Issue 29, 2021

In-flow optical characterization of flame-generated carbon nanoparticles sampled from a premixed flame

Abstract

In this work, the optical absorption properties of carbon nanoparticles are investigated by applying in-flow extinction and laser-induced incandescence measurements. Carbon nanoparticles are produced in an ethylene/air premixed flame and sampled at different heights above the burner. From extinction measurements, the absorption coefficient is obtained in a wide spectral range, considering the negligible scattering under our experimental conditions. With the application of Tauc plot the optical band gap is evaluated at the sampling heights under analysis. The increase of this value with the decrease in the height is consistent with the quantum confinement effect detected in the inception region of the flame. Two-color laser induced incandescence measurements are performed at relatively high laser fluence. The fluence curves, given by the particle temperature under laser irradiation versus laser fluence, are also obtained. A significant difference in the optical properties of these particles is observed by changing the sampling height. Moreover, considering the fluence curve in the low laser fluence regime, the refractive index absorption function E(m) is evaluated at an excitation wavelength of 1064 nm. Finally, the knowledge of the behavior of the absorption coefficient in a wide spectral range allows retrieving the values and the behavior of E(m) as a function of wavelength.

Graphical abstract: In-flow optical characterization of flame-generated carbon nanoparticles sampled from a premixed flame

Article information

Article type
Paper
Submitted
22 Mar 2021
Accepted
23 Jun 2021
First published
28 Jun 2021
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2021,23, 15702-15712

In-flow optical characterization of flame-generated carbon nanoparticles sampled from a premixed flame

F. Migliorini, S. Belmuso, S. Maffi, R. Dondè and S. De Iuliis, Phys. Chem. Chem. Phys., 2021, 23, 15702 DOI: 10.1039/D1CP01267C

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