Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy
Optical fibers are commonly used for distributed sensing in oil wells. In typical down-hole environment fibers are subjected to a significant mechanical stress at high temperatures and pressures. To prevent mechanical destruction of the fiber surface, optical fibers are coated with a thin carbon lay...
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Kazan Federal University
2018-03-01
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| Series: | Учёные записки Казанского университета: Серия Физико-математические науки |
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| Online Access: | https://kpfu.ru/characterization-of-carbon-nanolayer-of-optical_342732.html |
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| author | S.V. Saparina S.S. Kharintsev |
| author_facet | S.V. Saparina S.S. Kharintsev |
| author_sort | S.V. Saparina |
| collection | DOAJ |
| description | Optical fibers are commonly used for distributed sensing in oil wells. In typical down-hole environment fibers are subjected to a significant mechanical stress at high temperatures and pressures. To prevent mechanical destruction of the fiber surface, optical fibers are coated with a thin carbon layer. Although the considerable advance has been achieved in coating technologies, there is still no full understanding of the causes of microscopic cracks on the surface of the protective layer, which contribute to hydrogen penetration into the fiber core. In this work, we have characterized the surface structure of hermetic carbon coatings of different thicknesses, from 1 to 100 nm, using atomic force microscopy (AFM) and far- and near-field Raman spectroscopy. Based on the obtained results, we have determined the optimal composition, thickness, and morphology of the carbon layer that ensure the best hermetic properties of the layer with sufficient mechanical strength. In addition, the formation of carbon allotropes – nanotubes, graphene, soot, and fullerenes – in the protecting carbon layer has been revealed by near-field Raman spectroscopy. These allotropes can serve as additional pathways for diffusion of molecular hydrogen through the carbon layer onto silica glass. |
| format | Article |
| id | doaj-art-ab7d41ff64c146a5b6f660d55bb7ddd3 |
| institution | Kabale University |
| issn | 2541-7746 2500-2198 |
| language | English |
| publishDate | 2018-03-01 |
| publisher | Kazan Federal University |
| record_format | Article |
| series | Учёные записки Казанского университета: Серия Физико-математические науки |
| spelling | doaj-art-ab7d41ff64c146a5b6f660d55bb7ddd32024-12-02T08:34:31ZengKazan Federal UniversityУчёные записки Казанского университета: Серия Физико-математические науки2541-77462500-21982018-03-011601126134Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopyS.V. Saparina0S.S. Kharintsev1Kazan Federal University, Kazan, 420008 RussiaKazan Federal University, Kazan, 420008 Russia; Tatarstan Academy of Sciences, Institute of Applied Research, Kazan, 420111 RussiaOptical fibers are commonly used for distributed sensing in oil wells. In typical down-hole environment fibers are subjected to a significant mechanical stress at high temperatures and pressures. To prevent mechanical destruction of the fiber surface, optical fibers are coated with a thin carbon layer. Although the considerable advance has been achieved in coating technologies, there is still no full understanding of the causes of microscopic cracks on the surface of the protective layer, which contribute to hydrogen penetration into the fiber core. In this work, we have characterized the surface structure of hermetic carbon coatings of different thicknesses, from 1 to 100 nm, using atomic force microscopy (AFM) and far- and near-field Raman spectroscopy. Based on the obtained results, we have determined the optimal composition, thickness, and morphology of the carbon layer that ensure the best hermetic properties of the layer with sufficient mechanical strength. In addition, the formation of carbon allotropes – nanotubes, graphene, soot, and fullerenes – in the protecting carbon layer has been revealed by near-field Raman spectroscopy. These allotropes can serve as additional pathways for diffusion of molecular hydrogen through the carbon layer onto silica glass.https://kpfu.ru/characterization-of-carbon-nanolayer-of-optical_342732.htmloptical fiber sensorcarbon-coated optical fiberscarbon allotropesatomic force microscopynear-field raman spectroscopyoptical antenna |
| spellingShingle | S.V. Saparina S.S. Kharintsev Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy Учёные записки Казанского университета: Серия Физико-математические науки optical fiber sensor carbon-coated optical fibers carbon allotropes atomic force microscopy near-field raman spectroscopy optical antenna |
| title | Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy |
| title_full | Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy |
| title_fullStr | Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy |
| title_full_unstemmed | Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy |
| title_short | Characterization of carbon nanolayer of optical fibers via near-field Raman spectroscopy |
| title_sort | characterization of carbon nanolayer of optical fibers via near field raman spectroscopy |
| topic | optical fiber sensor carbon-coated optical fibers carbon allotropes atomic force microscopy near-field raman spectroscopy optical antenna |
| url | https://kpfu.ru/characterization-of-carbon-nanolayer-of-optical_342732.html |
| work_keys_str_mv | AT svsaparina characterizationofcarbonnanolayerofopticalfibersvianearfieldramanspectroscopy AT sskharintsev characterizationofcarbonnanolayerofopticalfibersvianearfieldramanspectroscopy |