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首页> 美国政府科技报告 >Investigation of TiO(sub 2) nanoparticles with XAS and scattering (SANS and SAXS) techniques
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Investigation of TiO(sub 2) nanoparticles with XAS and scattering (SANS and SAXS) techniques

机译：用Xas和散射（saNs和saXs）技术研究TiO（sub 2）纳米粒子

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Semiconductor assisted photocatalysis that is based primarily on TiO(sub 2) has proven to be a promising technology for a variety of applications such as removal of organic and inorganic pollutants, metal ion reduction, or chemical syntheses. Surface modification of titanium dioxide nanoparticles can result in the enhanced kinetic and redox characteristics of this semiconductor. A variety of diagnostic techniques were used in order to understand the unique nature of 45 (angstrom) TiO(sub 2) nanoparticles. Compared to bulk material, a shorter Ti-O bond distance and a decrease of the coordination number of surface Ti sites were found using XAS. IR spectroscopy suggests that upon surface modification with (alpha) mercaptocarboxylic acids surface Ti(IV) atoms become coordinated with five-membered ring formation to reestablish octahedral coordination. This results in the formation of a charge transfer complex with an optical absorption threshold at 520 nm. A rod-like, two-dimensional self-assembly of thiolactate modified 45 (angstrom) TiO(sub 2) nanoclusters in water was detected by small angle neutron scattering (SANS).

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