Charge-discharge curves and charging process of the capacitor. (a) The charge-discharge curves of the fabricated capacitor with an electrode radius of 400 μm, and the inset shows the equivalent resistor-capacitor circuit. (b) The charging process of the capacitor under different voltage supplies such as 1, 0.6, and 0.2 V.
Li et al. Nanoscale Research Letters 2012 7:544 doi:10.1186/1556-276X-7-544