Synthesis of (001) oriented BiOI thin films by a dual-port ultrasonic spray pyrolysis system

[Display omitted] •Facile deposition of BiOI films by a dual-port ultrasonic spray pyrolysis system.•The DP-USP system avoids incompatibility of precursors allowing a uniform deposition.•Pure and uniform BiOI films (001) oriented were obtained.•BiOI presented visible photocatalytic degradation of in...

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Bibliographic Details
Published in:Materials letters 2020-06, Vol.269, p.127655, Article 127655
Main Authors: Arana-Trenado, J. Alejandro, Jayaraman, Vinoth Kumar, Bizarro, Monserrat
Format: Article
Language:English
Subjects:
Absorbance
Atomization
Atomizing
Bismuth
Bismuth oxyhalides
Catalytic activity
Degradation
Indigo
Indigo carmine
Iodine
Materials science
Photocatalysis
Spray pyrolysis
Substrates
Thin film
Thin films
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Summary:[Display omitted] •Facile deposition of BiOI films by a dual-port ultrasonic spray pyrolysis system.•The DP-USP system avoids incompatibility of precursors allowing a uniform deposition.•Pure and uniform BiOI films (001) oriented were obtained.•BiOI presented visible photocatalytic degradation of indigo carmine dye in acid pH. A dual-port ultrasonic spray pyrolysis (DP-USP) system was developed to obtain bismuth oxyiodide (BiOI) thin films. Independent bismuth and iodine precursor solutions were separately atomized and mixed in a chamber just above the heated substrate where reacted to form the film. This configuration allowed a complete reaction and uniform substrate coverage. Crystalline BiOI films were tetragonal with the typical layered structure; their band gap was around 1.6 eV and showed photocatalytic response under simulated sunlight. Photocatalytic activity, tested with indigo carmine (IC) dye molecule, was pH dependent, reaching the highest degradation at pH = 3. A careful evaluation of IC’s absorbance spectra indicated its decomposition into two degradation products. This was confirmed by comparison with theoretical calculations of the absorbance spectrum of IC and its degradation products.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.127655