Structures obtained from resolidification of flame-melted single-crystal germanium
| Autor: | J. T. Dickinson, S. C. Langford, L. C. Jensen, M. L. Dawes |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Materials science
Fabrication business.industry Mechanical Engineering Oxide chemistry.chemical_element Bioengineering Germanium General Chemistry chemistry.chemical_compound Optics chemistry Mechanics of Materials Impurity General Materials Science SPHERES Electrical and Electronic Engineering Composite material business Single crystal Nanoscopic scale |
| Zdroj: | Nanotechnology. 5:101-112 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/0957-4484/5/2/006 |
| Popis: | When single-crystal germanium is partially melted with a gas flame in air, resolidification produces novel structures which may be useful for nanoscale fabrication. These features are dominated by a single, sharp cone, up to 5 mm long with a typical aspect ratio of 1.6. If impurity concentrations are sufficiently high, one or more micron-sized, impurity-rich spheres are formed at the tip of the cone. The surface displays a distinctive morphology which depends strongly on the chemical environment. After slow resolidification in air, the cone body and spheres are coated with fractal-like aggregates of spherical oxide particles. More rapid resolidification in laser-melted Ge can produce sharp (100 nm radius of curvature), clean cones. The observed features are attributed to dynamic resolidification, impurity segregation, and diffusion-limited aggregation processes. |
| Databáze: | OpenAIRE |
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