ИСТИНА

Despite the many hypotheses, at present there is no single theory to explain the nature of the fluorescence of detonation nanodiamonds (NDs). This work is devoted to study of the effect of hydrogen bonding on the fluorescent properties of detonation NDs. Suspensions of detonation NDs modified by hydroxyl groups in various solvents: water, methanol, DMSO - were studied. Various properties of the solvents, as well as change of the temperature provided change of hydrogen bonds strength in the suspensions around the nanoparticles. The studies were carried out by optical and correlation spectroscopy. With the help of Raman and fluorescence spectroscopy, substantial influence of the interactions of detonation ND-COOH with different solvent molecules in suspensions on the properties of each other was found. As a result of comparative analysis of Raman and fluorescence spectra of suspensions of ND-COOH in water, methanol and DMSO, it was found that more intense fluorescence of nanoparticles in suspensions corresponds to weaker hydrogen bonding between NDs and solvent molecules. The authors explain the revealed effects by different shift of energy levels of electronexcited states of surface groups of nanoparticles under the influence of hydrogen bonds.