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Photocatalytic Properties of WO sub(3)/TiO sub(2) Core/Shell Nanofibers prepared by Electrospinning and Atomic Layer Deposition

Chemical vapor deposition, 2013-06, Vol.19 (4-6), p.149-155 [Peer Reviewed Journal]

ISSN: 0948-1907 ;EISSN: 1521-3862 ;DOI: 10.1002/cvde.201207037

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  • Title:
    Photocatalytic Properties of WO sub(3)/TiO sub(2) Core/Shell Nanofibers prepared by Electrospinning and Atomic Layer Deposition
  • Author: Szilagyi, Imre Miklos ; Santala, Eero ; Heikkilae, Mikko ; Pore, Viljami ; Kemell, Marianna ; Nikitin, Timur ; Teucher, Georg ; Firkala, Tamas ; Khriachtchev, Leonid ; Raesaenen, Markku ; Ritala, Mikko ; Leskelae, Markku
  • Subjects: Deposition
  • Is Part Of: Chemical vapor deposition, 2013-06, Vol.19 (4-6), p.149-155
  • Description: Core WO sub(3) nanofibers (140-300nm in diameter, several hundred mu m long) are made by a novel, water-based electrospinning process using ammonium metatungstate (AMT) and polyvinylpyrrolidone (PVP) as precursors. TiO sub(2) shells (1.5-20nm) are grown by atomic layer deposition (ALD) using TiCl sub(4) and water at 250 degree C. The WO sub(3)/TiO sub(2) composite fibers are analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM)-energy dispersive X-ray (EDX), transmission electron microscopy (TEM), Raman spectroscopy (RS), UV-Vis spectroscopy, and X-ray photoelectron spectroscopy (XPS). The optimal photocatalytic conversion under visible light is reached by the WO sub(3)/1.5nm TiO sub(2) nanofibers, which have higher activity compared to bare WO sub(3) and Degussa TiO sub(2). Thicker TiO sub(2) layers fill the pores of the nanowires and reduce the specific surface area, weakening the photocatalytic activity. TiO sub(2) thin films (1.5-20nm) are grown by ALD on electrospun WO sub(3) nanofibers. The WO sub(3)/1.5nm TiO sub(2) composite nanofiber has the highest photocatalytic activity, and it is a better photocatalyst under visible light when compared to bare WO sub(3) and Degussa TiO sub(2).
  • Language: English
  • Identifier: ISSN: 0948-1907
    EISSN: 1521-3862
    DOI: 10.1002/cvde.201207037
  • Source: Alma/SFX Local Collection
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