Negatively charged nitrogen-vacancy centers in a 5 nm Thin 12C diamond film

K. Ohashi, T. Rosskopf, H. Watanabe, M. Loretz, Y. Tao, R. Hauert, S. Tomizawa, T. Ishikawa, J. Ishi-Hayase, S. Shikata, C. L. Degen, K. M. Itoh

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124 Citations (Scopus)


We report successful introduction of negatively charged nitrogen-vacancy (NV-) centers in a 5 nm thin, isotopically enriched ([12C] = 99.99%) diamond layer by CVD. The present method allows for the formation of NV- in such a thin layer even when the surface is terminated by hydrogen atoms. NV- centers are found to have spin coherence times of between T2 ∼ 10-100 μs at room temperature. Changing the surface termination to oxygen or fluorine leads to a slight increase in the NV- density, but not to any significant change in T2. The minimum detectable magnetic field estimated by this T2 is 3 nT after 100 s of averaging, which would be sufficient for the detection of nuclear magnetic fields exerted by a single proton. We demonstrate the suitability for nanoscale NMR by measuring the fluctuating field from ∼104 proton nuclei placed on top of the 5 nm diamond film.

Original languageEnglish
Pages (from-to)4733-4738
Number of pages6
JournalNano Letters
Issue number10
Publication statusPublished - 2013 Oct 9


  • Diamond
  • chemical vapor deposition
  • isotope engineering
  • magnetometry
  • nitrogen-vacancy center

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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