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PROJECT TITLE :

ZnO Nanotapered Arrays With Successively Modulated Sharpness Via a Supersaturation-Controlled Hydrothermal Reaction for Efficient Field Emitters

ABSTRACT:

ZnO nanotapered arrays (NTAs) with successively modulated sharpness are successfully demonstrated by a unique supersaturation-controlled hydrothermal methodology in zinc-NH3·H2O system. The filament-like, needle-like, sword-like, and pagoda-like ZnO NTAs with cone angle starting from ~zero°, four.9 ± 1.five°, twenty.4 ± three.7° to sixty three.seven ± 2.5° will be obtained in an early supersaturated resolution with totally different supersaturation level. The field emitter based on the sharper ZnO NTAs exhibits a lot of wonderful field emission (FE) performance. The sword-like emitter with cone angle of regarding twenty° presents the foremost glorious FE performance with low flip-on electric field of one.five V·μm-one, low threshold voltage of three.zero V·μm-1, a field enhancement issue of up to 9656 and stability for 60 min. The emitter with the littlest cone angle of regarding 4.9° shows abnormal performance degradation because of joule heating generated tip-melting phenomenon. Accordingly, the sphere emitter with proper sharpness is beneficial to FE devices for high potency. Our study provides a good methodology and throws new light for performance optimization in flat panel displays and electronic devices.


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