Nuclear magnetic resonance study of ultrananocrystalline diamonds

Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

“…The preparation of the aqueous SNBD colloidal solution that is characterized by a narrow particle size distribution pattern with an average particle size value ~5 nm was described in detail elsewhere [23,24]. ND#1 powder was produced by drying of stable aqueous dispersions of SNBD at room temperature.…”

Understanding structure and porosity of nanodiamond-derived carbon onions

“…Nanodiamonds [28] are an intriguing precursor for the gram-scale synthesis [29] of control over the resulting structure and properties via thermal annealing [27]. The typical size of nanodiamonds used for OLC synthesis is around 5 nm [28] with dangling bonds on the surface that are typically stabilized by functional groups, mostly carboxyls [28,30], and locally terminated by a thin layer of sp 2 -hybridized carbon [31][32][33]. These two surface features contribute to the notorious aggregation of individual nanodiamond particles forming clusters in the range of tens to hundreds of nanometer [34]: individual grains are engulfed by thin layers of graphitic carbon or covalently linked by bridging functional groups [28,34], leading to the formation of so-called tight agglomerates.…”

Investigation of Surface Magnetic Noise by Shallow Spins in Diamond

“…Thus, the presence of magnetic surface states seems to be common with many materials. In diamond, evidence for magnetic surface states has been found both for bulk, single crystalline surfaces [13,25,26] and for nanocrystals [20,21,[27][28][29]. Electron paramagnetic resonance and optically detected magnetic resonance have been used to indirectly estimate a density ρ A ¼ 0.1-10μ B =nm 2 and characteristic correlation time τ c ¼ 10…”