Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications
Abstract We present X‐ray absorption spectroscopy (XAS) data, ultraviolet photoelectron spectra (He I ) and metastable impact electron spectra (MIES) of cobalt nanoparticles (typically 4 to 10 nm), prepared by Co 2 (CO) 8 thermolysis and pre‐stabilized by smooth oxidation. We find that the particles...
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Online Access: | http://dx.doi.org/10.1002/aoc.760 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faoc.760 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aoc.760 |
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crwiley:10.1002/aoc.760 2024-06-02T08:05:12+00:00 Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications Rudenkiy, S. Frerichs, M. Voigts, F. Maus‐Friedrichs, W. Kempter, V. Brinkmann, R. Matoussevitch, N. Brijoux, W. Bönnemann, H. Palina, N. Modrow, H. Deutsche Forschungsgemeinschaft 2004 http://dx.doi.org/10.1002/aoc.760 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faoc.760 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aoc.760 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Applied Organometallic Chemistry volume 18, issue 10, page 553-560 ISSN 0268-2605 1099-0739 journal-article 2004 crwiley https://doi.org/10.1002/aoc.760 2024-05-03T10:51:33Z Abstract We present X‐ray absorption spectroscopy (XAS) data, ultraviolet photoelectron spectra (He I ) and metastable impact electron spectra (MIES) of cobalt nanoparticles (typically 4 to 10 nm), prepared by Co 2 (CO) 8 thermolysis and pre‐stabilized by smooth oxidation. We find that the particles consist of a core–shell system with a dominantly f.c.c. core and a shell in which CoC and CoO coordination is likely to occur. This corresponds well to the results from electron spectroscopy, that stabilization occurs via formation of (CoCO x ) and (CoO) groups formed during the oxidation procedure and appears sensitive to the reaction conditions. Peptization of the pre‐stabilized particles with KorantinSH surrounds the particles with a dense organic shell, stable up to about 250°C. The carbonic acid molecules of the shell are oriented predominantly perpendicular to the surface of the particles, their carboxyl functional group linking the shell with the cobalt particles. This result is also supported by the XAS data, where it is observed that, during peptization, CoC coordination is partly replaced by CoO coordination. In order to arrive at these statements, auxiliary measurements on bare and gas‐exposed cobalt films, also reported here, were required. Copyright © 2004 John Wiley & Sons, Ltd. Article in Journal/Newspaper Carbonic acid Wiley Online Library Applied Organometallic Chemistry 18 10 553 560 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract We present X‐ray absorption spectroscopy (XAS) data, ultraviolet photoelectron spectra (He I ) and metastable impact electron spectra (MIES) of cobalt nanoparticles (typically 4 to 10 nm), prepared by Co 2 (CO) 8 thermolysis and pre‐stabilized by smooth oxidation. We find that the particles consist of a core–shell system with a dominantly f.c.c. core and a shell in which CoC and CoO coordination is likely to occur. This corresponds well to the results from electron spectroscopy, that stabilization occurs via formation of (CoCO x ) and (CoO) groups formed during the oxidation procedure and appears sensitive to the reaction conditions. Peptization of the pre‐stabilized particles with KorantinSH surrounds the particles with a dense organic shell, stable up to about 250°C. The carbonic acid molecules of the shell are oriented predominantly perpendicular to the surface of the particles, their carboxyl functional group linking the shell with the cobalt particles. This result is also supported by the XAS data, where it is observed that, during peptization, CoC coordination is partly replaced by CoO coordination. In order to arrive at these statements, auxiliary measurements on bare and gas‐exposed cobalt films, also reported here, were required. Copyright © 2004 John Wiley & Sons, Ltd. |
author2 |
Deutsche Forschungsgemeinschaft |
format |
Article in Journal/Newspaper |
author |
Rudenkiy, S. Frerichs, M. Voigts, F. Maus‐Friedrichs, W. Kempter, V. Brinkmann, R. Matoussevitch, N. Brijoux, W. Bönnemann, H. Palina, N. Modrow, H. |
spellingShingle |
Rudenkiy, S. Frerichs, M. Voigts, F. Maus‐Friedrichs, W. Kempter, V. Brinkmann, R. Matoussevitch, N. Brijoux, W. Bönnemann, H. Palina, N. Modrow, H. Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
author_facet |
Rudenkiy, S. Frerichs, M. Voigts, F. Maus‐Friedrichs, W. Kempter, V. Brinkmann, R. Matoussevitch, N. Brijoux, W. Bönnemann, H. Palina, N. Modrow, H. |
author_sort |
Rudenkiy, S. |
title |
Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
title_short |
Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
title_full |
Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
title_fullStr |
Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
title_full_unstemmed |
Study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
title_sort |
study of the structure and stability of cobalt nanoparticles for ferrofluidic applications |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1002/aoc.760 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faoc.760 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aoc.760 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Applied Organometallic Chemistry volume 18, issue 10, page 553-560 ISSN 0268-2605 1099-0739 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/aoc.760 |
container_title |
Applied Organometallic Chemistry |
container_volume |
18 |
container_issue |
10 |
container_start_page |
553 |
op_container_end_page |
560 |
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1800749994288873472 |