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. 2019 Sep 2;9(9):1245. doi: 10.3390/nano9091245

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© 2019 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The linear relationship between $\ln I_{d s}$ and $\sqrt[4]{| V_{r} |}$ . (a) Reverse direction (V_ds > 0). (b) Forward direction (V_ds > 0).