Synthesis and Characterization of Cu and N Codoped RF-Sputtered TiO2 Films: Photoluminescence Dynamics of Charge Carriers Relevant for Water Splitting
| Autor: | Nicola Bazzanella, Anna Gakamsky, Z. El Koura, Antonio Miotello, Alberto Quaranta, Rohan Fernandes, A. Dick, Georgios E. Arnaoutakis, Nainesh Patel, Massimo Cazzanelli |
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| Rok vydání: | 2016 |
| Předmět: |
Anatase
Materials science Photoluminescence Dopant Inorganic chemistry Analytical chemistry Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound symbols.namesake General Energy chemistry symbols Water splitting Physical and Theoretical Chemistry Thin film 0210 nano-technology Spectroscopy Raman spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 120:12042-12050 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Cu–N codoped TiO2 anatase thin films with a nanocolumnar architecture have been synthesized by RF-magnetron sputtering and characterized by Raman, scanning electron spectroscopy, and X-photoelectron spectroscopy. Absorption, photoluminescence, and photoluminescence lifetimes of the prepared samples have been investigated to understand the dynamics of the photogenerated carriers in connection to both introduced defects and the modified TiO2 band structure. At low concentrations Cu is mainly present as Cu+, while at higher concentrations the Cu2+ oxidation state prevails. Nitrogen, at low concentration and without the presence of copper dopant, substitutionally replaces oxygen to form a O–Ti–N linkage. With increasing concentration, interstitial nitrogen and Ti–O–N and Ti–O–N–O linkages are observed. In all codoped samples nitrogen is present as both interstitial and substitutional dopant. From photoluminescence spectra it is observed that nitrogen, in cooperation with Cu, more heavily affects the oxide str... |
| Databáze: | OpenAIRE |
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