Abstract
This article presents a study on cathodoluminescence (CL) of different space-used fluoropolymers, such as polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), and ethylene tetrafluoroethylene (ETFE). This experimental technique allows highlighting radiative energy transitions under electron irradiation and degradation mechanisms under high radiation doses. Samples were irradiated with an electron beam (10 keV–1 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula> A) under vacuum (10 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^{-6}$</tex-math> </inline-formula> mbar). A parametric study has been performed to analyze especially the effect of temperature and the injected radiation dose on the CL spectra of these different polymers. The CL spectrum for these three materials is composed of three elementary contributions at 2.2, 2.4, and 3.75 eV, each of them being associated with specific processes in relation to different chromophores present in the materials or generated by electronic irradiation. A decline in the amplitude of the CL spectra with the increasing temperature or accumulated radiation dose has been observed on these fluoropolymers.
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