Fig. 5: Temporal evolution of the surface height and surface potential.
From: Electret formation in transition metal oxides by electrochemical amorphization

Topographic images on the a 0th and b 20th days after formation. c Height profiles of the EfR, and d time dependence of the average height. Relative surface potential maps on the e 0th and f 20th days. g Relative surface potential profiles of the EfR, and h time dependence of the surface potential. The gray lines in d, h are the results of the simulation. All scale bars in a, b, e, f represent 2 μm.