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Study of diamond film by dynamic nuclear polarization-enhanced13C nuclear magnetic resonance spectroscopy |
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| Authors: | K. Fang J. Zhou H. Lei C. Ye R. Zhan H. Fu X. Zhang E. Yan S. Liu |
| Affiliation: | 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071, Wuhan, People’s Republic of China 2. Graduate School, Chinese Academy of Sciences, Beijing, China 3. Department of Chemistry, Guizhou Normal University, Guiyang, China 4. Department of Modern Physics, University of Science and Technology of China, Hefei, China 5. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha, China |
| Abstract: | Three chemical vapor deposited diamond films were studied by dynamic nuclear polarization (DNP)-enhanced high-resolution solid-state13C nuclear magnetic resonance (NMR) spectroscopy. Enhanced13C direct-polarization spectra of diamond films were obtained by irradiating the samples with microwaves at or near electron spin resonance Larmor frequency of carbon center free radicals. No NMR signal for sp2 hybridized carbons could be observed. From the curve of the DNP enhancement as a function of frequency, it is found that the dominant DNP mechanism is the solid-state effect. The13C cross-polarization spectrum, which is an evidence for existence of the proton defect in the lattice of diamond films, is much broader than the13C single pulse spectrum. The reason is discussed shortly. |
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