Morphological optimization of large-area arrays of TiO2 nanowires & nanotubes for enhanced cold field emission: experiment and theory
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- Title
- Morphological optimization of large-area arrays of TiO2 nanowires & nanotubes for enhanced cold field emission: experiment and theory
- Authors
- Choi, MG; Zhang, Z; Chen, JK; Deng, ZX; Yong, KJ
- Date Issued
- 2015-02
- Publisher
- Royal Society of Chemistry
- Abstract
- Designed by finite elemental modelling, large-area arrays of TiO2 nanowires and nanotubes with differentiated heights mixed together are synthesized on a planar Ti wafer via hydrothermal methods. Experimental measurements reveal that the TiO2 nanowire/tubes arrays with differentiated heights demonstrate a lower shielding effect and their cold field emission (CFE) performances can be further enhanced by increasing their height/diameter ratios for both the nanowires and nanotubes. Theoretically, the TiO2 nanowires and nanotubes are simplified to a "Zero Thickness Charge Disc (ZTCD)" model, based on which their characteristic macroscopic field enhancement factors (gamma C) are quantified. The theoretically calculated gamma C values are in good agreement with the experimental ones of the TiO2 nanowires and tubes with a series of geometrical parameters. The TiO2 nanowires and nanotubes have promising potential in CFE. The "ZTCD" model is valuable for future research on quasi-one-dimensional field emitters.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13054
- DOI
- 10.1039/C5RA01558H
- ISSN
- 2046-2069
- Article Type
- Article
- Citation
- RSC Advances, vol. 5, no. 25, page. 19470 - 19478, 2015-02
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