XPS and NEXAFS study of fluorine modified TiO2 nano-ovoids reveals dependence of Ti3+ surface population on the modifying agent

Jan-Yves Ruzicka, Faridah Bakar, Lars Thomsen, Bruce Cowie, Campbell McNicoll, Tim Kemmitt, Helen Brand, B Ingham, Gunther Andersson, Vladimir Golovko

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)

    Abstract

    Crystalline titanium dioxide was synthesised under mild conditions by the thermal degradation of peroxotitanic acid in the presence of a number of fluoride-containing surface modifying agents (NH4F, NH 4BF4, NH4PF6, NBu4F, NBu4BF4, NBu4PF6). The resulting materials were characterised by PXRD, SEM, HRTEM, XPS and NEXAFS. Particle phase, size, and surface area were noticeably affected by the choice of surface modifying agent. Both the cation and anion comprising the modifying agent affect the surface Ti3+ population of the materials, with two apparent trends observed: F- > BF4- > PF 6- and NBu4+ > NH 4+. All materials displayed evidence of fluorine doping on their surfaces, although no evidence of bulk doping was observed. This journal is

    Original languageEnglish
    Pages (from-to)20649-20658
    Number of pages10
    JournalRSC Advances
    Volume4
    Issue number40
    DOIs
    Publication statusPublished - 2014

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