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Joohoon Kang, Jong Wook Roh, Wooyoung Shim, Jinhee Ham, Jin-Seo Noh and Wooyoung Lee Reduction of Lattice Thermal Conductivity in Single Bi-Te Core/Shell Nanowires with Rough Interface Advanced Materials 23

Article first published online: 14 JUN 2011 | DOI: 10.1002/adma.201101460

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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.

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