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. 2018 Jan 29;9:417. doi: 10.1038/s41467-017-02572-3

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Mechanism study for the change of the threshold properties. Log I–Log V curves measured at different temperatures of the partially electroformed state obtained by applying (a) 2 V (80 ~ 140 °C), (b) 3 V (70 ~ 120 °C) pre-pulses and (inset to a and b). Extracted activation energy for hopping conduction between 0.01 V and 0.05 V ranges. (c) Temperature dependent I–V curves for fully electroformed state obtained by applying 4.5 V pre-pulse and (inset to c) (R–R_413K)/R_413K vs. temperature plot. Schematic diagrams illustrating the distribution of Ag ions in (d) the normal off state, (e and f) partially electroformed state (2, 3 V), and (g) fully electroformed state (4.5 V)