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

Ming Chung Wu, Hsueh Chung Liao, Yu Cheng Cho, Che Pu Hsu, Ting Han Lin, Wei Fang Su, András Sápi, Á. Kukovecz, Z. 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 journalArticle

11 Citations (Scopus)

Abstract

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. Graphical Abstract: 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.[Figure not available: see fulltext.]

Original languageEnglish
Article number2143
JournalJournal of Nanoparticle Research
Volume16
Issue number1
DOIs
Publication statusPublished - Jan 2014

Fingerprint

TiO2
Kelvin
Nanowires
Surface potential
Surface Potential
Microscopy
Nitrogen
Microscopic examination
nanowires
Probe
Photodegradation
Doping (additives)
Photocatalysts
microscopy
Nanostructured materials
nitrogen
probes
Photocatalyst
Irradiation
Nanomaterials

Keywords

  • Kelvin probe force microscopy
  • Nanostructured catalyst
  • Photocatalyst
  • Photodegradation
  • Surface potential
  • TiO

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Modelling and Simulation
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering

Cite this

Photocatalytic activity of nitrogen-doped TiO2-based nanowires : A photo-assisted Kelvin probe force microscopy study. / Wu, Ming Chung; Liao, Hsueh Chung; Cho, Yu Cheng; Hsu, Che Pu; Lin, Ting Han; Su, Wei Fang; Sápi, András; Kukovecz, Á.; Kónya, Z.; Shchukarev, Andrey; Sarkar, Anjana; Larsson, William; Mikkola, Jyri Pekka; Mohl, Melinda; Tóth, Géza; Jantunen, Heli; Valtanen, Anna; Huuhtanen, Mika; Keiski, Riitta L.; Kordás, Krisztián.

In: Journal of Nanoparticle Research, Vol. 16, No. 1, 2143, 01.2014.

Research output: Contribution to journalArticle

Wu, MC, Liao, HC, Cho, YC, Hsu, CP, Lin, TH, Su, WF, Sápi, A, Kukovecz, Á, Kónya, Z, Shchukarev, A, Sarkar, A, Larsson, W, Mikkola, JP, Mohl, M, Tóth, G, Jantunen, H, Valtanen, A, Huuhtanen, M, Keiski, RL & Kordás, K 2014, 'Photocatalytic activity of nitrogen-doped TiO2-based nanowires: A photo-assisted Kelvin probe force microscopy study', Journal of Nanoparticle Research, vol. 16, no. 1, 2143. https://doi.org/10.1007/s11051-013-2143-y
Wu, Ming Chung ; Liao, Hsueh Chung ; Cho, Yu Cheng ; Hsu, Che Pu ; Lin, Ting Han ; Su, Wei Fang ; Sápi, András ; Kukovecz, Á. ; Kónya, Z. ; Shchukarev, Andrey ; Sarkar, Anjana ; Larsson, William ; Mikkola, Jyri Pekka ; Mohl, Melinda ; Tóth, Géza ; Jantunen, Heli ; Valtanen, Anna ; Huuhtanen, Mika ; Keiski, Riitta L. ; Kordás, Krisztián. / Photocatalytic activity of nitrogen-doped TiO2-based nanowires : A photo-assisted Kelvin probe force microscopy study. In: Journal of Nanoparticle Research. 2014 ; Vol. 16, No. 1.
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AU - Lin, Ting Han

AU - Su, Wei Fang

AU - Sápi, András

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AU - Kónya, Z.

AU - Shchukarev, Andrey

AU - Sarkar, Anjana

AU - Larsson, William

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AU - Mohl, Melinda

AU - Tóth, Géza

AU - Jantunen, Heli

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