title: Direct nanoscale imaging of ballistic and diffusive thermal transport in graphene nanostructures.
abstract: We report direct imaging of nanoscale thermal transport in single and few-layer graphene with approximately 50 nm lateral resolution using high vacuum scanning thermal microscopy. We observed increased heat transport in suspended graphene where heat is conducted by ballistic phonons, compared to adjacent areas of supported graphene, and observed decreasing thermal conductance of supported graphene with increased layer number. Our nanothermal images suggest a mean-free-path of thermal phonons in supported graphene below 100 nm.
authors.affiliation: Physics Department, Lancaster University, Lancaster, LA1 4YB, United Kingdom.
authors.forename: Manuel E
authors.initials: ME
authors.lastname: Pumarol
authors.forename: Mark C
authors.initials: MC
authors.lastname: Rosamond
authors.forename: Peter
authors.initials: P
authors.lastname: Tovee
authors.forename: Michael C
authors.initials: MC
authors.lastname: Petty
authors.forename: Dagou A
authors.initials: DA
authors.lastname: Zeze
authors.forename: Vladimir
authors.initials: V
authors.lastname: Falko
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Kolosov
mesh_terms: D004735:Energy Transfer; D006108:Graphite / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013814:Thermal Conductivity
chemical_list: D006108:Graphite