971942.fig.008a
(a)
971942.fig.008b
(b)
971942.fig.008c
(c)
971942.fig.008d
(d)
Figure 8: XPS spectra of the C 1s of the carbon plate as model electrode (a), MWNT-modified electrode (b), COOH/MWNT-modified electrode (c), and AChE-ChOx/COOH/MWNT-modified electrode (d).