Materials Research and Education Center, Auburn University , Auburn, Alabama 36849, United States.
Department of Chemical and Biological Engineering, Gachon University , Seongnam, 13120, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Oct 25;9(42):37184-37190. doi: 10.1021/acsami.7b11055. Epub 2017 Oct 11.
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.
可穿戴气体传感器在诊断和监测应用中受到了广泛关注，二维（2D）材料为制造可在室温下工作的气体传感器提供了一个有前途的平台。在本研究中，研究了 TiCT 纳米片在室温下的气体传感性能。通过从 TiAlC（MAX 相）中去除 Al 原子合成了 2D TiCT（MXene）片，并通过简单的溶液浇铸法将其集成在柔性聚酰亚胺平台上。TiCT 传感器成功地在室温下测量了乙醇、甲醇、丙酮和氨气，并表现出 p 型传感行为。所制备的传感器对氨气和丙酮气体的响应最高和最低。理论上计算出丙酮气体的检测限约为 9.27ppm，与其他基于 2D 材料的传感器相比，性能更好。根据 TiCT 的多数载流子与气体之间的相互作用，提出了传感机制。
