title: Observation of anisotropy in thermal conductivity of individual single-crystalline bismuth nanowires.
abstract: The thermal conductivity of individual single-crystalline Bi nanowires grown by the on-film formation of nanowires (ON-OFF) has been investigated. We observed that the thermal conductivity of single-crystalline Bi nanowires is highly anisotropic. Thermal conductivity of nanowires (diameter ∼100 nm) in the off-axis [102] and [110] directions exhibits a difference of ∼7.0 W/m·K. The thermal conductivity in both growth directions is diameter-dependent, which indicates that thermal transport through the individual Bi nanowires is limited by boundary scattering of both electrons and phonons. This huge anisotropy in thermal conductivities of Bi nanowires suggests the importance of direction-dependent characterization of charge, thermal transport, and thermoelectric properties of Bi nanowires.
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, 262 Seongsanno, Seoul 120-749, Korea.
authors.forename: Jong Wook
authors.initials: JW
authors.lastname: Roh
authors.forename: Kedar
authors.initials: K
authors.lastname: Hippalgaonkar
authors.forename: Jin Hee
authors.initials: JH
authors.lastname: Ham
authors.forename: Renkun
authors.initials: R
authors.lastname: Chen
authors.forename: Ming Zhi
authors.initials: MZ
authors.lastname: Li
authors.forename: Peter
authors.initials: P
authors.lastname: Ercius
authors.forename: Arun
authors.initials: A
authors.lastname: Majumdar
authors.forename: Woochul
authors.initials: W
authors.lastname: Kim
authors.forename: Wooyoung
authors.initials: W
authors.lastname: Lee
mesh_terms: D016880:Anisotropy; D001729:Bismuth / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D013814:Thermal Conductivity
chemical_list: D046911:Macromolecular Substances; D001729:Bismuth