Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes

He, M.; Wang, X.; Zhang, L.; Wu, Q.; Song, X.; Chernov, A.I.; Fedotov, P.V.; Obraztsova, E.D.; Sainio, J.; Juang, H.; Cui, H.; Ding, F.; Kauppinen, E.; Kauppinen, E.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 января 2018 г.

Авторы: He M., Wang X., Zhang L., Wu Q., Song X., Chernov A.I., Fedotov P.V., Obraztsova E.D., Sainio J., Juang H., Cui H., Ding F., Kauppinen E., Kauppinen E.
Журнал: Carbon
Том: 128
Год издания: 2018
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 249
Последняя страница: 256
DOI: 10.1016/j.carbon.2017.11.093
Аннотация: The suitability of the Ni MgO catalyst as a catalyst in chiral-selective growth of single-walled carbon nanotubes (SWNTs) by chemical vapor deposition has been assessed. It reveals that catalyst calcination temperature plays an important role in affecting the catalyst performances. Using CO as the carbon precursor and a chemical vapor deposition reaction temperature of 600 °C, Ni MgO pre-calcined at 600 °C demonstrates the best performances in catalyzing the growth of SWNTs with predominant (6, 5) species. Systematic characterizations on catalysts calcinated at different temperatures indicate that Ni2+ ions diffuse towards the interior of MgO matrix upon annealing. DFT-based calculations reveal that the binding energy between Ni2+ and adjacent Ni(0) is larger than that between Mg2+ and Ni (0), while Ni2+ situated deep inside MgO has weak interactions with surface Ni atoms. This work highlights the importance of subsurface Ni2+ in anchoring reduced surface Ni atom, which inhibits the aggregation of Ni particles and therefore, facilitates the growth of SWNTs with a narrow chirality distribution.
Добавил в систему: Образцова Елена Дмитриевна

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Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubesстатья

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