Electrochemical Imaging of Polycrystalline BDD

SECM SG-TC images (tip size 2 pm) and C-AFM images were also recorded on H-terminated NC BDD thin-film electrodes, grain size 15-20 nm, of different dopant densities in the range of approximately 0 to mid-10 ° B atoms cm [118]. For the undoped NC electrodes, C-AFM revealed a number of conducting pathways, attributed to NDC content at grain boundaries, a conclusion also reached by 

SECM SG-TC image of polished free-standing MC BDD, 5(X) pm X 500 im, for substrate 

Others in complementary experiments [123]. SECM was used to map the electrochemical activity ofthe highest doped NC electrodes and revealed a spatial heterogeneity for all three redox systems investigated (Ru(NH3)g /Fe(CN)g /lrClg ). 

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