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Observation of Structural Changes during Oxidation of Black and Brown Soot Using Raman Spectroscopy

Le, Thi Kim Cuong LU orcid ; Bergqvist, Saga LU ; Henriksson, Jonatan and Bengtsson, Per-Erik LU orcid (2024) In C: Journal of Carbon Research 10(38).
Abstract
In this study, Raman spectroscopy has been used to evaluate the evolution of the structural modification of soot during oxidation processes at various preset temperatures up to 700 °C. Two types of well-characterized mini-CAST soot, representing black soot and brown soot, were examined. The major difference between the signals from the two types of soot was the higher photoluminescence (PL) signal for brown soot compared with black soot, in addition to some variations in the first-order Raman signatures such as oxygenated groups and their evolutions during thermal oxidation treatment. An interesting observation was the increase in the PL signal for brown soot at increasing temperatures up to 150 °C probably due to the formation of small... (More)
In this study, Raman spectroscopy has been used to evaluate the evolution of the structural modification of soot during oxidation processes at various preset temperatures up to 700 °C. Two types of well-characterized mini-CAST soot, representing black soot and brown soot, were examined. The major difference between the signals from the two types of soot was the higher photoluminescence (PL) signal for brown soot compared with black soot, in addition to some variations in the first-order Raman signatures such as oxygenated groups and their evolutions during thermal oxidation treatment. An interesting observation was the increase in the PL signal for brown soot at increasing temperatures up to 150 °C probably due to the formation of small oxidized polycyclic aromatic hydrocarbon and defects, followed by a decrease in the PL signal until the soot was fully oxidized. We also demonstrated that brown soot is prone to oxidation in ex situ measurements, a factor that should be considered in the Raman analysis of soot. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ex situ Raman spectroscopy, black soot, brown soot, oxygenated groups, soot oxidation, photoluminescence
in
C: Journal of Carbon Research
volume
10
issue
38
pages
12 pages
publisher
MDPI AG
ISSN
2311-5629
DOI
10.3390/c10020038
language
English
LU publication?
yes
id
e4436337-8cb5-4ec2-845d-8d8237a70654
date added to LUP
2024-04-26 08:54:17
date last changed
2024-04-29 11:12:10
@article{e4436337-8cb5-4ec2-845d-8d8237a70654,
  abstract     = {{In this study, Raman spectroscopy has been used to evaluate the evolution of the structural modification of soot during oxidation processes at various preset temperatures up to 700 °C. Two types of well-characterized mini-CAST soot, representing black soot and brown soot, were examined. The major difference between the signals from the two types of soot was the higher photoluminescence (PL) signal for brown soot compared with black soot, in addition to some variations in the first-order Raman signatures such as oxygenated groups and their evolutions during thermal oxidation treatment. An interesting observation was the increase in the PL signal for brown soot at increasing temperatures up to 150 °C probably due to the formation of small oxidized polycyclic aromatic hydrocarbon and defects, followed by a decrease in the PL signal until the soot was fully oxidized. We also demonstrated that brown soot is prone to oxidation in ex situ measurements, a factor that should be considered in the Raman analysis of soot.}},
  author       = {{Le, Thi Kim Cuong and Bergqvist, Saga and Henriksson, Jonatan and Bengtsson, Per-Erik}},
  issn         = {{2311-5629}},
  keywords     = {{ex situ Raman spectroscopy; black soot; brown soot; oxygenated groups; soot oxidation; photoluminescence}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{38}},
  publisher    = {{MDPI AG}},
  series       = {{C: Journal of Carbon Research}},
  title        = {{Observation of Structural Changes during Oxidation of Black and Brown Soot Using Raman Spectroscopy}},
  url          = {{http://dx.doi.org/10.3390/c10020038}},
  doi          = {{10.3390/c10020038}},
  volume       = {{10}},
  year         = {{2024}},
}