Formation of silicon nanoparticles and web-like aggregates by femtosecond laser ablation in a background gas
| Autor: | Eric Mazur, J. E. Carey, Cynthia M. Friend, M.A. Sheehy, Brian R. Tull |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Silicon Nucleation Analytical chemistry chemistry.chemical_element Nanoparticle General Chemistry equipment and supplies Laser ablation synthesis in solution eye diseases Pulsed laser deposition Amorphous solid chemistry Chemical engineering Transmission electron microscopy General Materials Science sense organs Thin film |
| Zdroj: | Applied Physics A. 83:341-346 |
| ISSN: | 1432-0630 0947-8396 |
| DOI: | 10.1007/s00339-006-3502-7 |
| Popis: | We show that the mechanism of nanoparticle formation during femtosecond laser ablation of silicon is affected by the presence of a background gas. Femtosecond laser ablation of silicon in a H2 or H2S background gas yields a mixture of crystalline and amorphous nanoparticles. The crystalline nanoparticles form via a thermal mechanism of nucleation and growth. The amorphous material has smaller features and forms at a higher cooling rate than the crystalline nanoparticles. The background gas also results in the suspension of plume material in the gas for extended periods, resulting in the formation (on a thin film carbon substrate) of unusual aggregated structures including nanoscale webs that span tears in the film. The presence of a background gas provides additional control of the structure and composition of the nanoparticles during short pulse laser ablation. |
| Databáze: | OpenAIRE |
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