3.2. Electrochemical behavior of the DSNPs-GCE
The electrochemical behavior of the DSNPs-GCE was studied
by cyclic voltammetry. Figure 4A indicates the cyclic voltammograms
of a DSNPs-GCE in a 0.10M phosphate buffer solution
(pH 7.0) at various scan rates. When the potential was
scanned between 100mVand 400 mV, a surface immobilized
redox couple with a formal potential (E00
) value of 143 mV was
observed. In addition, the formal potential, E00, was virtually
independent of the potential scan rate for sweep rates ranging
5e500 mV/s, symptomatic of facile charge transfer kinetics
over this range of scan rate.