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Formation of beta-Bi₂O₃ and delta-Bi₂O₃ during laser irradiation of Bi films studied in-situ by spatially resolved Raman spectroscopy



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Díaz-Guerra Viejo, Carlos and Almodóvar, P. and Camacho López, M. and Camacho López, S. and Piqueras de Noriega, Javier (2017) Formation of beta-Bi₂O₃ and delta-Bi₂O₃ during laser irradiation of Bi films studied in-situ by spatially resolved Raman spectroscopy. Journal of alloys and compounds, 723 . pp. 520-526. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2017.06.263



The formation of different phases of Bi₂O₃ induced by laser irradiation of Bi films has been assessed in situ by micro-Raman spectroscopy as a function of laser wavelength, power density and irradiation time. Raman mapping of the irradiated samples enabled a spatially-resolved study of the distribution of the formed Bi₂O₃ phases. Red laser (633 nm) irradiation was found to induce the appearance of ß- Bi₂O₃, within a certain range of power densities, by diffusion- controlled processes. In contrast, ultraviolet (UV, 325 nm) laser irradiation, above a certain power density threshold, initially induces the formation of both beta and δ- Bi₂O₃ phases. The amount of the produced δ- Bi₂O₃ phase increases by increasing the irradiation time, while that of the beta phase follows the opposite trend. UV laser irradiation seems to be a suitable method to produce room temperature stable δ- Bi₂O₃ patterns on Bi films.

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© 2017 Elsevier B.V. All rights reserved.
The authors are indebted to Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM for XPS measurements. This work was supported by MINECO through projects MAT2012-31959, MAT2015-65274-R, CSD2009-0013 and it was partially supported by AFOSR grant FA9550-15-1-0142.

Uncontrolled Keywords:Thin-films; Photocatalytic activity; Oxidation-kinetics; Bismuth oxide; Crystallization; Nanostructures; Alpha- Bi₂O₃ ; Pulses; Growth; Beam
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:45288
Deposited On:31 Oct 2017 17:18
Last Modified:02 Nov 2017 08:23

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