Reduced Graphene Oxide/Gold Nanoparticles Modified Screen-Printed Electrode for the Determination of Palmitic Acid

Figure 7

(a) Cyclic voltammogram of 4.0 mM VK₃ in acetonitrile: water (1 : 1, ) in the presence of 3.0 M LiClO₄ using rGO/AuNP-modified SPCE; (b) LSV voltammograms of rGO/AuNP-modified SPCE in 4.0 mM VK₃ consisting of 3.0 M LiClO₄ with various concentrations of palmitic acid: (i) 0.192 mM, (ii) 0.370 mM, (iii) 0.536 mM, (iv) 0.690 mM, and (v) 0.833 mM; and (c) calibration curve of LSV response of palmitic acid with a concentration range of 0.192-0.833 mM scanning in a positive direction from 1.5 V to -1.5 V at a scan rate of 50 mV/s, .

(a)

(b)

(c)