Figure 1: Experimental procedure.
From: Room temperature ferromagnetism in Teflon due to carbon dangling bonds
(a) Schematic illustration of carbon chain structure in Teflon tape (left) and hexagonal arrangement of carbon chains in Teflon (right). Carbon and fluorine atoms are shown in red and blue, respectively. (b) Illustration of cutting of a Teflon tape using a pair of ceramic scissors. (c) Illustration of stretching of a Teflon tape. (d) Schematic illustration of dangling bonds created after cutting. (e) Schematic illustration (side view) of ferromagnetic ordering formed in the 2D network of carbon dangling bonds. Under-coordinated carbon atoms (with a dangling bond) are shown in green. The red arrows indicate magnetic moments. (f) A schematic illustration (side view) of C dangling bonds formed in Teflon by mechanical stretching. C dangling bonds are highly concentrated on the surface of nano-sized voids generated by the mechanical stretching. (g) A cross-sectional view (top view) of 2D network of C dangling bonds in crystalline Teflon subjected to mechanical stretching. Carbon atoms with and without dangling bonds are shown in green and red, respectively.
