Table 1.

Values of the electroactive area and roughness factor of the unmodified and modified graphene-based screen-printed electrode (GPH) with 5 nm and 10 nm diameter gold nanoparticles (AuNPs) at different concentrations.

Electrode	Electroactive Area (mm2)	Roughness Factor (ρ)
GPH	5.0 ± 0.4	1.6 ± 0.2
GPH-AuNPs (5 nm, 7 × 10−4 mM)	5.7 ± 0.3	1.8 ± 0.3
GPH-AuNPs (5 nm, 1 × 10−3 mM)	6.0 ± 0.4	1.9 ± 0.3
GPH-AuNPs (5 nm, 1.4 × 10−3 mM)	6.4 ± 0.3	2.0 ± 0.4
GPH-AuNPs (10 nm, 7 × 10−4 mM)	5.5 ± 0.4	1.7 ± 0.2
GPH-AuNPs (10 nm, 1 × 10−3 mM)	5.9 ± 0.4	1.9 ± 0.4
GPH-AuNPs (10 nm, 1.4 × 10−3 mM)	6.2 ± 0.3	1.9 ± 0.3