ODMR active bright sintered detonation nanodiamonds obtained without irradiation

We present the results of study structure and composition microcrystalline diamonds obtained by high-pressure high temperature sintering detonation nanodiamond particles. Using optical detected magnetic resonance method, photoluminescence spectroscopy Raman we found significantly differ from initial nanodiamonds can be compared to quality diamonds. Monocrystals method oriented attachment have dimensions up tens microns, possess habitus high-quality diamonds, do not contain metal catalysts in lattice structure. In those crystals, presence optically active nitrogen impurities crystal is observed. particular, there a bright nitrogen-vacancy defects. They are characterized which shows that spin properties single crystals correspond natural surpass synthetic graphite catalysts, followed irradiation annealing obtain defects diamond lattice. The allows us consider them as potential candidates quantum magnetometry. For this purpose, possibility simple way improve AFM probe fixing particle on its tip demonstrated. Keywords: nanodiamond, HPHT sintering, ODMR, crystalline, photoluminescence,