TY - JOUR
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
N1 - Funding Information:
This work was supported by the Center for Nanoscale Mechatronics and Manufacturing.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
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
AN - SCOPUS:15544387356
SN - 0038-1098
VL - 134
SP - 419
EP - 423
JO - Solid State Communications
JF - Solid State Communications
IS - 6
ER -