Stable Field Emission from Layered MoS2 Nanosheets in High Vacuum and Observation of 1/f Noise.

Field emission and current noise of hydrothermally synthesized MoS₂ nanosheets are investigated in ultrahigh- vacuum and industrially suited high-vacuum conditions. The study reveals that the emission turn-on field is pressure dependent. Moreover, the MoS₂ nanosheets exhibit more stable field-electron emission in highvacuum than in ultra-high-vacuum conditions. The investigations on field-emission current fluctuations show features of 1/f-type noise in ultra-high-vacuum and highvacuum conditions, attributed to adsorption and desorption processes. The post-field-emission results indicate the MoS₂ nanosheets are a robust field emitter in highvacuum conditions. [ABSTRACT FROM AUTHOR]