High-resolution electron energy loss spectroscopy and infrared spectroscopy of polymer surfaces: High-resolution and orientation effects of polytetrafluoroethylene films

Abstract

Articles you may be interested inSurface structure of 3C-SiC(111) fabricated by C60 precursor: A scanning tunneling microscopy and high resolution electron energy loss spectroscopy study Application of highresolution electron energy loss spectroscopy to the adsorption and the photoreaction of CH2I2 and CD3OD on a MoO x thin film J. Vac. Sci. Technol. A 13, 2689 (1995); 10.1116/1.579469Hydrogen and CO spillover at Cu/Rh(100) bimetallic surfaces studied by highresolution electron energyloss spectroscopy J.The vibrational structure of oriented polytetrafluoroethylene has been studied using high-resolution electron energy loss spectroscopy ͑HREELS͒ and infrared spectroscopy. Record-high resolutions of 6 -15 cm Ϫ1 in HREELS with a state-of-the-art spectrometer are reported. Selection rules and orientation effects probed by the two different spectroscopies are discussed and comparisons are made between surface and bulk structure. Resonance electron scattering in HREELS has been used to study orientation effects of an intense Raman-active ͑C-C͒ mode at 730 cm Ϫ1 . The resonance seen in HREELS is identified as the *͑C-C͒ state. HREELS results have been related to near-edge x-ray absorption fine structure results. We discuss several future improvements that need to be addressed if ultrahigh resolution EELS is to become a more applicable and powerful tool for the study of polymer surfaces.

High resolution electron energy loss spectroscopy study of Fomblin Z-tetraol thin films

“…a͒ Author to whom correspondence should be addressed; electronic mail: ag4b@andrew.cmu.edu tra from thin films of polytetrafluoroethylene ͑PTFE͒ rubbed onto a gold substrate. 8,9 The spectra obtained in that study are quite similar to those reported for PFPE films in this article but were obtained with higher resolution. That work suggested that the modes were excited by dipole scattering.…”

“…It is worth noting that our conclusion that the modes in our HREEL spectra are predominantly impact scattered differs from the conclusions of Akavoor et al derived from their HREELS study of PTFE films on gold. 8,9 The origin of the difference is not clear. It is likely that the disorder in our system is much higher than in the PTFE films as the PFPEs are liquid films.…”

High resolution electron energy loss spectroscopy investigation of plasma-modified polystyrene surfaces

“…High-resolution electron energy loss spectroscopy ͑HREELS͒ has seen wide application to molecular adsorption on metal and semiconductor surfaces 6,7 and has been applied to polymer films. 8,9 However, only recently have thick, insulating polymer materials been studied with sufficient resolution (ϳ50 cm Ϫ1 ) to render the technique useful for general applications. This was demonstrated on polystyrene ͑PS͒ and polytetrafluoroethylene ͑PTFE͒ by means of low-energy secondary electron beam neutralization and spectral restoration algorithms employed in conjunction with modern instrumentation.…”