Towards sub-nanometer scale EELS analysis of polymers in the TEM

Varlot, K.; Martin, Jean‐Michel; Quet, C.; Kihn, Y.

doi:10.1016/s0304-3991(97)00019-3

Cited by 48 publications

(51 citation statements)

References 16 publications

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“…Then the core-exciton peaks were extracted using a simulation of the ionization continuum developed by Tenailleau & Martin (1992). The extraction process has already been described elsewhere (Varlot et al, 1997). The carbon K-edge spectrum and the corresponding extracted core-exciton peaks are presented in Fig.…”

Section: Characteristic Signature Of Polystyrenementioning

confidence: 99%

Physical and chemical changes in polystyrene during electron irradiation using EELS in the TEM: contribution of the dielectric function

Varlot

Martin²,

Quet³

1998

Journal of Microscopy

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SummaryWe have performed electron energy-loss spectroscopy analysis of polystyrene in the analytical transmission electron microscope in order to evaluate the possibility of obtaining both chemical and dielectric information on the polymer at the submicrometre scale. Irradiation has also been studied, particularly the influence of the specimen temperature on the kinetics of degradation.The main results show that polystyrene is resistant to electron beam with a critical dose of about 10 4 C m ¹2 at 127 K. Spectra could be acquired with doses less than this critical dose. We were thus able to propose an identification of the different chemical bonds of carbon (including the C-H bond), in agreement with previous X-ray absorption near-edge structure experiments. The chemical changes in polystyrene due to severe irradiation damage are also visible in the carbon K-edge near-edge structure.At the same time, we calculated the dielectric function from the low-loss part of the spectra. Interestingly, this part of the spectrum is the most sensitive to irradiation, since great changes can be seen during exposure.Lastly, we propose a degradation process, in agreement with all these results.

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Section: Characteristic Signature Of Polystyrenementioning

confidence: 99%

Physical and chemical changes in polystyrene during electron irradiation using EELS in the TEM: contribution of the dielectric function

Varlot

Martin²,

Quet³

1998

Journal of Microscopy

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“…Careful examination of the peaks from freshly exposed and degradation saturated regions shows that the peak positions does not alter much but have influence on the FWHM of the peaks as shown in figure 11. These changes in the FWHM might be due to the degradation of the PET through intramolecular dehydrogenation and reorganization of the carbonyl group as suggested by Verlot et al [28] and shown in figure 4.…”

Section: Polyethylene Terephthalatementioning

confidence: 88%

“…[24][25][26][27][28][29][30][31][32][33]2018 There are two peaks observed in this region, which are common for polymers: peak around 5 eV from π to π* transition and peak around 23 eV from (π+σ) to (π+σ)* transition. It has been observed that the peak positions started to shift within fraction of seconds of exposure to the electron beam.…”

Section: Polycarbonatementioning

confidence: 99%

“…Their study suggested a significant increase in characteristic dose leading to a radiation damage as the electron beam diameter is reduced from 1 µm to below 1 nm. [24][25][26][27][28][29][30][31][32][33]2018 electron beam radiation damage of other polymers through TEM-EELS technique is also reported in literature [25,27,28]. The kinetic mechanism of polystyrene thermal degradation is being studied by Faravelli et al [29] through kinetic models and predicts the radical formation as the route cause of degradation.…”

Section: Effect Of Electron Beam Irradiation On Polymersmentioning

confidence: 99%

“…The order of stability can be translated as PC<PMMA<PET<PS<SMA as deduced from the dose required for degradation. [24][25][26][27][28][29][30][31][32][33]2018 degradation in polymers is unavoidable and the extent of degradation depends on the structure of the polymers.…”

Section: Effect Of Electron Beam Irradiation On Polymersmentioning

confidence: 99%

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Effect of Electron Beam Irradiation on Polymers

2018

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A B S T R A C TElectron energy loss spectroscopy (EELS) in combination with transmission electron microscopy (TEM) is widely used for chemical state analysis of variety of chemical compounds. High beam sensitivity of substances like polymers hinders the possibility of exploring in-depth analysis provided through the high spatially resolved EELS spectroscopy. In this study, the electron beam irradiation damage on polymers were analyzed with varying dose of electron beams. The stability of the polymers under electron beam exposure depends on the chemical structure on the polymers. In this study the polymers with and without phenyl groups namely Polycarbonate, Polyethylene terephthalate, Polystyrene, Styrene Maleic Anhydride and Polymethylmethacrylate are selected for the comparative degradation study. Effect of varying the electron dose on the stability of polymers were monitored by recording the low-loss EELS spectrum in π to π* transition and (π+σ) to (π+σ)* transition region.

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Optimization of ELNES processing using a four-parameter function: application to SiC fibers

Varlot

Martin

1999

Surf. Interface Anal.

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Towards sub-nanometer scale EELS analysis of polymers in the TEM

Cited by 48 publications

References 16 publications

Physical and chemical changes in polystyrene during electron irradiation using EELS in the TEM: contribution of the dielectric function

Physical and chemical changes in polystyrene during electron irradiation using EELS in the TEM: contribution of the dielectric function

Effect of Electron Beam Irradiation on Polymers

Optimization of ELNES processing using a four-parameter function: application to SiC fibers

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