Plasma‐Based Synthesis of Freestanding Graphene from a Natural Resource for Sensing Application

Atmospheric pressure microwave plasma has the lead in synthesizing freestanding and scalable graphene within seconds without need for high vacuum temperature. However, process is limited utilizing chemical sources synthesis, such as methane ethanol. Herein, usage of an extract a sustainable precursor, that is, Melaleuca alternifolia, commonly known tea tree, first time reported to synthesize nanosheets atmospheric plasma. The synthesis carried out single step at remarkably low power 200 W. morphology, structure, electrochemical properties are studied using state-of-the-art characterization techniques Raman spectroscopy, X-ray diffraction, transmission electron microscopy (TEM) impedance spectroscopy. TEM images reveal presence combination nanostructures nano-horns, nano-rods, or nano-onions consisting multi-layer graphitic architectures. An excellent sensing capability as-synthesized demonstrated through detection diuron herbicide. A commendable linear range 20 µm 1 mm limit 5 recorded.