There are plenty of atomic vacancies at the bottom
Girotto, Gustavo Z. LU
; Thill, Alisson S.
; Vogt, Marco A.H.
; de Souza, Danilo O.
and Bernardi, Fabiano
(2024)
In Applied Materials Today
41.
- Abstract
Atomic vacancies are primordial for controlling the photocatalytic activity of perovskites. On the one hand, they are useful adsorption sites and help narrow the band gap, but they may also trap the electron-hole pair created after light absorption. Its precise control, although essential, is hardly achieved with traditional methods. In this work, an alternative experimental approach is employed to finely control the atomic vacancy population of SrTiO3 nanoparticles for application in the photodegradation of methylene blue. The atomic vacancies are created through Au7+ irradiation using different fluencies. The irradiated samples exhibit a photodegradation efficiency up to three times higher than the case without... (More)
Atomic vacancies are primordial for controlling the photocatalytic activity of perovskites. On the one hand, they are useful adsorption sites and help narrow the band gap, but they may also trap the electron-hole pair created after light absorption. Its precise control, although essential, is hardly achieved with traditional methods. In this work, an alternative experimental approach is employed to finely control the atomic vacancy population of SrTiO3 nanoparticles for application in the photodegradation of methylene blue. The atomic vacancies are created through Au7+ irradiation using different fluencies. The irradiated samples exhibit a photodegradation efficiency up to three times higher than the case without irradiation. X-ray absorption spectroscopy (XAS) measurements show that the local atomic order decreases with the ion irradiation, but it increases again after the photodegradation reaction. After the reaction, new surface chemical components appear in the X-ray photoelectron spectroscopy (XPS) measurements. These come due to the atomic vacancy diffusion from the inner to the surface region, as explained by Density Function Theory (DFT) calculations. The improvement in the photodegradation results is closely related to these atomic vacancies at the surface, as demonstrated by in situ Small Angle X-Ray Scattering (SAXS) measurements, and these enable the H2O dissociation, thus forming radicals that desorb for degrading the methylene blue molecule.
(Less)
- author
- Girotto, Gustavo Z.
LU
; Thill, Alisson S.
; Vogt, Marco A.H.
; de Souza, Danilo O.
and Bernardi, Fabiano
- publishing date
- 2024-12
- type
- Contribution to journal
- publication status
- published
- keywords
- Perovskite, Photodegradation, Vacancy, XAS, XPS
- in
- Applied Materials Today
- volume
- 41
- article number
- 102479
- publisher
- Elsevier
- external identifiers
-
- scopus:85206640169
- ISSN
- 2352-9407
- DOI
- 10.1016/j.apmt.2024.102479
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2024 Elsevier Ltd
- id
- 05329c3d-5ea5-4062-b4f6-d047dab28ec5
- date added to LUP
- 2025-10-10 12:48:58
- date last changed
- 2025-10-17 13:33:05
@article{05329c3d-5ea5-4062-b4f6-d047dab28ec5,
abstract = {{<p>Atomic vacancies are primordial for controlling the photocatalytic activity of perovskites. On the one hand, they are useful adsorption sites and help narrow the band gap, but they may also trap the electron-hole pair created after light absorption. Its precise control, although essential, is hardly achieved with traditional methods. In this work, an alternative experimental approach is employed to finely control the atomic vacancy population of SrTiO<sub>3</sub> nanoparticles for application in the photodegradation of methylene blue. The atomic vacancies are created through Au<sup>7+</sup> irradiation using different fluencies. The irradiated samples exhibit a photodegradation efficiency up to three times higher than the case without irradiation. X-ray absorption spectroscopy (XAS) measurements show that the local atomic order decreases with the ion irradiation, but it increases again after the photodegradation reaction. After the reaction, new surface chemical components appear in the X-ray photoelectron spectroscopy (XPS) measurements. These come due to the atomic vacancy diffusion from the inner to the surface region, as explained by Density Function Theory (DFT) calculations. The improvement in the photodegradation results is closely related to these atomic vacancies at the surface, as demonstrated by in situ Small Angle X-Ray Scattering (SAXS) measurements, and these enable the H<sub>2</sub>O dissociation, thus forming radicals that desorb for degrading the methylene blue molecule.</p>}},
author = {{Girotto, Gustavo Z. and Thill, Alisson S. and Vogt, Marco A.H. and de Souza, Danilo O. and Bernardi, Fabiano}},
issn = {{2352-9407}},
keywords = {{Perovskite; Photodegradation; Vacancy; XAS; XPS}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Applied Materials Today}},
title = {{There are plenty of atomic vacancies at the bottom}},
url = {{http://dx.doi.org/10.1016/j.apmt.2024.102479}},
doi = {{10.1016/j.apmt.2024.102479}},
volume = {{41}},
year = {{2024}},
}