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- W2024366988 abstract "A Raman microscope using a total internal reflection (TIR) annular illumination geometry through a ZnSe solid immersion lens (SIL) is described. Spectra of a thin-film sample of the transparent organic conductor poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) on a polyethylene terephthalate (PET) substrate are presented and compared with those from a conventional confocal Raman configuration. These spectra demonstrate a significant increase in surface selectivity upon the use of TIR illumination, as the decay length of the evanescent excitation field limits the depth of sample probed in this configuration. Spectral interference from the underlying PET substrate layer is thus greatly reduced. An increase in surface selectivity is also demonstrated for spectra acquired through the SIL with uniform illumination. Raman images of a micropatterned PEDOT:PSS film acquired with TIR illumination are also reported. Enhanced lateral resolution is realized in this configuration because of the immersion effect of the SIL, and the sampling depth is limited to 150 nm by the choice of illumination geometry. This results in analysis volumes on the order of tens of femtoliters, nearly two orders of magnitude smaller than typically achieved in conventional confocal Raman microscopes. This approach yields Raman spectra and images with surface selectivity significantly greater than can be achieved in confocal Raman, and provides a valuable tool for the microanalysis of thin surface films. Published in 2010 by John Wiley & Sons, Ltd." @default.
- W2024366988 created "2016-06-24" @default.
- W2024366988 creator A5047862200 @default.
- W2024366988 date "2010-01-27" @default.
- W2024366988 modified "2023-09-27" @default.
- W2024366988 title "Surface-sensitive Raman microscopy with total internal reflection illumination" @default.
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- W2024366988 doi "https://doi.org/10.1002/jrs.2610" @default.
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