N-Doped TiO2 Photocatalyst Coatings Synthesized by a Cold Atmospheric Plasma
| Autor: | Basab Chattopadhyay, François Reniers, Alp Ozkan, Alisson Tromont, Claude Poleunis, Arnaud Delcorte, Herman Terryn, Kitty Baert, Marie-Paule Delplancke-Ogletree, Yves Geerts, Rony Snyders, Qianqian Chen |
|---|---|
| Přispěvatelé: | UCL - SST/IMCN/BSMA - Bio and soft matter, Materials and Chemistry, Electrochemical and Surface Engineering, Materials and Surface Science & Engineering, Vrije Universiteit Brussel |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physique de l'état condense [struct. électronique
etc.] Materials science Atmospheric-pressure plasma 02 engineering and technology Physique de l'état condense [struct. propr. thermiques etc.] 010402 general chemistry 01 natural sciences chemistry.chemical_compound Materials Science(all) Electrochemistry Physique des surfaces General Materials Science Spectroscopie [état condense] Physique de l'état condense [supraconducteur] Spectroscopy Electrochimie hautes et basses températures Doping technology industry and agriculture Tio2 photocatalyst Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Spectroscopie [électromagnétisme optique acoustique] Métallurgie et mines chemistry Chemical engineering Titanium dioxide Photocatalysis 0210 nano-technology Visible spectrum |
| Zdroj: | Langmuir, Vol. 35, no.22, p. 7161-7168 (2019) Langmuir, 35 (22 |
| Popis: | This work presents a simple, fast (20 min treatment), inexpensive, and highly efficient method for synthesizing nitrogen-doped titanium dioxide (N-TiO2) as an enhanced visible light photocatalyst. In this study, N-TiO2 coatings were fabricated by atmospheric pressure dielectric barrier discharge (DBD) at room temperature. The composition and the chemical bonds of the TiO2 and N-TiO2 coatings were characterized by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectroscopy (ToF-SIMS). The results indicate that the nitrogen element has doped the TiO2 lattice, which was further confirmed by Raman spectroscopy and grazing incidence X-ray diffraction (GIXRD). The doping mechanism was investigated using OES to study the plasma properties under different conditions. It suggests that the NH radicals play a key role in doping TiO2. The concentration of nitrogen in the N-TiO2 coatings can be controlled by changing the concentration of NH3 in the plasma or the applied power to adjust the concentration of NH radicals in the plasma. The band gap of N-TiO2 was reduced after NH3/Ar plasma treatment from 3.25 to 3.18 eV. Consequently, the N-TiO2 coating showed enhanced photocatalytic activity under white-light-emitting-diode (LED) irradiation. The photocatalytic degradation rate for the N-TiO2 coating was about 1.4 times higher than that of the undoped TiO2 coating. SCOPUS: ar.j info:eu-repo/semantics/published |
| Databáze: | OpenAIRE |
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