Different parameters associated with cold emission characteristics for the pure and doped samples.
| Sample | Electrode distance (μm) | E TO (V μm−1) | β | ϕ eff (eV) |
|---|---|---|---|---|
| ZnO | 300 | 5.34 | 2399 | 0.0299 |
| Ni doped ZnO | 300 | 2.84 | 3372 | 0.0190 |
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