title: Thermal transport in three-dimensional foam architectures of few-layer graphene and ultrathin graphite.
abstract: At a very low solid concentration of 0.45 ± 0.09 vol %, the room-temperature thermal conductivity (κ(GF)) of freestanding graphene-based foams (GF), comprised of few-layer graphene (FLG) and ultrathin graphite (UG) synthesized through the use of methane chemical vapor deposition on reticulated nickel foams, was increased from 0.26 to 1.7 W m(-1) K(-1) after the etchant for the sacrificial nickel support was changed from an aggressive hydrochloric acid solution to a slow ammonium persulfate etchant. In addition, κ(GF) showed a quadratic dependence on temperature between 11 and 75 K and peaked at about 150 K, where the solid thermal conductivity (κ(G)) of the FLG and UG constituents reached about 1600 W m(-1) K(-1), revealing the benefit of eliminating internal contact thermal resistance in the continuous GF structure.
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States.
authors.forename: Michael Thompson
authors.initials: MT
authors.lastname: Pettes
authors.forename: Hengxing
authors.initials: H
authors.lastname: Ji
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff
authors.forename: Li
authors.initials: L
authors.lastname: Shi
mesh_terms: D003460:Crystallization / Q000379:methods*; D004735:Energy Transfer; D005740:Gases / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013814:Thermal Conductivity
chemical_list: D005740:Gases; D008567:Membranes, Artificial; D006108:Graphite