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. Author manuscript; available in PMC: 2016 Dec 26.
Published in final edited form as: ACS Appl Mater Interfaces. 2016 Sep 8;8(37):24306–24309. doi: 10.1021/acsami.6b07440

Figure 2.

Figure 2

SKPM study of the surface potential of (a) nonpolarized KNN, (b) KNN+70 (positively polarized KNN), and (c) KNN−70 (negatively polarized KNN). The 3D map combination of height and potential profiles illustrates that the observed potential change is not caused by height change. This figure shows that the surface potential of KNN is increased by positive polarization and reduced by negative polarization.