کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5358583 | 1503628 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectroscopic ellipsometric and Raman spectroscopic investigations of pulsed laser treated glassy carbon surfaces
ترجمه فارسی عنوان
مطالعات اسپکتروسکوپی بیضه و رامان طیف سنجی لیزر پالسی تحت درمان سطوح کربن شیشه ای قرار گرفته است
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کلمات کلیدی
پردازش لیزری، طیف سنجی رامان، بیضه سنجی طیف سنجی، کربن شیشه ای
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
In this study spectroscopic ellipsometry (SE) and Raman spectroscopy are applied to study structural modification of glassy carbon, due to high intensity laser ablation. Two KrF lasers with different pulse durations (480Â fs and 18Â ns), an ArF (20Â ns), and a frequency doubled Nd:YAG laser (8Â ns) were applied to irradiate the surface of glassy carbon targets. The main characteristics of the different laser treatments are compared by introducing the volumetric fluence which takes into account the different absorption values at different wavelengths. SE showed the appearance of a modified layer on the ablated surfaces. In the case of the ns lasers the thickness of this layer was in the range of 10-60Â nm, while in the case of fs laser it was less than 20Â nm. In all cases the average refractive index (n) of the modified layers slightly decreased compared to the refractive index of glassy carbon. Increase in extinction coefficient (k) was observed in the cases of ArF and fs KrF laser treatment, while the k values decreased significantly in the cases of nanosecond pulse duration KrF and Nd:YAG laser treatments. In the Raman spectra of the ablated areas the characteristic D and G peaks were widened due to appearance of an amorphous phase. Both Raman spectroscopy and SE indicate that the irradiated areas show carbon nanoparticle formation in all cases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 336, 1 May 2015, Pages 343-348
Journal: Applied Surface Science - Volume 336, 1 May 2015, Pages 343-348
نویسندگان
J. Csontos, Z. Pápa, A. Gárdián, M. Füle, J. Budai, Z. Toth,