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Synthesis of Ti3C2Tx-based material for ammonia detection at room temperature
Oral Presentation XML
Authors
1school of chemical engineering, university of Tehran
2school of engineering science, department of engineering, university of Tehran, Iran
3School of Chemical Engineering, Department of Engineering, University of Tehran, Tehran, Iran
4Chemical Engineering, University of Tehran, Tehran, Iran
Abstract
Ti3C2Tx (MXene), a novel 2-dimensional material, has been proved to be promising in the field of room temperature Ammonia sensors by theoretical calculations and experimental testing, but the experimental researches on the MXene gas sensors are limited, for this reason, we need to further the enhance response/recovery characteristics and response value for Ti3C2Tx-based gas sensor. In this study, the room temperature gas sensing performance of Ti3C2Tx nanosheets experimentally was investigated. The fabricated Ti3C2Tx sensor exhibited significant improved NH3 sensing response (∆R/R0= 7.9%, 100ppm NH3) and shorter response/recovery time (280/186 seconds) compared to most previous researches. 2D Ti3C2Tx MXene sheets were synthesized by selectively etching Al atoms from Ti3AlC2 (MAX phase). In short, Etching was done by adding 0.5 gr Ti3AlC2 into the HF solution. The solution was stirred for 30hr. The etched solution was washed with DI water several times and centrifuged until the PH of the supernatant was above 5.5. The resulting powder was collected and bath-sonicated in DI water for 1hr. The obtained solution was centrifuged at 3500 rpm for 1hr, and the resulting black supernatant (delaminated-Ti3C2Tx) was collected for sensor fabrication. In order to investigate the gas sensing performance of the Ti3C2Tx sensor, ammonia gas was exposed to the MXene film at room temperature. Similar to previous reports, the Ti3C2Tx sensor displayed a positive variation of resistance toward NH3. the responses of the MXene gas sensor at 100, 50, 25, and 10ppm NH3 are about 6.93%, 4.05%, 2.91%, and 1.47%, respectively that shows good sensitivity toward ammonia gas. Importantly the fabricated sensor also exhibited good reversibility upon repeated exposure to NH3 indicating that the sensor is stable for certain operation periods.
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