Photocatalytic activity of nitrogen-doped TiO2-based nanowires: a photo-assisted Kelvin probe force microscopy study

Wu Ming-Chung, Hsueh-Chung Liao, Yu-Cheng Cho, Che-Pu Hsu, Ting-Han Lin, Su Wei-Fang, András Sápi, Ákos Kukovecz, Zoltán Kónya, Andrey Shchukarev, Anjana Sarkar, William Larsson, Jyri-Pekka Mikkola, Melinda Mohl, Géza Tóth, Heli Jantunen, Anna Valtanen, Mika Huuhtanen, Riitta L. Keiski, Krisztián Kordás

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)


    In this study, a set of nitrogen-doped TiO2-based nanomaterials demonstrating photocatalytic activity was developed by combining the efforts of lattice doping and metal nanoparticle decoration and tested for photo-degradation of methylene blue dye by applying solar simulator irradiation. The surface potential shifts of these TiO2-based photocatalytic nanomaterials measured by Kelvin probe force microscope have been used to study the degree of electron generation of the photocatalysts after irradiation and were well correlated with the photocatalytic activity. The nitrogen-doped TiO2 nanowires decorated with Pt nanoparticles can induce obvious electron accumulation and result in a large shift of surface potential. The analysis shows a clear correlation between the surface potential shift and the photodegradation activity. Furthermore, a thorough comparative photocatalytic activity study combined with X-ray photoelectron spectroscopy analysis of the materials-doped with nitrogen under various conditions-reveals that the photocatalytic efficiency of the catalysts is maintained even if the lattice doping is leached e.g., by thermal treatments after doping. By monitoring the surface potential shifts of various TiO2-based photocatalysts by photo-assisted Kelvin probe force microscopy, we obtain a useful tool for developing novel materials with high photocatalytic activity.
    Original languageUndefined/Unknown
    Pages (from-to)2143/1–2143/11
    JournalJournal of Nanoparticle Research
    Issue number1
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

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