Overview of Graphene-based materials included in the text.

Material/composition	Focus	Important outcome	Ref.
Graphene	Synthesis, characterization	Dimension, surface area, breaking strength, Young's modulus, conductivity, electron mobility	1–10
	Application	Capacitors, batteries, water purification system, biomedical devices	11–23
Graphene oxide	Synthesis, characterization	Hydrophilic nature, dispersible in water, inorganic and organic solvents	24–30 and 38
	Applications	Biomedical	59–64
		Supercapacitor	65–73
		Li-ion batteries	74–79
		Harmful gases removal	80–90
Reduced graphene oxide	Synthesis, characterization	Structure and physical properties	31–34
GO–metal, semimetal, metal oxide composite	Applications (reviews)	Energy storage, antibacterial and antioxidant property, biosensors	94–104
GO–CuO/Cu2O	Synthesis (hydrothermal, solvothermal method) and application	Biosensor, photocatalytic and antibacterial property	107–116
GO–AgO/Ag2O	Synthesis and application	Antibacterial and photocatalytic efficiency	117–142
GO–ZnO	Synthesis and application	Photocatalyst and antibacterial agent	144–158
GO–iron oxide	Synthesis (in situ, solvothermal methods) and application	Photocatalyst, targeted drug delivery	159–185
GO–NiO	Synthesis and application	Photocatalyst	186–190
GO–CdO	Synthesis and application	Photocatalyst	191
GO–ZrO2	Synthesis and application	Removal of heavy metal (As, Cr) from water, photocatalyst	192–198
GO–TiO2	Synthesis and application	Photocatalyst	199–205
GO–MgO	Synthesis (hydrothermal and solvothermal method) and application	Photocatalyst	206–215
GO–EDTA	Application	Removal of Cu, Ni	216–219
GO–chitosan, GO–porphyrin	Application	Adsorption, dye removal	220–231
GO–polymer	(i) Synthesis (solution blending), performance	(i) Improved strength, elongation, durability	(i) 233–248
(i) PVA, PMMA, epoxy, etc.	(ii) Synthesis, application	(ii) Improved performance, application in energy storage, biosensing, PTT	(ii) 249–270
(ii) Conducting polymers (PAn, PPy, MO)