Controlled synthesis of MoO_3 microcrystals by subsequent calcination of hydrothermally grown pyrazine-MoO_3 nanorod hybrids and their photodecomposition properties

摘要

We present our results on successful synthesis of pyrazine-MoO_3 nanorod hybrids by using pyrazine and MoO_3 nanorods. On the first stage, MoO_3 nanorods were grown hydrothermally and, on the second stage, their mixture with pyrazine was again involved in a hydrothermal reaction to produce organic-inorganic hybrids. To understand the growth mechanism of the hybrids we varied time and temperature of the hydrothermal process. Intercalation of pyrazine was confirmed through X-ray diffraction analysis, X-ray photoelectron spectroscopy, X-ray emission spectroscopy, scanning electron microscopy methods. Upon calcinations, pyrazine was deintercalated, i.e. removed from the MoO_3 hybrid system, and the MoO_3 nanorods were found to bind together resulting in formation of MoO_3 microslabs with increased surface area. Photodecomposition performance of the MoO_3 nanorods, pyrazine-MoO_3 hybrids and MoO_3 microcrystals was studied against Procion Red MX-5B textile dye. A high photodecomposition performance was found to decrease when going from MoO_3 nanorods to MoO_3 microcrystal and, further, to pyrazine-MoO_3 hybrids.