Nonlocal Effects in the Confocal mu-Raman Characterization of Inhomogeneous Polymer Coatings

作者：Rodriguez R^*; Vargas S; Estevez M

来源：Journal of Materials Engineering and Performance, 2010, 19(8): 1199-1204.

DOI：10.1007/s11665-009-9585-5

• confocal technique
• inhomogeneous coatings characterization
• micro-Raman spectroscopy
• nonlocal contribution
• phase segregation

The confocal mu-Raman technique was used to characterize the morphology of inhomogeneous anti-graffiti coatings; for these systems, the antiadherent molecules were segregated to the external (exposed) surface forming a layer whose thickness was determined. The confocal data from these inhomogeneous coatings contains nonlocal contributions because the light scattered from sources near the specific specimen under analysis (the focused region) could not be completely rejected by the spatial filter of the confocal device. These nonlocal contributions had important effects in the Raman spectra, modifying the bands height profiles of homogeneous and inhomogeneous materials allowing their identification. Taking into account these nonlocal effects, it was possible to interpret correctly the relative intensities of the Raman bands and characterize properly the inhomogeneous coatings.

• 出版日期2010-11