Scanning electrochemical Microscopy(seCM) R Diffusion is hemispherical =nfC D where a= diam of UME Acquire I vs tip position (x, y) Plot of d vs tip position piezoelectric positioning d ◆ Bipotentiostat Sample Ref Bard et al. Science 1991.254.68-74Scanning Electrochemical Microscopy (SECM)  Diffusion is hemispherical  i ss = 4 n F Co * Do a where a = diam. of UME  Acquire I vs. tip position (x,y)  Plot of d vs. tip position  piezoelectric positioning  Bipotentiostat Sample C W R Ref.: Bard et al. Science 1991, 254, 68-74. d