Surface vibrational spectroscopy on shear-aligned poly(tetrafluoroethylene) films |
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| Authors: | Ji Na Ostroverkhov Victor Lagugné-Labarthet François Shen Yuen-Ron |
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| Affiliation: | Department of Physics, University of California at Berkeley, and Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. |
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| Abstract: | Sum-frequency vibrational spectroscopy was used to obtain the first surface vibrational spectra of shear-deposited highly oriented poly(tetrafluoroethylene) (PTFE, Teflon) thin films. The surface PTFE chains appeared to lie along the shearing direction. Vibrational modes observed at 1142 and 1204 cm-1 were found to have the E1 symmetry, in support of some earlier analysis in the long-lasting controversy over the assignment of these modes. |
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