In this paper, samples containing gold nanoparticles (NPs) distributed in different optically transparent media have been synthesized and characterized. A liquid (aqueous) and a solid (porous silicate glass and polymer (polyvinylpyrrolidone)) media were used. The samples obtained were characterized by optical spectroscopy and electron microscopy. The position of plasmon resonance band was analyzed depending on the dielectric constant of the medium.
Keywords: gold nanoparticles, colloidal solution, polymer, porous glass
In the present work, a study was made of the properties of a photocatalyst-adsorbent based on metal oxide, which was titanium dioxide (TiO2). The photodegradation activity of two organic dyes under the action of light was analyzed. The effect of the phase composition of the photocatalyst was compared on the example of three modifications of TiO2 - rutile, anatase and their mixture.
Keywords: TiO2, photocatalysis, metal oxide, dyes
In the present work the mesoporous transparent silica monolith with surface area of 650 m2/g was obtained by sol-gel method. Introduction of gold salt into reaction mixture allowed to form micro- and nanoparticles of gold in monolith's volume by rising the temperature. The obtained composite was stabilized by activation in air at 600 °C. It is an useful model for investigation of optical and catalytical properties of noble metal particles.
Keywords: gold nanoparticles, sol-gel synthesis, porous glass