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- W2008271471 abstract "Abstract Laser ablation of Upilex-S polyimide films 80 μm thick was performed using a 355 nm pulsed Nd:YAG laser. Nanoparticles redeposited at the ablated zone and at the edge of the hole were observed. Chemical and structural changes of the Upilex-S polyimide surface after 355 nm laser irradiation in air were analyzed by X-ray photoelectron spectroscopy (XPS). Relative C content in the ablated zone was found to be higher, while both O and N contents were lower than in the untreated area. This indicates that laser irradiation released O and N atoms, and that the nanoparticles formed in the ablated zone consist mainly of carbon clusters. After deconvoluting the C 1s and O 1s spectra, three new components related to the carboxylate (OCO), ether (CO), and CO groups were detected in and around the ablated zone. In addition, one new component was found for O 1s spectra, and the peak at 288.2 eV related to the imide carbonyl groups was shifted by 0.2–0.6 eV. These effects are probably due to the oxidation and formation of a non-imide carbonyl group. At the edge of the hole enhanced oxidation was found: the C content was considerably lower than that in the ablated zone, and the C 1s peak was at 288.6±0.2 eV. This suggests the formation of oxidized nano-particles, which carry the non-imide carbonyl groups. Based on these results, the decomposition of Upilex-S polyimide irradiated by UV light occurs via a photothermal ablation process." @default.
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- W2008271471 date "2001-03-01" @default.
- W2008271471 modified "2023-10-05" @default.
- W2008271471 title "XPS investigation of Upilex-S polyimide ablated by 355 nm Nd:YAG laser irradiation" @default.
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- W2008271471 doi "https://doi.org/10.1016/s0169-4332(00)00884-9" @default.
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