High-pressure, high-temperature sintering of detonation nanodiamonds is used to fabricate material containing high concentrations of nitrogen-vacancy (NV) centers, without post or prior irradiation of the samples. The concentration of the NV centers in the sintered nanodiamond clusters is up to 104 ppm (1%) and is three orders of magnitude higher than any reported so far.
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Baranov et al. (2011) studied this question.
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