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Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments

B(4)C/Pd multilayers with small d-spacing can easily degrade in the air, and the exact degradation process is not clear. In this work, we studied the chemical modification of B(4)C films and B(4)C/Pd double layers stored in four different environments: a dry nitrogen environment, the atmosphere, a d...

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Autores principales: Feng, Yufei, Qi, Runze, Jiang, Li, Huang, Qiushi, Li, Tongzhou, Liu, Genchang, Li, Wenbin, Yan, Wensheng, Zhang, Zhong, Wang, Zhanshan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7967193/
https://www.ncbi.nlm.nih.gov/pubmed/33803440
http://dx.doi.org/10.3390/ma14051319
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author Feng, Yufei
Qi, Runze
Jiang, Li
Huang, Qiushi
Li, Tongzhou
Liu, Genchang
Li, Wenbin
Yan, Wensheng
Zhang, Zhong
Wang, Zhanshan
author_facet Feng, Yufei
Qi, Runze
Jiang, Li
Huang, Qiushi
Li, Tongzhou
Liu, Genchang
Li, Wenbin
Yan, Wensheng
Zhang, Zhong
Wang, Zhanshan
author_sort Feng, Yufei
collection PubMed
description B(4)C/Pd multilayers with small d-spacing can easily degrade in the air, and the exact degradation process is not clear. In this work, we studied the chemical modification of B(4)C films and B(4)C/Pd double layers stored in four different environments: a dry nitrogen environment, the atmosphere, a dry oxygen-rich environment, and a wet nitrogen environment. The XANES spectra of the B(4)C/Pd layers placed in a dry oxygen-rich environment showed the most significant decrease in the σ* states of the B–C bonds and an increase in the π* states of the B–O bonds compared with the other samples. X-ray photoelectron spectroscopy (XPS) measurements of the samples placed in a dry oxygen-rich environment showed more intensive B-O binding signals in the B(4)C/Pd layers than in the single B(4)C film. The results of the Fourier-transform infrared spectroscopy (FTIR) showed a similar decrease in the B–C bonds and an increase in the B–O bonds in the B(4)C/Pd layers in contrast to the single B(4)C film placed in a dry oxygen-rich environment. We concluded that the combination of palladium catalysis and the high content of oxygen in the environment promoted the oxidization of boron, deteriorated the B(4)C composition.
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spelling pubmed-79671932021-03-18 Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments Feng, Yufei Qi, Runze Jiang, Li Huang, Qiushi Li, Tongzhou Liu, Genchang Li, Wenbin Yan, Wensheng Zhang, Zhong Wang, Zhanshan Materials (Basel) Article B(4)C/Pd multilayers with small d-spacing can easily degrade in the air, and the exact degradation process is not clear. In this work, we studied the chemical modification of B(4)C films and B(4)C/Pd double layers stored in four different environments: a dry nitrogen environment, the atmosphere, a dry oxygen-rich environment, and a wet nitrogen environment. The XANES spectra of the B(4)C/Pd layers placed in a dry oxygen-rich environment showed the most significant decrease in the σ* states of the B–C bonds and an increase in the π* states of the B–O bonds compared with the other samples. X-ray photoelectron spectroscopy (XPS) measurements of the samples placed in a dry oxygen-rich environment showed more intensive B-O binding signals in the B(4)C/Pd layers than in the single B(4)C film. The results of the Fourier-transform infrared spectroscopy (FTIR) showed a similar decrease in the B–C bonds and an increase in the B–O bonds in the B(4)C/Pd layers in contrast to the single B(4)C film placed in a dry oxygen-rich environment. We concluded that the combination of palladium catalysis and the high content of oxygen in the environment promoted the oxidization of boron, deteriorated the B(4)C composition. MDPI 2021-03-09 /pmc/articles/PMC7967193/ /pubmed/33803440 http://dx.doi.org/10.3390/ma14051319 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Feng, Yufei
Qi, Runze
Jiang, Li
Huang, Qiushi
Li, Tongzhou
Liu, Genchang
Li, Wenbin
Yan, Wensheng
Zhang, Zhong
Wang, Zhanshan
Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments
title Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments
title_full Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments
title_fullStr Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments
title_full_unstemmed Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments
title_short Chemical Modification of B(4)C Films and B(4)C/Pd Layers Stored in Different Environments
title_sort chemical modification of b(4)c films and b(4)c/pd layers stored in different environments
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7967193/
https://www.ncbi.nlm.nih.gov/pubmed/33803440
http://dx.doi.org/10.3390/ma14051319
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