Thiol-capped ZnO nanowire/nanotube arrays with tunable magnetic properties at room temperature

Su Zi Deng; Hai Ming Fan; Miao Wang; Min Rui Zheng; Jia Bao Yi; Rong Qin Wu; Hui Ru Tan; Chorng Haur Sow; Jun Ding; Yuan Ping Feng; Kian Ping Loh

doi:10.1021/nn901353x

Thiol-capped ZnO nanowire/nanotube arrays with tunable magnetic properties at room temperature

Su Zi Deng, Hai Ming Fan^*, Miao Wang, Min Rui Zheng, Jia Bao Yi, Rong Qin Wu, Hui Ru Tan, Chorng Haur Sow, Jun Ding, Yuan Ping Feng, Kian Ping Loh

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

78 Scopus citations

Abstract

The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)- aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher Ms of 166 μemu cm ^-2 has been found in NTs compared to NWs (36 μemu cm ^-2) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.

Original language	English
Pages (from-to)	495-505
Number of pages	11
Journal	ACS Nano
Volume	4
Issue number	1
DOIs	https://doi.org/10.1021/nn901353x
State	Published - 26 Jan 2010
Externally published	Yes

Keywords

Magnetic properties
Semiconductors
Thiol
ZnO nanotubes and nanowires

ASJC Scopus subject areas

General Materials Science
General Engineering
General Physics and Astronomy

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@article{d864ca631b6049c0b858acb6cbe9e044,

title = "Thiol-capped ZnO nanowire/nanotube arrays with tunable magnetic properties at room temperature",

abstract = "The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)- aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher Ms of 166 μemu cm -2 has been found in NTs compared to NWs (36 μemu cm -2) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.",

keywords = "Magnetic properties, Semiconductors, Thiol, ZnO nanotubes and nanowires",

author = "Deng, \{Su Zi\} and Fan, \{Hai Ming\} and Miao Wang and Zheng, \{Min Rui\} and Yi, \{Jia Bao\} and Wu, \{Rong Qin\} and Tan, \{Hui Ru\} and Sow, \{Chorng Haur\} and Jun Ding and Feng, \{Yuan Ping\} and Loh, \{Kian Ping\}",

year = "2010",

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doi = "10.1021/nn901353x",

language = "English",

volume = "4",

pages = "495--505",

journal = "ACS Nano",

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T1 - Thiol-capped ZnO nanowire/nanotube arrays with tunable magnetic properties at room temperature

AU - Deng, Su Zi

AU - Fan, Hai Ming

AU - Wang, Miao

AU - Zheng, Min Rui

AU - Yi, Jia Bao

AU - Wu, Rong Qin

AU - Tan, Hui Ru

AU - Sow, Chorng Haur

AU - Ding, Jun

AU - Feng, Yuan Ping

AU - Loh, Kian Ping

PY - 2010/1/26

Y1 - 2010/1/26

N2 - The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)- aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher Ms of 166 μemu cm -2 has been found in NTs compared to NWs (36 μemu cm -2) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.

AB - The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)- aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher Ms of 166 μemu cm -2 has been found in NTs compared to NWs (36 μemu cm -2) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.

KW - Magnetic properties

KW - Semiconductors

KW - Thiol

KW - ZnO nanotubes and nanowires

UR - https://www.scopus.com/pages/publications/75749117907

U2 - 10.1021/nn901353x

DO - 10.1021/nn901353x

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AN - SCOPUS:75749117907

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VL - 4

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JO - ACS Nano

JF - ACS Nano

IS - 1

ER -

Thiol-capped ZnO nanowire/nanotube arrays with tunable magnetic properties at room temperature

Abstract

Keywords

ASJC Scopus subject areas

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