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Application of micro-Raman spectroscopy to analysis of artworks
Váňová, Hana ; Němec, Ivan (advisor) ; Šloufová, Ivana (referee)
This thesis deals with the application of micro-Raman spectroscopy to analysis of artworks. The main topic of the thesis was to qualify, select and eventually optimize methods acceptable to identification of indigo dye in the paint layers of artworks. Selected dye was studied in various states using set of excitation lasers emitting in the visible region. There was also studied the real usage of resonance and surface-enhanced methods. The result of the thesis are the conclusions related with the suitability of particular techniques of Raman spectroscopy to identify the target pigment in the art.
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Corrosion products phase identification using micro-Raman and FTIR
Majtás, Dušan ; Mácová, Petra
Phase identification of corroded metal objects might be problematic because corrosion products are usually a complex mixture of different phases. Furthermore, some of present phases may be either semi-crystalline or amorphous. The most suitable procedure is to use X-ray diffraction (XRD), for identification of crystalline phases in bulk, in combination with micro-Raman spectroscopy to obtain information on smaller scale and given location. Micro-Raman spectroscopy identifies crystalline and semi-crystalline phases. The literature also reports of the application of Mössbauer spectroscopy to identify amorphous phases. In this work, the combined use of Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy is evaluated. The methods may be interchangeable to some point. But is it safe to assume that all phases present can be detected?
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Application of micro-Raman spectroscopy to analysis of artworks
Váňová, Hana ; Němec, Ivan (advisor) ; Šloufová, Ivana (referee)
This thesis deals with the application of micro-Raman spectroscopy to analysis of artworks. The main topic of the thesis was to qualify, select and eventually optimize methods acceptable to identification of indigo dye in the paint layers of artworks. Selected dye was studied in various states using set of excitation lasers emitting in the visible region. There was also studied the real usage of resonance and surface-enhanced methods. The result of the thesis are the conclusions related with the suitability of particular techniques of Raman spectroscopy to identify the target pigment in the art.
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Cross-section analysis and mapping using Raman spectroscopy
Majtás, Dušan ; Mácová, Petra ; Kreislová, Kateřina
When dealing with corroded objects, it is necessary to identify the corrosion products to develop a proper treatment for this particular object. Using X-ray diffraction is still suitable to do the phase composition analysis of the material; however it does the analysis of the material in bulk. It is also possible to use SEM to analyze the structure of the corrosion layers on a cross-section by EBSD method; however this method is time consuming. It is more suitable to use Raman spectroscopy when studying the structure of corrosion layers. Using proper equipment, such as Raman microscope it is possible to do not only analysis of precisely given point, but it is also possible to do mapping (both 1D and 2D) of the cross-section. Taking map of surface also does need time, but is definitely less time consuming compared to EBSD method.
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