Abstract
Low-power triethylamine (TEA) detection at room temperature (RT) is becoming increasingly significant in practical scenarios. As a novel two-dimensional material, Ti3C2Tx MXene has a high potential in the field of chemical sensing at RT. It is essential to acquire the composition of the surface functional groups for Ti3C2Tx since the surface chemistry is crucial for a strong interplay between the target gas and Ti3C2Tx. In this work, the surface functional groups were quantitatively evaluated (approximately 40 % -O, 60 % -F) based on the combined usage of XPS analysis and DFT simulations. Ti3C2F1.2O0.8 was determined to be metallic according to the calculated total density of states and band structure. A metal-semiconductor-type composite nanostructures based on the single/few-layer Ti3C2Tx and Bi2WO6 microcages were fabricated with different Ti3C2Tx mass percentages. 0.1 wt% Ti3C2Tx/Bi2WO6 composite demonstrates a response enhancement by 52 % compared with the pristine Bi2WO6 in the detection of 500 ppm TEA at RT. Besides, the sensitization mechanism is ascribed to the abundant surface functional groups and the catalytic effect of Ti3C2Tx.
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