Fowler–Nordheim Law Correlated with Improved Field Emission in Self‐Assembled NiCr₂O₄ Nanosheets

Electric field emission (FE) properties are measured on self‐assembled NiCr₂O₄ nanosheets in a planner “diode” arrangement at a base pressure of ≈1.0 × 10⁻⁸ mbar. The turn‐on field at FE current density 1 μA cm⁻² and the threshold field at FE current density 10 μA cm⁻² are observed as 4.10 and 4.94 V μm⁻¹, respectively. The local work function (Φ) is calculated as 4.358 eV, using density functional theory (DFT) in Quantum Espresso code and field enhancement factor (β) intensified up to 2074 from the sharp edges of the NiCr₂O₄ nanosheet arrays’ emitter surface. An exemplary FE current stability is observed from the current–time plot over a period of 4.5 h. The field enhancement factor (β), inferior turn‐on field, and superior stability compared with any other pristine nanosheet compound recommend its potential application in flat panel display and vacuum micro‐/nanoelectronics.