Morphology-dependent low macroscopic field emission properties of titania/titanate nanorods synthesized by alkali-controlled hydrothermal treatment of a metallic Ti surface

Title
Morphology-dependent low macroscopic field emission properties of titania/titanate nanorods synthesized by alkali-controlled hydrothermal treatment of a metallic Ti surface
Author(s)
주상우아니타바너지나라얀민봉기
Keywords
SENSITIZED SOLAR-CELLS; NANOTUBE ARRAYS; ENHANCEMENT FACTOR; TITANIA NANOTUBES; CARBON NANOTUBES; THIN-FILMS; NANOSTRUCTURES; GROWTH; PERFORMANCE; NANOWIRES
Issue Date
201509
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.26, no.35
Abstract
One-dimensional (1D) and two-dimensional (2D) titania/titanate nanostructures are fabricated directly on a self-source metallic titanium (Ti) surface via in situ surface re-construction of a Ti substrate using potassium hydroxide (KOH) under a hydrothermal (HT) condition. The effect of temperature and the concentration of KOH on the variations in morphology and titania-totitanate phase changes are studied and explained in detail. A growth model is proposed for the formation process of the platelet-to-nanorod conversion mechanism. The field emission (FE) properties of titania/titanate nanostructures are studied, and the effects of the morphologies (such as 1D nanorods, 2D nanoplatelets, and a mixture of 1D nanorods and 2D platelets) on the FE properties of the samples are investigated. The samples depict a reasonable low turn-on field and emission stability. The FE mechanism is observed to follow standard Fowler-Nordheim (FN) electron tunneling. The geometrical field enhancement factor (beta) is measured to be very high, and is compared with theoretical values calculated from various existing models to explore the feasibility of these models. The surface modification of metallic Ti by a simple non-lithographic bottom-up method and the low-macroscopic FE properties can provide a potential alternative to field emission displays for low-power panel technology.
URI
http://hdl.handle.net/YU.REPOSITORY/31019http://dx.doi.org/10.1088/0957-4484/26/35/355705
ISSN
0957-4484
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공과대학 > 기계공학부 > Articles
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