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SEM images showing (a) a 3 × 3 microarray with nine individually addressable 250-μm UNCD microelectrodes. (b, c) an unmodified UNCD and MWCNT-modified UNCD microelectrode at higher magnification, respectively. (d) Cross-sectional view of the MWCNT modified microelectrode interface. Scale bars for (a-d) are 500 μm, 100nm, 100nm and 1 μm, respectively.
