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

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 languageEnglish
Pages (from-to)419-423
Number of pages5
JournalSolid State Communications
Volume134
Issue number6
DOIs
Publication statusPublished - 2005 May

Keywords

  • A. Nanotube
  • D. Spin-lattice relaxation
  • E. Nuclear magnetic resonance

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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