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Si29 Nanoparticles: A New Form of Silicon

  • Munir H. Nayfeh
Chapter

Abstract

We dispersed bulk silicon into ultrasmall Si nanoparticles (Si29, ~ 1 nm diameter) that have novel optical and electronic characteristics. The particles are ultrabright blue luminescent, two-fold brighter than fluorescein, and efficient under UV or near-infrared two-photon excitation. The blue emission from single particles is readily detectable. In addition to being ultrabright, reconstituted films exhibit stimulated and directed blue emission with high gain, and second harmonic generation. Using a density functional with exchange correlation, configuration interaction and Monte Carlo theory, we constructed a structural prototype for 29 atoms (magic number for Td symmetry). The particle is a filled fullerene, at the edge of the sp3 diamond-like and the sp2 graphite-like structures. Five atoms constitute the tetrahedral core. The remaining 24 atoms constitute a highly puckered (wrinkled) cage with a highly radiative quantum confinement-induced Si-Si reconstructed phase, found only in ultrasmall nanoparticles.

Keywords

Blue Emission Structural Prototype Direct Blue Configuration Interaction Single Blue Beam 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin Heidelberg 2002

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  • Munir H. Nayfeh

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