Absorption Properties of Metal-Semiconductor Hybrid Nanoparticles (Articolo in rivista)

Type
Label
  • Absorption Properties of Metal-Semiconductor Hybrid Nanoparticles (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Shaviv E., O. Schubert, M. Alves-Santos, G. Goldoni, R. Di Felice, F. Vallee, N. Del Fatti, and U. Banin (2011)
    Absorption Properties of Metal-Semiconductor Hybrid Nanoparticles
    in ACS nano
    (literal)
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  • Shaviv E., O. Schubert, M. Alves-Santos, G. Goldoni, R. Di Felice, F. Vallee, N. Del Fatti, and U. Banin (literal)
Pagina inizio
  • 4712 (literal)
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  • 5 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • DOI: 10.1021/nn200645h Acknowledgmen: (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1. Johannes Gutenberg Univ Mainz, Inst Phys Chem, D-55128 Mainz, Germany (O. Schubert, C. Soennichsen) 2. Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel (E. Shaviv, U. Banin) 3. Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-91904 Jerusalem, Israel (E. Shaviv, U. Banin) 4. CNR Inst Nanosci, Ctr S3, I-41125 Modena, Italy (M. Alves-Santos, G. Goldoni, R. Di Felice) 5. Univ Modena & Reggio Emilia, Dipartimento Fis, I-41125 Modena, Italy (G. Goldoni) 6. Univ Lyon 1, F-69622 Villeurbanne, France (F. Vallee, N. Del Fatti) 7. CNRS, LASIM, FemtoNanoOpt Grp, F-69622 Villeurbanne, France (F. Vallee, N. Del Fatti) (literal)
Titolo
  • Absorption Properties of Metal-Semiconductor Hybrid Nanoparticles (literal)
Abstract
  • The optical response of hybrid metal semiconductor nanoparticles exhibits different behaviors due to the proximity between the disparate materials. For some hybrid systems, such as CdS-Au matchstick-shaped hybrids, the particles essentially retain the optical properties of their original components, with minor changes. Other systems, such as CdSe-Au dumbbell-shaped nanoparticles, exhibit significant change in the optical properties due to strong coupling between the two materials. Here, we study the absorption of these hybrids by comparing experimental results with simulations using the discrete dipole approximation method (DDA) employing dielectric functions of the bare components as inputs. For CdS-Au nanoparticles, the DDA simulation provides insights on the gold tip shape and its interface with the semiconductor, information that is difficult to acquire by experimental means alone. Furthermore, the qualitative agreement between DDA simulations and experimental data for CdS-Au implies that most effects influencing the absorption of this hybrid system are well described by local dielectric functions obtained separately for bare gold and CdS nanoparticles. For dumbbell shaped CdSe-Au, we find a shortcoming of the electrodynamic model, as it does not predict the \"washing out\" of the optical features of the semiconductor and the metal observed experimentally. The difference between experiment and theory is ascribed to strong interaction of the metal and semiconductor excitations, which spectrally overlap In the CdSe case. The present study exemplifies the employment of theoretical approaches used to describe the optical properties of semiconductors and metal nanoparticles, to achieve better understanding of the behavior of metal-semiconductor hybrid nanoparticle (literal)
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