Formation of uncapped nanometre-sized metal particles by decomposition of metal carbonyls in carbon nanotubes
| Autor: | Akos Botos, Andrei N. Khlobystov, Johannes Biskupek, Thomas W. Chamberlain, Ute Kaiser, Thilo Zoberbier |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Nanotube
Materials science Nanoparticle Nanotechnology 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Metal chemistry.chemical_compound Transition metal Chemical engineering chemistry Transmission electron microscopy law visual_art visual_art.visual_art_medium Nanometre 0210 nano-technology Carbon monoxide |
| Zdroj: | Chemical Science |
| ISSN: | 2041-6520 |
| DOI: | 10.1039/c2sc01026g |
| Popis: | Carbonyl complexes of transition metals (Mx(CO)y, where x = 1, 2, or 3 and y = 6, 10, or 12 for M = W, Re, or Os, respectively) inserted into single walled carbon nanotubes (SWNT, diameter 1.5 nm) transform into metallic nanoparticles (MNPs) under heat treatment or electron beam irradiation. The host-nanotube acts as an efficient template, controlling the growth of MNPs to ∼1 nm in diameter. The only co-product of nanoparticle formation, carbon monoxide (CO) gas, creates pockets of high pressure between nanoparticles, thus preventing their collision and coalescence into larger structures. As a result, the MNPs stay largely spheroidal in shape and are uniformly distributed throughout the entire length of the SWNT. Despite their extremely small size (on average each MNP contains 30–90 atoms) and no protection of their surface by a capping layer of molecules, the metallic nanoparticles encapsulated in nanotubes are very stable under ambient conditions and even at elevated temperatures. Aberration-corrected high-resolution transmission electron microscopy reveals the crystalline nature of the MNPs, probes their interactions with the nanotube interior and illustrates the complex dynamics of confined MNPs in real-time and direct-space. |
| Databáze: | OpenAIRE |
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