| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kotakoski, Jani
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Scalable bottom-up synthesis of Co-Ni-doped graphene.citations
- 2024Probing the interaction range of electron beam-induced etching in STEM by a non-contact electron beam
- 2023Interface effects on titanium growth on graphenecitations
- 2023Creation of Single Vacancies in hBN with Electron Irradiationcitations
- 2023Revealing the influence of edge states on the electronic properties of PtSe 2citations
- 2022Indirect measurement of the carbon adatom migration barrier on graphenecitations
- 2021Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalizationcitations
- 2021The morphology of doubly-clamped graphene nanoribbons
- 2020Cluster Superlattice Membranescitations
- 2019Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphenecitations
- 2017Progress in electronics and photonics with nanomaterialscitations
- 2017Progress in electronics and photonics with nanomaterialscitations
- 2014Nitrogen controlled iron catalyst phase during carbon nanotube growthcitations
- 2013Scaling properties of charge transport in polycrystalline graphenecitations
- 2013Defects in bilayer silica and graphene: common trends in diverse hexagonal two-dimensional systemscitations
- 2006Energetics, structure, and long-range interaction of vacancy-type defects in carbon nanotubescitations
Places of action
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article
Nitrogen controlled iron catalyst phase during carbon nanotube growth
Abstract
Close control over the active catalyst phase and hence carbon nanotube structure remains challenging in catalytic chemical vapor deposition since multiple competing active catalyst phases typically co-exist under realistic synthesis conditions. Here, using in-situ X-ray diffractometry, we show that the phase of supported iron catalyst particles can be reliably controlled via the addition of NH3 during nanotube synthesis. Unlike polydisperse catalyst phase mixtures during H2 diluted nanotube growth, nitrogen addition controllably leads to phase-pure γ-Fe during pre-treatment and to phase-pure Fe3C during growth. We rationalize these findings in the context of ternary Fe-C-N phase diagram calculations and, thus, highlight the use of pre-treatment- and add-gases as a key parameter towards controlled carbon nanotube growth.