Surface potential of PPy-diamond heterojunction as function of illumination and time. (a) Three-dimensional representation of surface potential map, and (b) temporal potential profiles that were obtained via KFM scanning across PPy-diamond and bare diamond surface (where PPy was removed) under repeated illumination switching. The positions of profiles are indicated by lines and arrows in the image.
Rezek et al. Nanoscale Research Letters 2011 6:238 doi:10.1186/1556-276X-6-238