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Table 1 Field emission parameters and morphological sizes of the synthesized In ₂ O ₃ nanostructures

From: Field emission properties and growth mechanism of In₂O₃ nanostructures

Characteristics	r(nm)	d(μm)	β	s
In₂O₃ nanoneedles	25	300	3,695	0.307
In₂O₃ nanohooks	50	300	1,770	0.295
In₂O₃ nanorods	62.5	300	1,374	0.286
In₂O₃ nanotowers	150	300	458	0.229

r, average radius of curvature at the tip; d, cathode–anode distance; β, field enhancement factor; s, factor evaluating the screening effect that derived from Equation 5.

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