Reduced Graphene Oxide (rGO) is a material derived from graphene oxide (GO) by removing some of the oxygen-containing functional groups. This process restores many of graphene's properties, including its high electrical conductivity and mechanical strength, while still allowing for some functionalization due to the remaining oxygen groups.
Properties of reduced graphene oxide
Layered structure:rGO consists of stacked layers of graphene sheets with fewer oxygen-containing functional groups compared to GO (graphene oxide).
Surface area: High surface area, though lower than pristine graphene due to stacking and residual functional groups. 
Conductivity: Significantly higher electrical conductivity than graphene oxide, though lower than pristine graphene. Conductivity depends on the reduction method and extent.
Semiconducting to conductive: rGO shows semiconducting to conductive behavior, making it useful in flexible electronics and sensors. edit. 
Hydrophilicity: Less hydrophilic than GO but more than pristine graphene.
Functionalization potential: Surface can still be chemically functionalized, allowing integration into various matrices |
Residual oxygen functional groups: rGO still retains some –OH, –COOH, and epoxy groups, making it partially hydrophilic and chemically active.
Tunability: Degree of reduction can be controlled, allowing tuning of surface chemistry and properties. 
High strength and stiffness:Better than GO but generally inferior to pristine graphene due to defects and remaining oxygen groups. Flexible and robust: Maintains flexibility, useful in composite materials. 
Absorption: Strong UV-visible light absorption, especially in the visible range due to restoration of the sp² carbon network.
Thermal conductivity and stability : Improved over GO, but lower than pristine graphene. Still useful for thermal management in composites. And thermally stable than GO, which decomposes more easily due to its oxygen content. |