 Tea tree extract was used to create graphene nanosheets in atmospheric pressure microwave plasma. This method is faster than other methods and requires less energy. The resulting graphene exhibits a variety of structures including nanohorns, nanorods, and nano-onions. It also demonstrates excellent sensitivity when detecting dire on herbicides. This article was authored by Amadeal Zulfur, Yong Lu, Francisco C. Robles Hernandez and others.