Figure 3 | Scientific Reports

Figure 3

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

Figure 3

Arrays of ZnO-nanotapers with the same height and different sharpness degrees.

(a), Arrays of ZnO-nanotapers with the apical angle of ~10°, achieved from initial 0.1 M Zn(NH3)42+ solution without injection of DI water. (b–d), Arrays of ZnO-nanotapers with apical angles of (b) 15°, (c) 25° and (d) 35° respectively, achieved from initial 0.2 M Zn(NH3)42+ solution by injecting the DI water with flow speed of 0.05, 0.1 and 0.2 mL/min, respectively. The insets are the TEM images.

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