971942.fig.006a
(a)
971942.fig.006b
(b)
971942.fig.006c
(c)
971942.fig.006d
(d)
Figure 6: AFM-3D images of the screen-printed electrode (a), MWNT-modified electrode (b), COOH/MWNT-modified electrode (c), and AChE-ChOx/COOH/MWNT-modified electrode (d).