| 초록 |
Two-dimensional (2D) transition metal carbides, especially Ti3C2Tx MXenes, have received a great deal of attention because of their high conductivity and various surface functional groups. It has been demonstrated that gas molecules well adsorb and better interact with the surface and interlayers of MXene compared to other 2D materials, which has been exploited to fabricate highly sensitive gas sensors. Here, we report a facile and efficient method to largely enhance the gas sensing sensitivity of MXenes gas sensors by the addition of metal cations and hydroxyl functional groups. Unlike the existing ion implantation methods which use complicated and difficult processes, we employ a bulk treatment method, which is more practical. We show that the gas response of Ti3C2Tx MXene treated with KOH greatly enhanced the gas sensing performance, in which samples treated with 0.01 M KOH ions shows the highest response toward NH3 and ethanol. We further quantitatively demonstrate the effect of additive type, ion concentration, and d-spacing on the gas sensor response. |
