Novel optical photothermal infrared (O-PTIR) spectroscopy for the noninvasive characterization of heritage glass-metal objects.
Andrea Marchetti, Victoria Beltran, Gert Nuyts, Ferenc Borondics, Steven De Meyer, Marina Van Bos, Jakub Jaroszewicz, Elke Otten, Marjolijn Debulpaep, Karolien De Wael
Author Information
Andrea Marchetti: AXES Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. ORCID
Victoria Beltran: AXES Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. ORCID
Gert Nuyts: AXES Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. ORCID
Ferenc Borondics: Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette CEDEX, France. ORCID
Steven De Meyer: AXES Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. ORCID
Marina Van Bos: Royal Institute for Cultural Heritage (KIK-IRPA), Parc du Cinquantenaire 1, B-1000 Brussels, Belgium. ORCID
Jakub Jaroszewicz: Warsaw University of Technology, Faculty of Materials Science and Engineering, ul. Wołoska 141, 02-507 Warsaw, Poland. ORCID
Elke Otten: Royal Institute for Cultural Heritage (KIK-IRPA), Parc du Cinquantenaire 1, B-1000 Brussels, Belgium.
Marjolijn Debulpaep: Royal Institute for Cultural Heritage (KIK-IRPA), Parc du Cinquantenaire 1, B-1000 Brussels, Belgium.
Karolien De Wael: AXES Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. ORCID
Optical photothermal infrared (O-PTIR) is a recently developed molecular spectroscopy technique that allows to noninvasively obtain chemical information on organic and inorganic samples at a submicrometric scale. The high spatial resolution (≈450 nm), lack of sample preparation, and comparability of the spectral results to traditional Fourier transform infrared spectroscopy make it a promising candidate for the analysis of cultural heritage. In this work, the potential of O-PTIR for the noninvasive characterization of small heritage objects (few cubic centimeters) is demonstrated on a series of degraded 16th century brass and glass decorative elements. These small and challenging samples, typically encountering limitations with existing noninvasive methods such as macroscopic x-ray powder diffraction and μRaman, were successfully characterized by O-PTIR, ultimately identifying the markers of glass-induced metal corrosion processes. The results clearly demonstrate how O-PTIR can be easily implemented in a noninvasive multianalytical strategy for the study of heritage materials, making it a fundamental tool for cultural heritage analyses.
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