Role of Catalyst Oxidation State in the Growth of Vertically Aligned Carbon Nanotubes
| العنوان: | Role of Catalyst Oxidation State in the Growth of Vertically Aligned Carbon Nanotubes |
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| المؤلفون: | Eti Teblum, Yossi Gofer, Gilbert Daniel Nessim, Cary L. Pint |
| المصدر: | The Journal of Physical Chemistry C. 116:24522-24528 |
| بيانات النشر: | American Chemical Society (ACS), 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | inorganic chemicals, Materials science, organic chemicals, Catalyst support, Nanotechnology, Carbon nanotube, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Catalysis, law.invention, Metal, General Energy, Chemical engineering, X-ray photoelectron spectroscopy, law, Oxidation state, visual_art, Oxidizing agent, visual_art.visual_art_medium, heterocyclic compounds, Physical and Theoretical Chemistry, Efficient catalyst |
| الوصف: | The impact of gas-phase pretreatment of supported iron-oxide catalyst utilized in aligned carbon nanotube (CNT) growth is studied to understand the correlation between the catalyst oxidation state and the growth characteristics of the aligned CNT forests. By varying the pretreatment conditions from a reducing to an oxidizing environment, notable changes are observed in both the collective CNT array growth behavior and the individual CNT characteristics. Although the greatest catalytic activity was observed following a full reduction to the zerovalent (metallic) Fe catalyst, growth is also observed from a catalyst composed of both Fe2O3 and Fe3O4 particles. XPS core-level analysis, following pretreatment of the catalyst, emphasizes the critical nature of the combined catalyst–underlayer interaction to achieve optimal catalyst activity during growth and hence the most efficient catalyst reduction process. Additionally, CNT diameters during growth were strongly affected by the pretreatment process. Overall, ... |
| تدمد: | 1932-7455 1932-7447 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::a4e541d9d9de8e36d134748060b843aaTest https://doi.org/10.1021/jp305169bTest |
| رقم الانضمام: | edsair.doi...........a4e541d9d9de8e36d134748060b843aa |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19327455 19327447 |
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