Table 1.

Colorimetric sensors based on graphene and its derivatives.

Materials	Analytes	Symbolic Parameters	Ref.
Graphene nanoribbons	Dopamine	This colorimetric sensor had a good linear in the concentration range of 0.1–50 μM with a LOD of 0.035 μM.	[16]
Heteroatom-doped graphene	Pesticides	The nanozyme sensor arrays exhibited linear response of five pesticides in the range of 5 to 500 μM.	[28]
L-cysteine functionalized graphene oxide	Hg2+	The colorimetric sensor was developed with CGO as an oxidase mimic for determination of Hg2+ with linear ranges of 0–200 μg/mL, and the LOD was 7.6 μg/mL.	[29]
Metal ions-TPA@GQDs	Thiols	—	[31]
Hemin–graphene nanosheets	Thyroglobulin	The gray intensity of the proposed paper-based sensor proved to be proportional to the concentration of thyroglobulin in the range of 5–100 ng/mL with a LOD of 1 ng/mL.	[32]
His@AuNCs/RGO	Nitrite	Under the optimized conditions, the proposed sensor showed a good linear correlation with nitrite concentration in the range of 10–500 μM with a LOD of 2 μM.	[33]
G/Fe3O4-Au NPs	Pb2+	Sensitive detection of Pb2+ was performed in the range of 1 to 300 ng/mL with the LOD was 0.63 ng/mL.	[34]
Oligonucleotide-GO/Au NPs	Hg2+	The absorbance value at the wavelength of 655 nm was linearly related with the concentration of Hg2+ in the range between 5.2 × 10−9 M and 1.2 × 10−7 M, and the LOD was 3.8 × 10−10 M.	[35]