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. 2019 Oct 17;9:14920. doi: 10.1038/s41598-019-51330-6

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© The Author(s) 2019

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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PVP-Ag nanowire network dynamics under a sliced-time I–V curve from 0 to 3 V. (a) Current time series acquired during an upward voltage step ramp. Voltage steps up by 14 mV and current is acquired for each 20 s window of fixed voltage on either side of the step. (b) Current measured during each 20 s duration of fixed voltage on either side of the step in (a) is plotted as a vertical line (black dot indicates mean value). (c) Typical activation curve obtained by combining current measurements for all upward (blue) and downward (orange) voltages. The inset shows current vs. time series acquired for each upward (blue) and downward (orange) voltages (for clarity, the starting time for all series has been shifted to the origin. (d) Power Spectral Density (PSD) of the current time series in (a) computed for the 1 s window marked by an upward triangle. The black line shows the power-law best fit (note the log-log scale),with exponent β = −1.3. (e) Changes in the PSD power exponent with network conductance calculated for 1 s time windows in all the measured current-voltage data. Points corresponding to the upward voltage ramp (low conductance state, LCS) are colored blue, orange points denote downward voltage ramp (high conductance state, HCS). (f) Probability distribution of PSD power exponent absolute values for the high conductance state network, overplotted with the cumulative probability.