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      Nano-FTIR absorption spectroscopy of molecular fingerprints at 20 nm spatial resolution.

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          Abstract

          We demonstrate Fourier transform infrared nanospectroscopy (nano-FTIR) based on a scattering-type scanning near-field optical microscope (s-SNOM) equipped with a coherent-continuum infrared light source. We show that the method can straightforwardly determine the infrared absorption spectrum of organic samples with a spatial resolution of 20 nm, corresponding to a probed volume as small as 10 zeptoliter (10(-20) L). Corroborated by theory, the nano-FTIR absorption spectra correlate well with conventional FTIR absorption spectra, as experimentally demonstrated with poly(methyl methacrylate) (PMMA) samples. Nano-FTIR can thus make use of standard infrared databases of molecular vibrations to identify organic materials in ultrasmall quantities and at ultrahigh spatial resolution. As an application example we demonstrate the identification of a nanoscale PDMS contamination on a PMMA sample.

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          Author and article information

          Journal
          Nano Lett
          Nano letters
          American Chemical Society (ACS)
          1530-6992
          1530-6984
          Aug 08 2012
          : 12
          : 8
          Affiliations
          [1 ] CIC nanoGUNE Consolider, 20018 Donostia - San Sebastián, Spain.
          Article
          10.1021/nl301159v
          22703339
          fa2ac44e-db8a-483c-9099-7a9752b80608
          History

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