am7b11055_si_001.pdf (279.02 kB)
Room Temperature Gas Sensing of Two-Dimensional Titanium Carbide (MXene)
journal contribution
posted on 2017-09-27, 00:00 authored by Eunji Lee, Armin VahidMohammadi, Barton C. Prorok, Young Soo Yoon, Majid Beidaghi, Dong-Joo KimWearable
gas sensors have received lots of attention for diagnostic and monitoring
applications, and two-dimensional (2D) materials can provide a promising
platform for fabricating gas sensors that can operate at room temperature.
In the present study, the room temperature gas-sensing performance
of Ti3C2Tx nanosheets
was investigated. 2D Ti3C2Tx (MXene) sheets were synthesized by removal of Al atoms from
Ti3AlC2 (MAX phases) and were integrated on
flexible polyimide platforms with a simple solution casting method.
The Ti3C2Tx sensors
successfully measured ethanol, methanol, acetone, and ammonia gas
at room temperature and showed a p-type sensing behavior. The fabricated
sensors showed their highest and lowest response toward ammonia and
acetone gas, respectively. The limit of detection of acetone gas was
theoretically calculated to be about 9.27 ppm, presenting better performance
compared to other 2D material-based sensors. The sensing mechanism
was proposed in terms of the interactions between the majority charge
carriers of Ti3C2Tx and gas species.