Photochemical solution deposition of beta-Bi2O3 thin films

Abstract : The non-equilibrium beta-Bi2O3 polymorph is stabilized in thin films by a photochemical synthesis method. A strong ultraviolet-absorbing bismuth(III)-N-methyldiethanolamine complex is synthesized in solution as an ideal precursor for the beta-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 beta-Bi2O3 polymorph at a temperature as low as 250 A degrees C. The room temperature stabilization of the beta-Bi2O3 phase is confirmed by their structural characterization using four-circle X-ray diffractometry. This study unequivocally identified the tetragonal crystal structure of the beta-Bi2O3 polymorph in the films. The high phase purity of these beta-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.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02175437
Contributeur : Elisabeth van T Hof <>
Soumis le : vendredi 5 juillet 2019 - 17:01:59
Dernière modification le : vendredi 1 novembre 2019 - 18:52:05

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Dulce Perez-Mezcua, Inigo Bretos, Ricardo Jimenez, Jesus Ricote, Rafael Jose Jimenez-Rioboo, et al.. Photochemical solution deposition of beta-Bi2O3 thin films. Journal of Sol-Gel Science and Technology, Springer Verlag, 2017, 81 (2), pp.355-361. ⟨10.1007/s10971-016-4295-6⟩. ⟨hal-02175437⟩

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