Figure 1 | Scientific Reports

Figure 1

From: Enhanced Cold Field Emission of Large-area Arrays of Vertically Aligned ZnO-nanotapers via Sharpening: Experiment and Theory

Figure 1

ZnO-nanotaper arrays electrodeposited on Zn-plate in an initial 0.2 M Zn(NH3)42+ electrolyte with continuously injecting deionized (DI) water at 0.05 mL/min.

(a), (b), Top- (a) and side-view (b) SEM images of the ZnO-nanotaper arrays (the insets are the close-up views). (c), TEM image of a single nanotaper (the inset is the SAED pattern). (d), Lattice-resolved TEM image taken on the nanotaper shown in (c). (e), Macroscopical current density (JM) as a function of the applied electric field (FM) for the arrays of ZnO-nanotapers with apical angle (θ) of 15° (red circles) and the ZnO-nanorods with the same bottom diameter of ~200 nm and the same height of ~2 μm (black squares). The insets are the corresponding F-N plots displayed with ln(JM/FM2) and 1/FM.

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