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Approaching ballistic transport in suspended graphene Xu Du, Ivan Skachko, Anthony Barker, Eva Y. Andrei
 

Summary: Approaching ballistic transport in suspended graphene
Xu Du, Ivan Skachko, Anthony Barker, Eva Y. Andrei
Department of Physics & Astronomy, Rutgers the State University of New Jersey
Supplementary Information
Contents
A. Graphene preparation
B. Suspending the graphene device
C. Measurements
D. Impact of lead geometry
A. Graphene preparation
Graphene deposition is done using a method similar to the one introduced by the
pioneering work in ref. S1. Prior to graphene deposition, the Si/SiO2 substrates were
baked in forming gas (Ar/H2) at 200C for 1 hour to remove water and organic residue. A
thin foil of highly oriented pyrolytic graphite (neutron detector quality) was peeled from
the bulk material using scotch tape and transferred onto the Si/SiO2 substrate with a fine
pair of tweezers. Pressure was then applied onto the graphite foil using compressed high
purity nitrogen gas through a stainless steel needle, for ~5 seconds. The foil was then
removed from the substrate and the substrate was carefully checked under an optical
microscope for candidates of single layer graphene. This process is repeated until a few
graphene flakes can be identified. The sample was then immediately coated with PMMA

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics