Room Temperature Gas Sensing of Two-Dimensional Titanium Carbide (MXene)

Abstract

Wearable 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 TiCT nanosheets was investigated. 2D TiCT (MXene) sheets were synthesized by removal of Al atoms from TiAlC (MAX phases) and were integrated on flexible polyimide platforms with a simple solution casting method. The TiCT 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 TiCT and gas species.

High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

“…MXenes, as newly kind 2D materials, combine the rich surface terminations of function groups and high electrical conductivity, which indicates that they have the potential to make a great RT sensing material . Theoretical researches and experimental explorations in recent years have indeed proved this. Professor Cheng's studies, using first‐principle simulation, have shown that Ti 2 CO 2 and Ti 2 C 2 (OH) 2 could be excellent sensing materials for NH 3 gas molecules detection .…”

“…As a kind of traditional sensing materials, metal oxide semiconductors can only work at high temperatures due to the presence of an activation energy . MXenes, as newly kind 2D materials, combine the rich surface terminations of function groups and high electrical conductivity, which indicates that they have the potential to make a great RT sensing material . Theoretical researches and experimental explorations in recent years have indeed proved this.…”

White Photoluminescent Ti3C2 MXene Quantum Dots with Two‐Photon Fluorescence

“…The outstanding properties of MXenes distinguish them from traditional 2D materials and make them promising candidates for energy storage and environmental applications, such as supercapacitors, lithium-ion batteries, and pollution treatment. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] The recent decomposition of 2D nanosheets into 0D nanodots has been used to develop materials for photocatalysis, sensors, and energy conversion owing to the unique confinement effect of 0D structures. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] The recent decomposition of 2D nanosheets into 0D nanodots has been used to develop materials for photocatalysis, sensors, and energy conversion owing to the unique confinement effect of 0D structures.…”

Ti3C2 MXene Paper for the Effective Adsorption and Controllable Release of Aroma Molecules

“…In addition, the hydrophilic surface of MXene manifests the facile processing in aqueous environment without additional surfactant and surface modification, which facilitates the preparation of films and surface coatings. So far, MXenes have shown a wide variety of applications including the sensing, energy storage, catalysis, and photothermal conversion …”

“…[31,32] In addition, the hydrophilic surface of MXene manifests the facile processing in aqueous environment without additional surfactant and surface modification, which facilitates the preparation of films and surface coatings. So far, MXenes have shown a wide variety of applications including the sensing, [33][34][35] energy storage, [36] catalysis, [37,38] and photothermal conversion. [39][40][41][42] Olfactory sensing and perception play an important role in people's daily lives and greatly affects senses, emotions, and behavior.…”