RESUMO
The present work summarizes our experimental data on Surface-enhanced Raman scattering (SERS) of inorganic pigments. The effect of pigment type on Raman scattering enhancement was studied. The paper also describes the features of the SERS-active substrates used as well as the methods of sample preparation for SERS analysis of the pigments. The results of successful application of SERS and micro-SERS for art pigments identification in the canvas paintings and icons have been demonstrated. The techniques allowed us to clearly identify the composition of blue and green paint layers as well as grounds in the nine artworks. This lead to determination of the lower time limit of work creation, to dating of the restoration interventions, to distinguish red ochers from two different deposit sources of raw mineral. The enhancement of Raman scattering intensities allows to reduce significantly the amount of the sample being taken from artwork (up to 1⯵g).
RESUMO
The possibility of using surface enhanced Raman scattering (SERS) detection method for bromate-anion determination and quantitative evaluation in water has been demonstrated for the first time. The decreasing of Rhodamine 6G (R6G) Raman peaks intensity has been used as the analytical signal corresponding to the catalytic oxidation by bromate. Electrostatically immobilized silver nanoparticles have been proven as efficient SERS-active substrate. A linear relationship between the Raman intensity of Rh6G as a function of BrO(3)(-) was observed in the range of 0 - 10(-7) Ð and the detect limit was as low as 10(-10) M (nearly 0.01 µg/L). The results prove the potential of the proposed method for further application in the development of new portable SERS-based sensors for drinking water monitoring with high sensitivity, simplicity and the low cost.
