Negatively Charged Nitrogen-Vacancy Centers in a 5 nm Thin 12C Diamond Film
Negatively Charged Nitrogen-Vacancy Centers in a 5 nm Thin 12C Diamond Film
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DOI：
10.1021/nl402286v
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发表时间：
2013-10-01
期刊：
影响因子：
10.8
通讯作者：
Itoh, K. M.
中科院分区：
文献类型：
--
作者：
Ohashi, K.;Rosskopf, T.;Itoh, K. M.
我们报告了通过CVD在5 nm薄的同位素富集（[C-12] 99.99%）金刚石层中成功地引入带负电荷的氮空位（NV-）中心。本方法允许在这样的薄层中形成NV-，即使当表面被氢原子终止时。NV-中心被发现具有T-2之间的自旋相干时间类似于10-100 μ s在室温下。将表面终止改变为氧或氟导致NV-密度略微增加，但T2没有任何显著变化。T-2估计的最小可检测磁场在100 s平均后为3 nT，这足以检测单个质子施加的核磁场。我们通过测量放置在5纳米金刚石膜顶部的类似于10（4）个质子核的波动场来证明纳米级核磁共振的适用性。
We report successful introduction of negatively charged nitrogen-vacancy (NV-) centers in a 5 nm thin, isotopically enriched ([C-12] 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 T-2 similar to 10-100 mu s 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 T-2 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 similar to 10(4) proton nuclei placed on top of the 5 nm diamond film.