  This study reports the successful synthesis of multilayered graphene sheets
via microwave atmospheric pressure plasma. This innovative approach streamlines
and expedites graphene production and other carbon nanostructures, eliminating
the need for catalysts, solvents, or complex processing conditions. Ethanol is
directly injected into a microwave-generated argon plasma plume, leading to the
formation of graphene. Raman spectroscopy revealed characteristic peaks (2D, G,
and D bands) confirming graphene composition, with defects indicated by the D
band. X-ray diffraction analysis supported these findings, indicating a broad
peak at 25 degree corresponding to the (002) plane, affirming a multi-layered
graphene structure. Scanning electron microscopy exhibited crumpled, randomly
oriented graphene sheets, albeit with uneven structures suggesting impurity
incorporation. The presence of defects was quantified through the intensity
ratio of the D to G band (ID/IG) in Raman spectroscopy, revealing a value of
0.80, signifying the presence of defects in the synthesized graphene. The 2D to
G band intensity ratio (I2D/IG) suggested the existence of 7-10 graphene
layers, highlighting the need for further optimization for enhanced graphene
quality and purity.
