2-D Ti₃C₂T_X MXene nanosheets are obtained by etching Ti₃SiC₂ MAX phase that is synthesized by heating the elemental Ti, Si, and C mixture at high temperature. The electron emission behavior of both Ti₃C₂T_X MXene and Ti₃SiC₂ MAX phase is studied. MXene exhibits excellent field emission characteristics with a turn-on field of 4.7 V μm^–1, and that for the Ti₃SiC₂ MAX phase is 6.5 V μm^–1. The turn-on electric field corresponding to an emission current density of 10 μA cm^–2 is 5.0 V μm^–1 for Ti₃C₂T_X MXene and 7.5 V μm^–1 for the Ti₃SiC₂ MAX phase. The calculated enhancement factor of MXene nanosheets is ∼4280, which is one of the highest reported enhancement factors to date. In order to get theoretical insight into the field emission properties for Ti₃C₂ and OH-terminated Ti₃C₂ MXene in comparison to the Ti₃SiC₂ MAX phase, we have presented the structure and electronic properties from state of the art density functional theory (DFT) simulations. The interaction of – OH with Ti₃C₂ involves charge transfer from the “Ti” 3d orbital to −OH. The computed work function follows the trend Ti₃SiC₂ > Ti₃C₂ > Ti₃C₂/OH, which supports the maximum field emission in −OH-terminated Ti₃C₂ MXene and the minimum field emission in the Ti₃SiC₂ MAX phase.

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