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Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition
The ability of electrons and atomic hydrogen (AH) to remove residual chlorine from PtCl(2) deposits created from cis-Pt(CO)(2)Cl(2) by focused electron beam induced deposition (FEBID) is evaluated. Auger electron spectroscopy (AES) and energy-dispersive X-ray spectroscopy (EDS) measurements as well...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5704761/ https://www.ncbi.nlm.nih.gov/pubmed/29234576 http://dx.doi.org/10.3762/bjnano.8.240 |
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author | Spencer, Julie A Barclay, Michael Gallagher, Miranda J Winkler, Robert Unlu, Ilyas Wu, Yung-Chien Plank, Harald McElwee-White, Lisa Fairbrother, D Howard |
author_facet | Spencer, Julie A Barclay, Michael Gallagher, Miranda J Winkler, Robert Unlu, Ilyas Wu, Yung-Chien Plank, Harald McElwee-White, Lisa Fairbrother, D Howard |
author_sort | Spencer, Julie A |
collection | PubMed |
description | The ability of electrons and atomic hydrogen (AH) to remove residual chlorine from PtCl(2) deposits created from cis-Pt(CO)(2)Cl(2) by focused electron beam induced deposition (FEBID) is evaluated. Auger electron spectroscopy (AES) and energy-dispersive X-ray spectroscopy (EDS) measurements as well as thermodynamics calculations support the idea that electrons can remove chlorine from PtCl(2) structures via an electron-stimulated desorption (ESD) process. It was found that the effectiveness of electrons to purify deposits greater than a few nanometers in height is compromised by the limited escape depth of the chloride ions generated in the purification step. In contrast, chlorine atoms can be efficiently and completely removed from PtCl(2) deposits using AH, regardless of the thickness of the deposit. Although AH was found to be extremely effective at chemically purifying PtCl(2) deposits, its viability as a FEBID purification strategy is compromised by the mobility of transient Pt–H species formed during the purification process. Scanning electron microscopy data show that this results in the formation of porous structures and can even cause the deposit to lose structural integrity. However, this phenomenon suggests that the use of AH may be a useful strategy to create high surface area Pt catalysts and may reverse the effects of sintering. In marked contrast to the effect observed with AH, densification of the structure was observed during the postdeposition purification of PtC(x) deposits created from MeCpPtMe(3) using atomic oxygen (AO), although the limited penetration depth of AO restricts its effectiveness as a purification strategy to relatively small nanostructures. |
format | Online Article Text |
id | pubmed-5704761 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
spelling | pubmed-57047612017-12-12 Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition Spencer, Julie A Barclay, Michael Gallagher, Miranda J Winkler, Robert Unlu, Ilyas Wu, Yung-Chien Plank, Harald McElwee-White, Lisa Fairbrother, D Howard Beilstein J Nanotechnol Full Research Paper The ability of electrons and atomic hydrogen (AH) to remove residual chlorine from PtCl(2) deposits created from cis-Pt(CO)(2)Cl(2) by focused electron beam induced deposition (FEBID) is evaluated. Auger electron spectroscopy (AES) and energy-dispersive X-ray spectroscopy (EDS) measurements as well as thermodynamics calculations support the idea that electrons can remove chlorine from PtCl(2) structures via an electron-stimulated desorption (ESD) process. It was found that the effectiveness of electrons to purify deposits greater than a few nanometers in height is compromised by the limited escape depth of the chloride ions generated in the purification step. In contrast, chlorine atoms can be efficiently and completely removed from PtCl(2) deposits using AH, regardless of the thickness of the deposit. Although AH was found to be extremely effective at chemically purifying PtCl(2) deposits, its viability as a FEBID purification strategy is compromised by the mobility of transient Pt–H species formed during the purification process. Scanning electron microscopy data show that this results in the formation of porous structures and can even cause the deposit to lose structural integrity. However, this phenomenon suggests that the use of AH may be a useful strategy to create high surface area Pt catalysts and may reverse the effects of sintering. In marked contrast to the effect observed with AH, densification of the structure was observed during the postdeposition purification of PtC(x) deposits created from MeCpPtMe(3) using atomic oxygen (AO), although the limited penetration depth of AO restricts its effectiveness as a purification strategy to relatively small nanostructures. Beilstein-Institut 2017-11-15 /pmc/articles/PMC5704761/ /pubmed/29234576 http://dx.doi.org/10.3762/bjnano.8.240 Text en Copyright © 2017, Spencer et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms) |
spellingShingle | Full Research Paper Spencer, Julie A Barclay, Michael Gallagher, Miranda J Winkler, Robert Unlu, Ilyas Wu, Yung-Chien Plank, Harald McElwee-White, Lisa Fairbrother, D Howard Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition |
title | Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition |
title_full | Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition |
title_fullStr | Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition |
title_full_unstemmed | Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition |
title_short | Comparing postdeposition reactions of electrons and radicals with Pt nanostructures created by focused electron beam induced deposition |
title_sort | comparing postdeposition reactions of electrons and radicals with pt nanostructures created by focused electron beam induced deposition |
topic | Full Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5704761/ https://www.ncbi.nlm.nih.gov/pubmed/29234576 http://dx.doi.org/10.3762/bjnano.8.240 |
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