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- W2040883261 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." @default.
- W2040883261 created "2016-06-24" @default.
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- W2040883261 date "2014-10-06" @default.
- W2040883261 modified "2023-10-16" @default.
- W2040883261 title "Nitrogen controlled iron catalyst phase during carbon nanotube growth" @default.
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- W2040883261 doi "https://doi.org/10.1063/1.4897950" @default.
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