Date Published: June 05, 2012
Publisher: WILEY-VCH Verlag
Author(s): Ivan Khrapach, Freddie Withers, Thomas H Bointon, Dmitry K Polyushkin, William L Barnes, Saverio Russo, Monica F Craciun.
Sample fabrication: The intercalation process with FeCl3 is performed in vacuum. Both anhydrous FeCl3 powder and the substrate with exfoliated FLG are positioned in different zones inside a glass tube. The tube is pumped down to 2 ×10−4mbar at room temperature for 1 hour to reduce the contamination by water molecules. Subsequently, the FLG and the powder are heated for 7.5 hours at 360° and 310°, respectively. A heating rate of 10°/min is used during the warming and cooling of the two zones. Ohmic contacts are fabricated on FeCl3-FLG by means of electron-beam lithography and lift-off of thermally evaporated chrome/gold bilayer (5/50 nm). We have fabricated FeCl3-FLG on both SiO2/Si and glass substrates and we found no significant differences in their transport properties.