties, and they benefit from a built-in Schottky junction and a charge-trapping mechanism [ 151 , 152 ]. Surface and structural engineering have been approved as alternative techniques to improve the gas sensing of MXenes towards VOCs [ 153 , 154 ]. Herein, we emphasize and provide the recent application of green MXenes for gas sensors.…”