Observation of anisotropy in thermal conductivity of individual single-crystalline bismuth nanowires

Jong Wook Roh; Kedar Hippalgaonkar; Jin Hee Ham; Renkun Chen; Ming Zhi Li; Peter Ercius; Arun Majumdar; Woochul Kim; Wooyoung Lee

doi:10.1021/nn200474d

Observation of anisotropy in thermal conductivity of individual single-crystalline bismuth nanowires

Jong Wook Roh, Kedar Hippalgaonkar, Jin Hee Ham, Renkun Chen, Ming Zhi Li, Peter Ercius, Arun Majumdar, Woochul Kim, Wooyoung Lee

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73 Scopus citations

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 [1̄02] 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.

Original language	English
Pages (from-to)	3954-3960
Number of pages	7
Journal	ACS Nano
Volume	5
Issue number	5
DOIs	https://doi.org/10.1021/nn200474d
State	Published - 24 May 2011

Keywords

Anisotropy
Bismuth
Nanowires
Size effect
Thermal conductivity

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10.1021/nn200474d

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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 [{\=1}02] 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.",

keywords = "Anisotropy, Bismuth, Nanowires, Size effect, Thermal conductivity",

author = "Roh, {Jong Wook} and Kedar Hippalgaonkar and Ham, {Jin Hee} and Renkun Chen and Li, {Ming Zhi} and Peter Ercius and Arun Majumdar and Woochul Kim and Wooyoung Lee",

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T1 - Observation of anisotropy in thermal conductivity of individual single-crystalline bismuth nanowires

AU - Roh, Jong Wook

AU - Hippalgaonkar, Kedar

AU - Ham, Jin Hee

AU - Chen, Renkun

AU - Li, Ming Zhi

AU - Ercius, Peter

AU - Majumdar, Arun

AU - Kim, Woochul

AU - Lee, Wooyoung

PY - 2011/5/24

Y1 - 2011/5/24

N2 - 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 [1̄02] 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.

AB - 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 [1̄02] 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.

KW - Anisotropy

KW - Bismuth

KW - Nanowires

KW - Size effect

KW - Thermal conductivity

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U2 - 10.1021/nn200474d

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SP - 3954

EP - 3960

JO - ACS Nano

JF - ACS Nano

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ER -

Observation of anisotropy in thermal conductivity of individual single-crystalline bismuth nanowires

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Keywords

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