11B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method

Chang Hoon Lee; Seong Hun Park; Jae Kap Jung; Kwon Sang Ryu; Seung Hoon Nahm; Joon Kim; Ying Chen

doi:10.1016/j.ssc.2005.01.052

¹¹B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method

Chang Hoon Lee, Seong Hun Park, Jae Kap Jung^*, Kwon Sang Ryu, Seung Hoon Nahm, Joon Kim, Ying Chen

^*Corresponding author for this work

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

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Abstract

We reported ¹¹B nuclear magnetic resonance studies of boron nitride (BN) nanotubes prepared by mechano-thermal route. The NMR lineshape obtained at 192.493 MHz (14.7 T) was fitted with two Gaussian functions, and the ¹¹B nuclear magnetization relaxations were satisfied with the stretched-exponential function, exp[-(t/T1)(D+1)/6] (D: space dimension) at all temperatures. In addition, the temperature dependence of spin-lattice relaxation rates was well described by T1-1=aT (a: constant, T: temperature) and could be understood in terms of direct phonon process. All the ¹¹BNMR results were explained by considering the inhomogeneous distribution of the paramagnetic metal catalysts, such as α-Fe, Fe-N, and Fe₂ B, that were incorporated during the process of high-energy ball milling of boron powder and be synthesized during subsequent thermal annealing. X-ray powder diffraction as well as electron paramagnetic resonance (EPR) on BN nanotubes were also conducted and the results obtained supported these conclusions.

Original language	English
Pages (from-to)	419-423
Number of pages	5
Journal	Solid State Communications
Volume	134
Issue number	6
DOIs	https://doi.org/10.1016/j.ssc.2005.01.052
Publication status	Published - May 2005

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@article{c655b088dd404067aad68ee5c23a8a1b,

title = "11B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method",

abstract = "We reported 11B nuclear magnetic resonance studies of boron nitride (BN) nanotubes prepared by mechano-thermal route. The NMR lineshape obtained at 192.493 MHz (14.7 T) was fitted with two Gaussian functions, and the 11B nuclear magnetization relaxations were satisfied with the stretched-exponential function, exp[-(t/T1)(D+1)/6] (D: space dimension) at all temperatures. In addition, the temperature dependence of spin-lattice relaxation rates was well described by T1-1=aT (a: constant, T: temperature) and could be understood in terms of direct phonon process. All the 11BNMR results were explained by considering the inhomogeneous distribution of the paramagnetic metal catalysts, such as α-Fe, Fe-N, and Fe2 B, that were incorporated during the process of high-energy ball milling of boron powder and be synthesized during subsequent thermal annealing. X-ray powder diffraction as well as electron paramagnetic resonance (EPR) on BN nanotubes were also conducted and the results obtained supported these conclusions.",

keywords = "A. Nanotube, D. Spin-lattice relaxation, E. Nuclear magnetic resonance",

author = "Lee, {Chang Hoon} and Park, {Seong Hun} and Jung, {Jae Kap} and Ryu, {Kwon Sang} and Nahm, {Seung Hoon} and Joon Kim and Ying Chen",

year = "2005",

month = may,

doi = "10.1016/j.ssc.2005.01.052",

language = "English",

volume = "134",

pages = "419--423",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd.",

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T1 - 11B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method

AU - Lee, Chang Hoon

AU - Park, Seong Hun

AU - Jung, Jae Kap

AU - Ryu, Kwon Sang

AU - Nahm, Seung Hoon

AU - Kim, Joon

AU - Chen, Ying

PY - 2005/5

Y1 - 2005/5

N2 - We reported 11B nuclear magnetic resonance studies of boron nitride (BN) nanotubes prepared by mechano-thermal route. The NMR lineshape obtained at 192.493 MHz (14.7 T) was fitted with two Gaussian functions, and the 11B nuclear magnetization relaxations were satisfied with the stretched-exponential function, exp[-(t/T1)(D+1)/6] (D: space dimension) at all temperatures. In addition, the temperature dependence of spin-lattice relaxation rates was well described by T1-1=aT (a: constant, T: temperature) and could be understood in terms of direct phonon process. All the 11BNMR results were explained by considering the inhomogeneous distribution of the paramagnetic metal catalysts, such as α-Fe, Fe-N, and Fe2 B, that were incorporated during the process of high-energy ball milling of boron powder and be synthesized during subsequent thermal annealing. X-ray powder diffraction as well as electron paramagnetic resonance (EPR) on BN nanotubes were also conducted and the results obtained supported these conclusions.

AB - We reported 11B nuclear magnetic resonance studies of boron nitride (BN) nanotubes prepared by mechano-thermal route. The NMR lineshape obtained at 192.493 MHz (14.7 T) was fitted with two Gaussian functions, and the 11B nuclear magnetization relaxations were satisfied with the stretched-exponential function, exp[-(t/T1)(D+1)/6] (D: space dimension) at all temperatures. In addition, the temperature dependence of spin-lattice relaxation rates was well described by T1-1=aT (a: constant, T: temperature) and could be understood in terms of direct phonon process. All the 11BNMR results were explained by considering the inhomogeneous distribution of the paramagnetic metal catalysts, such as α-Fe, Fe-N, and Fe2 B, that were incorporated during the process of high-energy ball milling of boron powder and be synthesized during subsequent thermal annealing. X-ray powder diffraction as well as electron paramagnetic resonance (EPR) on BN nanotubes were also conducted and the results obtained supported these conclusions.

KW - A. Nanotube

KW - D. Spin-lattice relaxation

KW - E. Nuclear magnetic resonance

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U2 - 10.1016/j.ssc.2005.01.052

DO - 10.1016/j.ssc.2005.01.052

M3 - Article

SN - 0038-1098

VL - 134

SP - 419

EP - 423

JO - Solid State Communications

JF - Solid State Communications

IS - 6

ER -

¹¹B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method

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