(d) 4.8 m thick Ni was electroplated as structural material in the composition of the nickel electrolyte, and 0.2 m thick Au was electroplated to cover Ni coating as good conductors of electricity in the composition of the gold electrolyte. The electroplating conditions are pH = 4.0, the temperature is 40 ◦C, the current density 10 mA/cm2. The thickness of electrodes is controlled by the electroplating time. The thickness of electrodes is also monitored by surface profiler.