Scalable route towards superior photoresponse of UV laser-treated TiO2 nanotubes - Publication - MOST Wiedzy

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Scalable route towards superior photoresponse of UV laser-treated TiO2 nanotubes

Abstract

Titanium dioxide nanotubes gain considerable attention as a photoactive material due to chemical stability, photocorrosion resistance or low cost manufacturing method. This work presents scalable pulsed laser modification of TiO2 nanotubes resulting in enhanced photoactivity in a system equipped with motorized table which allows for modifications of both precisely selected and any-large sample area. Images obtained from scanning electron microscopy along with Raman and UV-vis spectra of laser-treated samples in a good agreement indicate a presence of additional laser-induced shallow states within band gap via degradation of crystalline structure. However, XPS spectra revealed no change of chemical nature of the modified samples surface. Photoelectrochemical measurements demonstrate superior photoresponse of laser-treated samples up to 1.45-fold for energy beam fluence of 40 mJ/cm2 comparing to calcine one. According to the obtained results optimal processing parameters were captured. Mott-Schottky analysis obtained from impedance measurements indicates enormous (over an order of magnitude) increase of donor density along with +0.74 V positive shift of flat band potential. Such changes in electronic structure are most likely responsible for enhanced photoactivity. Thus, the elaborated method of laser nanostructuring can be successfully employed to large scale modification of titania nanotubes resulting in their superior photoactivity. According to that the results of our work provide a contribution to wider applications of materials based on titania nanotubes.

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Details

Category:
Articles
Type:
artykuły w czasopismach dostępnych w wersji elektronicznej [także online]
Published in:
ACS Applied Materials & Interfaces pages 1 - 29,
ISSN: 1944-8244
Language:
English
Publication year:
2019
Bibliographic description:
Haryński Ł., Grochowska K., Karczewski J., Ryl J., Katarzyna S., Scalable route towards superior photoresponse of UV laser-treated TiO2 nanotubes, ACS Applied Materials & Interfaces, 2019,10.1021/acsami.9b19206
DOI:
Digital Object Identifier (open in new tab) 10.1021/acsami.9b19206
Verified by:
Gdańsk University of Technology

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