Additional file 1.

f-d Curves, duration time, and schematic diagram. Figure S1. f-d curves obtained from a grounded metal surface before and after the measurement of the electrostatic field. Figure S2. the duration time of the charged sTNP tip under N2condition. Figure S3. f-d curves obtained from sTNP tip under N2 condition. Figure S4. schematic diagram of differences between experimental result and Ansoft Maxwell simulation. (Difference = Fele measured by EXP − Fele simulated by Ansoft Maxwell).

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Chang et al. Nanoscale Research Letters 2013 8:519   doi:10.1186/1556-276X-8-519