Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation
We present experimental results and theoretical simulations of the adsorption behavior of the metal–organic precursor Co2(CO)8 on SiO2 surfaces after application of two different pretreatment steps, namely by air plasma cleaning or a focused electron beam pre-irradiation. We observe a spontaneous di...
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2012-07-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.3.63 |
| _version_ | 1818671526758580224 |
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| author | Kaliappan Muthukumar Harald O. Jeschke Roser Valentí Evgeniya Begun Johannes Schwenk Fabrizio Porrati Michael Huth |
| author_facet | Kaliappan Muthukumar Harald O. Jeschke Roser Valentí Evgeniya Begun Johannes Schwenk Fabrizio Porrati Michael Huth |
| author_sort | Kaliappan Muthukumar |
| collection | DOAJ |
| description | We present experimental results and theoretical simulations of the adsorption behavior of the metal–organic precursor Co2(CO)8 on SiO2 surfaces after application of two different pretreatment steps, namely by air plasma cleaning or a focused electron beam pre-irradiation. We observe a spontaneous dissociation of the precursor molecules as well as autodeposition of cobalt on the pretreated SiO2 surfaces. We also find that the differences in metal content and relative stability of these deposits depend on the pretreatment conditions of the substrate. Transport measurements of these deposits are also presented. We are led to assume that the degree of passivation of the SiO2 surface by hydroxyl groups is an important controlling factor in the dissociation process. Our calculations of various slab settings, using dispersion-corrected density functional theory, support this assumption. We observe physisorption of the precursor molecule on a fully hydroxylated SiO2 surface (untreated surface) and chemisorption on a partially hydroxylated SiO2 surface (pretreated surface) with a spontaneous dissociation of the precursor molecule. In view of these calculations, we discuss the origin of this dissociation and the subsequent autocatalysis. |
| first_indexed | 2024-12-17T07:25:25Z |
| format | Article |
| id | doaj.art-25e083fa74bf4d71984a1cade715fd19 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-17T07:25:25Z |
| publishDate | 2012-07-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-25e083fa74bf4d71984a1cade715fd192022-12-21T21:58:39ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862012-07-013154655510.3762/bjnano.3.632190-4286-3-63Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigationKaliappan Muthukumar0Harald O. Jeschke1Roser Valentí2Evgeniya Begun3Johannes Schwenk4Fabrizio Porrati5Michael Huth6Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyInstitut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyInstitut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, GermanyWe present experimental results and theoretical simulations of the adsorption behavior of the metal–organic precursor Co2(CO)8 on SiO2 surfaces after application of two different pretreatment steps, namely by air plasma cleaning or a focused electron beam pre-irradiation. We observe a spontaneous dissociation of the precursor molecules as well as autodeposition of cobalt on the pretreated SiO2 surfaces. We also find that the differences in metal content and relative stability of these deposits depend on the pretreatment conditions of the substrate. Transport measurements of these deposits are also presented. We are led to assume that the degree of passivation of the SiO2 surface by hydroxyl groups is an important controlling factor in the dissociation process. Our calculations of various slab settings, using dispersion-corrected density functional theory, support this assumption. We observe physisorption of the precursor molecule on a fully hydroxylated SiO2 surface (untreated surface) and chemisorption on a partially hydroxylated SiO2 surface (pretreated surface) with a spontaneous dissociation of the precursor molecule. In view of these calculations, we discuss the origin of this dissociation and the subsequent autocatalysis.https://doi.org/10.3762/bjnano.3.63Co2(CO)8depositiondissociationEBIDFEBIDprecursorradiation-induced nanostructures |
| spellingShingle | Kaliappan Muthukumar Harald O. Jeschke Roser Valentí Evgeniya Begun Johannes Schwenk Fabrizio Porrati Michael Huth Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation Beilstein Journal of Nanotechnology Co2(CO)8 deposition dissociation EBID FEBID precursor radiation-induced nanostructures |
| title | Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation |
| title_full | Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation |
| title_fullStr | Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation |
| title_full_unstemmed | Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation |
| title_short | Spontaneous dissociation of Co2(CO)8 and autocatalytic growth of Co on SiO2: A combined experimental and theoretical investigation |
| title_sort | spontaneous dissociation of co2 co 8 and autocatalytic growth of co on sio2 a combined experimental and theoretical investigation |
| topic | Co2(CO)8 deposition dissociation EBID FEBID precursor radiation-induced nanostructures |
| url | https://doi.org/10.3762/bjnano.3.63 |
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