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. 2015 Jul 8;5:11612. doi: 10.1038/srep11612

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(a) Field emission characteristics of different field emission devices (conformal coated rGO on annealed TiO₂ NTAs hybrid structure, annealed TiO₂ NTAs, as-synthesized TiO₂ NTAs, rGO-commercial TiO₂ NPs, commercial TiO₂ NPs, rGO-Ti sheet, rGO and Ti sheet samples), (b) stability of field emission currents from a typical field emission device (conformal coated rGO on annealed TiO₂ NTAs hybrid structure) at 230 voltages and (c) Fowler-Nordheim characteristics curves for different field emission devices (conformal coated rGO on annealed TiO₂ NTAs, annealed TiO₂ NTAs, as-synthesized TiO₂ NTAs and commercial TiO₂ NPs).