Table 3.

Peroxidase-like activity of graphene oxide, reduced graphene oxide, or grapheme ^a.

Nanomaterial	Method	Substrate	LOD	Applications	Ref.
GO	Colorimetric	TMB	1.0 μM	Glucose detection	[37]
GO	Colorimetric	Hydroquinone	–	PSA detection	[80]
GO	Voltammetry	TMB	1.0 nM	H2O2 detection	[81]
GO b	Fluorescence	DAB	5.0 pg/mL	IL-5	[82]
Graphene	Electrochemical	TMB	10 nM	H2O2 detection	[83]
rGO (QRGO c)	Colorimetric	TMB	1.0 μM	Glucose detection	[84]

^a LOD, Limit of detection; TMB, 3,3′,5,5′-tetramethylbenzidine; PSA, Prostate specific antigen; DAB, 3,3′-diaminobenzidine; IL-5, Interleukin 5; ^b Intrinsic fluorescence of GO was used to explore a HRP-driven polymerization reaction; ^c RGO represents reduced graphene oxide as per ref. [84]; QRGO, Quinone-mediated reduced graphene oxide.