1. Vectorial method used to monitor an evolving system: Titanium oxide thin films under UV illumination
- Author
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Solène Béchu, Neal Fairley, Vincent Fernandez, Bernard Humbert, Mireille Richard-Plouet, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), and Casa Software Ltd more...
- Subjects
Materials science ,Band gap ,General Physics and Astronomy ,Infrared spectroscopy ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,X-ray photoelectron spectroscopy ,Vectorial method ,Thin film ,Spectroscopy ,Titanium oxides films ,Condensation ,Infrared spectra ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Surfaces, Coatings and Films ,Titanium oxide ,Solvent ,Chemical engineering ,Spectral separation ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,XPS spectra ,0210 nano-technology - Abstract
International audience; Under in situ UV illumination, some materials present evolution of their opto-electronic properties that can be monitored by spectroscopy. We present here a mathematical method which can be applied to spectroscopic measurements when an evolving set of data is recorded: the vectorial method. The investigations and quantifications are performed by Infrared spectroscopy and XPS on organic-inorganic thin films prepared by sol-gel. The inorganic part of these hybrid thin films contains Ti oxide-network based whereas the organic part is composed of N,N-dimethylformamide and its hydrolysis products. Under UV illumination, those films exhibit intermediate bandgap behavior due to the photoreduction of Ti(IV) in Ti(III). The role of the solvent in the thin film is underlined during the process of photoreduction together with an understanding of the condensation of the Ti oxide-based network, as these evolutions are critical for the opto-electronic properties of those thin films. more...
- Published
- 2018
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