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. 2014 Sep 3;14(9):16343–16422. doi: 10.3390/s140916343

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 15. — Structural morphology and electric field response of vanadium-based materials. (a) The field emission current density (J) dependence on applied electric field for nanospheres (Sample 1), nanoflowers (Sample 2), and nanorods and nanoflakes (Sample 3); (b) Scanning electron micrographs of the nanospheres (1), nanoflakes (2), nanoflowers (3), and nanorods and nanoflakes (4) [91].