Additional file 3: Figure S3.

Control experiments on DWNT membrane to rule out redox current. Cyclic voltammetry scan on DWNT membrane from −0.6 to +0.6 V. Reference /counter electrode, Ag/AgCl; working electrode, DWNT membrane. Both sides filled with 50-mM potassium ferricyanide solution. No Redox peak is found on bare and modified DWNT membrane, which supports the current change that is from ionic rectification.

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Zhan et al. Nanoscale Research Letters 2013 8:279   doi:10.1186/1556-276X-8-279