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Photodegradation of Si-doped GaAs nanowire

Researching optical effects in nanowires may require a high pump intensity which under ambient conditions can degrade nanowires due to thermal oxidation. In this work we investigated the photodegradation of a single Si-doped GaAs nanowire by laser heating in air. To understand the changes that occur...

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Autores principales: Pimenta, A. C. S., Limborço, H., González, J. C., Cifuentes, N., Ramos, Sérgio L. L. M., Matinaga, Franklin M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9076065/
https://www.ncbi.nlm.nih.gov/pubmed/35540654
http://dx.doi.org/10.1039/c9ra06365j
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author Pimenta, A. C. S.
Limborço, H.
González, J. C.
Cifuentes, N.
Ramos, Sérgio L. L. M.
Matinaga, Franklin M.
author_facet Pimenta, A. C. S.
Limborço, H.
González, J. C.
Cifuentes, N.
Ramos, Sérgio L. L. M.
Matinaga, Franklin M.
author_sort Pimenta, A. C. S.
collection PubMed
description Researching optical effects in nanowires may require a high pump intensity which under ambient conditions can degrade nanowires due to thermal oxidation. In this work we investigated the photodegradation of a single Si-doped GaAs nanowire by laser heating in air. To understand the changes that occurred on the nanowire we carried out Raman spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and photoluminescence spectroscopy in laser damaged regions as well as in non-affected ones. From Raman Stokes and anti-Stokes measurements we estimated the local temperature that the oxidation process of the nanowire (NW) surface starts at as 661 K, resulting in two new Raman modes at 200 cm(−1) and 259 cm(−1). Scanning electron microscopy and energy dispersive X-ray spectroscopy measurements showed a significant loss of arsenic in the oxidized regions, but no erosion of the nanowire. Micro-photoluminescence measurements showed the near-band-edge emission of GaAs along the nanowire, as well as a new emission band at 755 nm corresponding to polycrystalline β-Ga(2)O(3) formation. Our results also indicate that neither amorphous As nor crystalline As were deposited on the surface of the nanowire. Combining different experimental techniques, this study showed the formation of polycrystalline β-Ga(2)O(3) by oxidation of the nanowire surface and the limits for performing spectroscopic investigations on individual GaAs NWs under ambient air conditions.
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spelling pubmed-90760652022-05-09 Photodegradation of Si-doped GaAs nanowire Pimenta, A. C. S. Limborço, H. González, J. C. Cifuentes, N. Ramos, Sérgio L. L. M. Matinaga, Franklin M. RSC Adv Chemistry Researching optical effects in nanowires may require a high pump intensity which under ambient conditions can degrade nanowires due to thermal oxidation. In this work we investigated the photodegradation of a single Si-doped GaAs nanowire by laser heating in air. To understand the changes that occurred on the nanowire we carried out Raman spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and photoluminescence spectroscopy in laser damaged regions as well as in non-affected ones. From Raman Stokes and anti-Stokes measurements we estimated the local temperature that the oxidation process of the nanowire (NW) surface starts at as 661 K, resulting in two new Raman modes at 200 cm(−1) and 259 cm(−1). Scanning electron microscopy and energy dispersive X-ray spectroscopy measurements showed a significant loss of arsenic in the oxidized regions, but no erosion of the nanowire. Micro-photoluminescence measurements showed the near-band-edge emission of GaAs along the nanowire, as well as a new emission band at 755 nm corresponding to polycrystalline β-Ga(2)O(3) formation. Our results also indicate that neither amorphous As nor crystalline As were deposited on the surface of the nanowire. Combining different experimental techniques, this study showed the formation of polycrystalline β-Ga(2)O(3) by oxidation of the nanowire surface and the limits for performing spectroscopic investigations on individual GaAs NWs under ambient air conditions. The Royal Society of Chemistry 2019-12-02 /pmc/articles/PMC9076065/ /pubmed/35540654 http://dx.doi.org/10.1039/c9ra06365j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Pimenta, A. C. S.
Limborço, H.
González, J. C.
Cifuentes, N.
Ramos, Sérgio L. L. M.
Matinaga, Franklin M.
Photodegradation of Si-doped GaAs nanowire
title Photodegradation of Si-doped GaAs nanowire
title_full Photodegradation of Si-doped GaAs nanowire
title_fullStr Photodegradation of Si-doped GaAs nanowire
title_full_unstemmed Photodegradation of Si-doped GaAs nanowire
title_short Photodegradation of Si-doped GaAs nanowire
title_sort photodegradation of si-doped gaas nanowire
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9076065/
https://www.ncbi.nlm.nih.gov/pubmed/35540654
http://dx.doi.org/10.1039/c9ra06365j
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