Infrared analysis of nano organic particles produced in laminar flames

Combustion-formed nanoparticles

“…Fourier-Transformed Infrared (FTIR) analysis and Surface-Enhanced Raman Scattering (SERS) have been employed to characterize nanoparticles produced in combustion by batch or in-situ [72,[81][82][83]. The measured spectral features supply insight on the chemical properties of the combustion products through the identification of CC, CH and CO bonding.…”

Spectroscopic investigation of flame synthesized carbon nanoparticle/P3HT blends

“…The presence of aliphatic functionalities, were clearly evident from the FTIR spectrum previously measured for the CNPs on a Caf 2 substrate shown in a previous work [30]. Indeed, a relevant signal due to CH 2 and CH 3 bonds is present in the FTIR spectrum.…”

“…A molecular model of the synthesized CNPs, sketched on the base of the particle characterization reported in the following and of other previously published investigation [19,30,31], is shown in Fig. 1 along with the chemical structure of P3HT and PCBM.…”

Surface enhanced Raman spectroscopy (SERS) of particles produced in premixed flame across soot threshold

“…However, the most interesting Raman features, that highlight differences between samples can be observed in the second order region of the spectrum: the bands centered at 2850, 2920 and 3050 cm À1 which are very strong and have a narrower width, less than about 50 cm À1 , than the other bands of amorphous carbon. Bonding vibrations at 2920 and 2850 cm À1 can be assigned to Raman active sp 3 CH 2 vibrations [5,6,11,25,30,31]; they were previously measured also in infrared spectra of particles collected in similar flames by water-based sampling [11]. The peak at 3050 cm À1 is instead indicative of aromatic C-H stretching vibration [5,6,25].…”

“…Precursor particles are also more deformable than aged soot as inferred by their low aspect ratio measured by Atomic Force Microscopy (AFM) when deposited by thermophoresis on mica substrates [9,10]. IR spectroscopy reveals a molecular-like character for soot precursors and incipient soot particles with spectra composed by sharp and narrow bands mainly due to aromatic and aliphatic bond vibrations [5,6,11]. In addition, medium range order is evidenced by Raman spectroscopy of soot precursor particles sampled in water, which shows the presence of the typical G and D bands measured in amorphous carbon compounds [12].…”