Multiphoton fragmentation of PAMAM 5-capped-gold-nanoparticles induced by picosecond laser irradiation at 532nm (Articolo in rivista)

Type
Label
  • Multiphoton fragmentation of PAMAM 5-capped-gold-nanoparticles induced by picosecond laser irradiation at 532nm (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp072611k (literal)
Alternative label
  • Giusti A. (1), Giorgetti E. (2), Laza S. (3), Marsili P. (3), Giammanco F. (3) (2007)
    Multiphoton fragmentation of PAMAM 5-capped-gold-nanoparticles induced by picosecond laser irradiation at 532nm
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giusti A. (1), Giorgetti E. (2), Laza S. (3), Marsili P. (3), Giammanco F. (3) (literal)
Pagina inizio
  • 14984 (literal)
Pagina fine
  • 14991 (literal)
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  • 111 (literal)
Rivista
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  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) INSTM and department of Chemistry and Industrial Chemistry, Genova University, Via Dodecaneso 31, Genova, Italy; 2) INSTM and Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, Sesto Fiorentino (Firenze), Italy; 3) Department of Physycs \"E. Fermi\", Pisa University, Largo Bruno Pontecorvo 3, Pisa, Italy (literal)
Titolo
  • Multiphoton fragmentation of PAMAM 5-capped-gold-nanoparticles induced by picosecond laser irradiation at 532nm (literal)
Abstract
  • Fifth-generation ethylendiamine-core poly(amidoamine) (PAMAM G5)-capped gold nanoparticles were prepared by picosecond laser ablation in water, with the fundamental and second harmonic of a picosecond Nd:YAG laser. Although the visible wavelength exhibited a lower ablation threshold than that of the infrared one, the ablation process at 532 nm reached early saturation because of both linear and nonlinear absorption mechanisms, accompanied by fragmentation of existing nanoparticles. We demonstrate that the onset of the fragmentation can be monitored by simple UV-vis spectroscopy, thanks to the ability of PAMAM G5 to stabilize gold cations, which results in the growth of an intense band at 290 nm. We observed that, while with 532 nm (2.33 eV) irradiation a two-photon absorption mechanism induces fragmentation of the nanoparticles, the suspensions remain stable when irradiated with 1064 nm (1.17 eV) up to 60 GW/cm(2). (literal)
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