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Reduction of Lattice Thermal Conductivity in Single Bi‐Te Core/Shell Nanowires with Rough Interface
Author(s) -
Kang Joohoon,
Roh Jong Wook,
Shim Wooyoung,
Ham Jinhee,
Noh JinSeo,
Lee Wooyoung
Publication year - 2011
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201101460
Subject(s) - nanowire , materials science , thermal conductivity , lattice (music) , shell (structure) , sputtering , phonon , conductivity , condensed matter physics , thermal , nanotechnology , composite material , thin film , thermodynamics , chemistry , physics , acoustics
The role of the interface roughness of Bi‐Te core/shell nanowires is reported in reducing lattice thermal conductivity , which are prepared by on‐film formation of nanowire (OFF‐ON) that is capable of growing high‐quality single‐crystalline Bi nanowires, and by the subsequent sputtering of Te onto the Bi nanowires. The rough interface Bi‐Te core/shell nanowires exhibit lower thermal conductivities than that of smooth interface counterparts, while electrical conductivities for these two types of nanowires are similar. We propose that the rough interface plays a pivotal role in suppressing phonon transport, which in turn, reduces thermal conductivity significantly.