Photochemical solution deposition of β-Bi 2 O 3 thin fi lms

Content Provider	Semantic Scholar
Author	Pérez-Mezcua, Dulce Bretos, Iñigo Jiménez, Ricardo Ricote, Jesus Jiménez-Riobóo, Rafael J. Silva, Cosmelina Gonçalves Da Chateigner, Daniel Fuentes-Cobas, Luis E. Sirera, Rafael Calzada, M. Lourdes
Copyright Year	2017
Abstract	The non-equilibrium β-Bi2O3 polymorph is stabilized in thin films by a photochemical synthesis method. A strong ultraviolet-absorbing bismuth(III)-Nmethyldiethanolamine complex is synthesized in solution as an ideal precursor for the β-Bi2O3 phase. Ultraviolet-light induces the formation of an amorphous —Bi—O—Bi— continuous network in the films deposited from the former solution that easily converts into the β-Bi2O3 polymorph at a temperature as low as 250 °C. The room temperature stabilization of the β-Bi2O3 phase is confirmed by their structural characterization using four-circle X-ray diffractometry. This study unequivocally identified the tetragonal crystal structure of the β-Bi2O3 polymorph in the films. The high phase purity of these β-Bi2O3 films is responsible for their exceptional visible-light photocatalytic activity, thus enabling the applications of the films of this metastable phase at room-temperature conditions. Graphical Abstract Photosensitive precursor solutions containing a photosensitive Bi(III)-N-methyldiethanolamine complex lead to the stabilization of the high-temperature βBi2O3polymorph in films on Pt-coated silicon substrates prepared at a low temperature of 250 °C using UVirradiation. UV-absorbing Bi(III) solution ( 0.15 mol/L) Bi(NO3).3H20 + OH(CH2)3OH + CH3COOH + CH3N(CH2CH2OH)2 Molar ratio of 1.0/5.0 of Bi(III) to N-methyldiethanolamine Molar ratio of 4.0/1.0 of acetic acid to diol Reflux in air for 2 hours
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Alternate Webpage(s)	http://www.ecole.ensicaen.fr/~chateign/pdf/Perez-Mezcua_JSGST81_355.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article