Carbon : nickel nanocomposite templates – predefined stable catalysts for diameter-controlled growth of single-walled carbon nanotubes
| Autor: | G. Abrasonis, Sibylle Gemming, Tim Kunze, Svetlana Melkhanova, René Hübner, Matthias Krause, Miro Haluska, Adrian Keller |
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| Rok vydání: | 2016 |
| Předmět: |
Nanocomposite
Materials science Nanoparticle chemistry.chemical_element 02 engineering and technology Chemical vapor deposition Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention symbols.namesake Amorphous carbon Chemical engineering chemistry law symbols General Materials Science Composite material 0210 nano-technology Raman spectroscopy Carbon |
| Zdroj: | Nanoscale. 8:14888-14897 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c5nr06972f |
| Popis: | Carbon : nickel (C : Ni) nanocomposite templates (NCTs) were used as catalyst precursors for diameter-controlled growth of single-walled carbon nanotubes (SWCNTs) by chemical vapor deposition (CVD). Two NCT types of 2 nm thickness were prepared by ion beam co-sputtering without (type I) or with assisting Ar(+) ion irradiation (type II). NCT type I comprised Ni-rich nanoparticles (NPs) with defined diameter in an amorphous carbon matrix, while NCT type II was a homogenous C : Ni film. Based on the Raman spectra of more than 600 individual SWCNTs, the diameter distribution obtained from both types of NCT was determined. SWCNTs with a selective, monomodal diameter distribution are obtained from NCT type I. About 50% of the SWCNTs have a diameter of (1.36 ± 0.10) nm. In contrast to NCT type I, SWCNTs with a non-selective, relatively homogeneous diameter distribution from 0.80 to 1.40 nm covering 88% of all SWCNTs are obtained from NCT type II. From both catalyst templates predominantly separated as-grown SWCNTs are obtained. They are free of solvents or surfactants, exhibit a low degree of bundling and contain negligible amounts of MWCNTs. The study demonstrates the advantage of predefined catalysts for diameter-controlled SWCNT synthesis in comparison to in situ formed catalysts. |
| Databáze: | OpenAIRE |
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