Back in 2004, the physics community was starting to recognize the existence of genuinely 2-D (two-dimensional) material, graphene. Fast-forward to 2019, & scientists are investigating a breadth of 2-D materials to reveal more of their basic properties. The craze behind these new 2-D materials lies in their fascinating features materials thinned down to only a few atoms work very in another way from 3-D elements. Electrons carried into the thinnest-ever layer show distinctive traits other than being in a “loose net.” Also being flexible, 2-D supplies might function unique electrical properties, opening up new applications for subsequent-generation technologies such as bendable & wearable devices.
Then, what is the catch? Many parameters such as temperature, pressure, precursor type, and flow rate must be factored into the CVD synthesis of 2-D materials. With multiple reactions involved, this can be very difficult to optimize all these factors during the reactions and find their best combinations. That being stated, 2-D materials synthesis is troublesome to manage. Scientists have attempted to accelerate the growth of 2-D materials by adopting different substrates, feedstocks, and temperature. Nonetheless, only a few kinds of 2-D materials could be synthesized into large-area, high-quality films.
Scientists from the Center for CMCM (Multidimensional Carbon Materials), throughout the IBS (Institute for Basic Science) at the UNIST (Ulsan National Institute of Science and Technology) and collaborators demonstrated that fluorine, having the strongest tendency to draw electrons (i.e., electronegativity) in all elements, can pace up the chemical reaction to grow 3 representative 2-D materials; graphene, h-BN, and WS2. Fluorine requires solely one electron to attain high stability. Also, possessing seven electrons in the outermost orbit of an atom, the distance at which these valence electrons stay is the minimum compared with other elements. This means the valence electrons of fluorine are bound to the atom more strongly than another atom, making fluorine probably the most active element in the periodic table.