ИСТИНА

The oxidation of CNT was carried out in 8 М H2SO4/8 M HNO3 mixture at 60 С in sonicating bath during different amounts of time. It was found that increase of oxidation time leads to the increase of dispersability of multiwall carbon nanotubes (MWCNT) in water (up to 0.2 mg/ml) and to decrease of their conductivity (approx. in one order of magnitude). IR-spectroscopy shows the presence of carboxyl and carbonyl groups on the surface of modified MWCNT. TEM analysis of modified MWCNT shows that increase of oxidation time leads to the decrease of MWCNT length and Raman spectroscopy investigations indicates that the amount of MNT surface defects doesn’t change with the increase of oxidation time. In order to prepare silver nanoparticles dispersions stabilized with modified MWCNT two approaches were used. The one of them consists from reducing of silver ions by sodium borohydride in the presence of modified MWCNT. However in was found that such approach leads to aggregation of silver nanoparticles. The second approach consists from addition of modified MWCNT to preliminary prepared silver nanoparticle dispersion and leads to formation of silver nanoparticles dispersion stabilized by modified MWCNT persistent during several monthes.