In this contribution we report on a Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) study of some fluorinated compounds that are possible candidates as protectives for stone artefacts. Specimens of finely polished calcarenite stone were treated with diluted solutions of different fluorinated compounds of Zonyl (TM) family (DuPont) and analysed by ToF-SIMS. The results are compared with those obtained on gold surfaces treated with the same compounds. The spectra of the compounds deposited on the calcarenite substrate display a more rapid decrease of the peak intensities with mass, compared with those obtained from the same compounds on gold, at least in the case of four (FSA, FSP, 9361, 9027) of the five compounds considered in this study. in fact, the overall dependence of ion intensities along the mass range for one of the investigated sample (Zonyl 8740) was not strongly affected by the substrate (gold or calcarenite). Moreover, the spectra of this compound on gold or calcarenite display very similar fragmentation patterns, especially the negative ones. On the contrary, the other substances deposited on calcarenite (particularly FSP, 9361 and 9027) show fragmentation patterns that significantly differ from those obtained on the gold substrates. A detailed discussion of the fragmentation patterns will be given and the different (or similar) behaviour of the investigated compounds on the different surfaces will be interpreted in terms of interaction of some functional groups present in these Compounds (phosphate, carboxylic, sulphate) with the calcium carbonate (calcarenite) surface, that strongly influence the fragmentation pattern. This interpretation is Supported also by the results obtained on the calcarenite deposited samples by means of X-ray Photoelectron Spectroscopy. (C) 2009 Elsevier B.V. All rights reserved.

In this contribution we report on a Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) study of some fluorinated compounds that are possible candidates as protectives for stone artefacts. Specimens of finely polished calcarenite stone were treated with diluted solutions of different fluorinated compounds of Zonyl (TM) family (DuPont) and analysed by ToF-SIMS. The results are compared with those obtained on gold surfaces treated with the same compounds. The spectra of the compounds deposited on the calcarenite substrate display a more rapid decrease of the peak intensities with mass, compared with those obtained from the same compounds on gold, at least in the case of four (FSA, FSP, 9361, 9027) of the five compounds considered in this study. in fact, the overall dependence of ion intensities along the mass range for one of the investigated sample (Zonyl 8740) was not strongly affected by the substrate (gold or calcarenite). Moreover, the spectra of this compound on gold or calcarenite display very similar fragmentation patterns, especially the negative ones. On the contrary, the other substances deposited on calcarenite (particularly FSP, 9361 and 9027) show fragmentation patterns that significantly differ from those obtained on the gold substrates. A detailed discussion of the fragmentation patterns will be given and the different (or similar) behaviour of the investigated compounds on the different surfaces will be interpreted in terms of interaction of some functional groups present in these Compounds (phosphate, carboxylic, sulphate) with the calcium carbonate (calcarenite) surface, that strongly influence the fragmentation pattern. This interpretation is Supported also by the results obtained on the calcarenite deposited samples by means of X-ray Photoelectron Spectroscopy. (C) 2009 Elsevier B.V. All rights reserved.

Effects of the substrate on ToF-SIMS spectra of thin films of some fluorinated compounds deposited on calcarenite

TORRISI, Alberto;TUCCITTO, NUNZIO;LICCIARDELLO, Antonino
2009

Abstract

In this contribution we report on a Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) study of some fluorinated compounds that are possible candidates as protectives for stone artefacts. Specimens of finely polished calcarenite stone were treated with diluted solutions of different fluorinated compounds of Zonyl (TM) family (DuPont) and analysed by ToF-SIMS. The results are compared with those obtained on gold surfaces treated with the same compounds. The spectra of the compounds deposited on the calcarenite substrate display a more rapid decrease of the peak intensities with mass, compared with those obtained from the same compounds on gold, at least in the case of four (FSA, FSP, 9361, 9027) of the five compounds considered in this study. in fact, the overall dependence of ion intensities along the mass range for one of the investigated sample (Zonyl 8740) was not strongly affected by the substrate (gold or calcarenite). Moreover, the spectra of this compound on gold or calcarenite display very similar fragmentation patterns, especially the negative ones. On the contrary, the other substances deposited on calcarenite (particularly FSP, 9361 and 9027) show fragmentation patterns that significantly differ from those obtained on the gold substrates. A detailed discussion of the fragmentation patterns will be given and the different (or similar) behaviour of the investigated compounds on the different surfaces will be interpreted in terms of interaction of some functional groups present in these Compounds (phosphate, carboxylic, sulphate) with the calcium carbonate (calcarenite) surface, that strongly influence the fragmentation pattern. This interpretation is Supported also by the results obtained on the calcarenite deposited samples by means of X-ray Photoelectron Spectroscopy. (C) 2009 Elsevier B.V. All rights reserved.
In this contribution we report on a Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) study of some fluorinated compounds that are possible candidates as protectives for stone artefacts. Specimens of finely polished calcarenite stone were treated with diluted solutions of different fluorinated compounds of Zonyl (TM) family (DuPont) and analysed by ToF-SIMS. The results are compared with those obtained on gold surfaces treated with the same compounds. The spectra of the compounds deposited on the calcarenite substrate display a more rapid decrease of the peak intensities with mass, compared with those obtained from the same compounds on gold, at least in the case of four (FSA, FSP, 9361, 9027) of the five compounds considered in this study. in fact, the overall dependence of ion intensities along the mass range for one of the investigated sample (Zonyl 8740) was not strongly affected by the substrate (gold or calcarenite). Moreover, the spectra of this compound on gold or calcarenite display very similar fragmentation patterns, especially the negative ones. On the contrary, the other substances deposited on calcarenite (particularly FSP, 9361 and 9027) show fragmentation patterns that significantly differ from those obtained on the gold substrates. A detailed discussion of the fragmentation patterns will be given and the different (or similar) behaviour of the investigated compounds on the different surfaces will be interpreted in terms of interaction of some functional groups present in these Compounds (phosphate, carboxylic, sulphate) with the calcium carbonate (calcarenite) surface, that strongly influence the fragmentation pattern. This interpretation is Supported also by the results obtained on the calcarenite deposited samples by means of X-ray Photoelectron Spectroscopy. (C) 2009 Elsevier B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/10034
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