Crystal Shape Engineering of Silicon Nanoparticles in a Thermal Aerosol Reactor
| Autor: | Benjamin Butz, Richard Körmer, Wolfgang Peukert, Erdmann Spiecker |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Silicon Scanning electron microscope Nanoparticle chemistry.chemical_element General Chemistry Condensed Matter Physics Silane Crystal Crystallinity Crystallography chemistry.chemical_compound Chemical engineering chemistry General Materials Science Particle size High-resolution transmission electron microscopy |
| Zdroj: | Crystal Growth & Design. 12:1330-1336 |
| ISSN: | 1528-7505 1528-7483 |
| DOI: | 10.1021/cg201394y |
| Popis: | In this work, the capability of gas phase synthesis for crystal shape engineering of silicon nanoparticles (SiNPs) in a hot wall reactor is demonstrated. Therefore, the necessary boundary conditions for the formation of monodisperse spherical SiNPs as well as octahedral-shaped particles from silane pyrolysis are systematically deduced. The different shapes of the SiNPs are ascribed to different growth regimes (reaction limitation, diffusion limitation) depending on the global process parameters. Single crystalline, defect-free, spherical particles with a mean diameter of 30 nm (geometric standard deviation below 1.1) and octahedra with a mean edge length of about 100 nm could be obtained solely by process parameter adjustment. Particle size and shape as well as crystallinity were characterized by scanning electron microscopy and X-ray diffraction. The inner structure and faceting of the particles were analyzed in detail by high resolution transmission electron microscopy. A model that elucidates the orien... |
| Databáze: | OpenAIRE |
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