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Istituto di ricerche sulla combustione
Soppresso il 01/10/2020

Torna all'elenco Contributi in rivista anno 2020

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Probing soot structure and electronic properties by optical spectroscopy

Anno di pubblicazione: 2020

Autori: De Falco, Gianluigi; Picca, Francesca; Commodo, Mario; Minutolo, Patrizia

Affiliazioni autori: Consiglio Nazionale delle Ricerche; Università degli Studi di Napoli Federico II

Autori CNR:

  • MARIO COMMODO
  • PATRIZIA MINUTOLO

Lingua: inglese

Abstract: In this work, the physicochemical transformation of soot particles during the initial stages of formation and growth was investigated in a laminar premixed flame of ethylene and air. The selected flame condition allowed producing two classes of carbon nanoparticles, namely incipient and primary soot particles, on the basis of their size distribution. The two classes of particles have been selectively collected in well distinct flame zones for further chemico-physical characterization. The optical band gap decreases as particle size grows up. Particle medium range order and structure at molecular level have been investigated by Raman and fluorescence spectroscopy. Slight changes in particle composition were observed for incipient and primary soot. Both kinds of particles are made of a similar ensemble of fluorescence centers, which produce excitation dependent emission irrespective of particle sizes. In agreement with the Raman spectra, the molecular constituents of the particles are polyaromatic compounds with an average size of the order of ovalene molecules that only slightly increase from incipient to primary soot particles. These results suggest that the observed decrease of the optical band gap, as particle size increases, typical of a quantum-dot behavior, is not due to changes in particle composition at molecular level. Further investigations are needed to investigate possible evolution in supramolecular organization of the particles as they grow in flame and its effect on the optical band gap.

Lingua abstract: inglese

Rivista:

Fuel Butterworth Scientific,
Paese di pubblicazione: Regno Unito
Lingua: inglese
ISSN: 0016-2361

Numero volume: 259

DOI: 10.1016/j.fuel.2019.116244

Referee: Sì: Internazionale

Stato della pubblicazione: Published version

Indicizzato da: Scopus [2-s2.0-85072615473]

Parole chiave:

  • Fluorescence spectroscopy
  • Optical band gap
  • Raman spectroscopy
  • Soot nanoparticles

URL: http://www.scopus.com/record/display.url?eid=2-s2.0-85072615473&origin=inward

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