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Micro‐Raman spectroscopy of carbon‐based black pigments
Author(s) -
Tomasini Eugenia P.,
Halac Emilia B.,
Reinoso María,
Di Liscia Emiliano J.,
Maier Marta S.
Publication year - 2012
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4159
Subject(s) - raman spectroscopy , carbon black , carbon fibers , amorphous carbon , pigment , graphite , materials science , spectroscopy , chemistry , analytical chemistry (journal) , optics , organic chemistry , composite material , physics , natural rubber , quantum mechanics , composite number
Carbon‐based black pigments are a wide group of dark‐colored materials, which are classified according to the starting material used and their method of manufacture. Raman spectroscopy is an ideal technique for the characterization of carbonaceous matter: crystalline carbon materials present well‐defined peaks, which can be easily assigned; amorphous carbon materials, on the other hand, show broad bands between 1300 and 1600 cm −1 . The aim of this work was the discrimination between carbon‐based pigments by micro‐Raman spectroscopy. Five carbon‐based pigments provided by Zecchi (lampblack, ivory black, bistre, bitumen, and graphite), two humic‐earth materials [Van Dyck (Kremer) and Earth of Kassel (Zecchi)], and a commercial wood charcoal were studied. Raman spectra of all the samples showed the characteristic bands at approximately 1580 and 1350 cm −1 ; however, a clear difference in position, width, and relative intensity could be observed for most of the samples. The resulting analysis showed that micro‐Raman spectroscopy allowed the discrimination of most of the reference pigments and allowed the identification of carbon‐based black pigments in two South American colonial paintings dated from the early 18th century. Copyright © 2012 John Wiley & Sons, Ltd.