研究目的
To develop an ultrasensitive Fe-C coated long period fiber gratings (LPFG) corrosion sensor using a graphene and silver nanowire composite as a conductive film for enhanced sensitivity and service life in corrosion monitoring.
研究成果
The Gr/AgNW-based Fe-C coated LPFG sensor demonstrated significantly higher sensitivity (up to 721% improvement in wavelength shift per mass loss) and longer service life (210% increase) compared to the silver-based sensor. The effective depth of influence for the evanescent field was greater than 30 μm with the Gr/AgNW film, enabling more accurate corrosion monitoring. Future work should focus on characterizing surface cracks and extending testing to real-world scenarios.
研究不足
The study is limited to laboratory conditions with a specific NaCl concentration; real-world applications may involve more complex environments. The surface cracks in the Fe-C coating were estimated but not fully characterized, requiring further validation with SEM. The electrical resistance of the graphene layer was relatively high, potentially affecting electroplating efficiency. The sensors were tested only for 72 hours, and long-term durability was not assessed.
1：Experimental Design and Method Selection:
The study involved fabricating and comparing two types of Fe-C coated LPFG sensors—one with a Gr/AgNW composite film and another with silver nano ink. The rationale was to enhance sensitivity and service life through improved optical transparency and conductivity. Methods included CO2 laser inscription for LPFG fabrication, chemical vapor deposition for graphene growth, wet transfer techniques, electroplating for Fe-C coating, and simultaneous optical and electrochemical measurements.
2：Sample Selection and Data Sources:
LPFG sensors were fabricated using Corning SMF 28e+ single-mode fiber. Three sensors of each type were prepared for repeatability. Data were collected from transmission spectra and electrochemical impedance spectroscopy (EIS) tests in a 3.5 wt.% NaCl solution.
3：5 wt.% NaCl solution.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a CO2 laser (SYNRAD Inc, Firestar V40), linear stage (Newport ILS 100HA), optical sensing interrogator (Micron Optics si255), potentiostat/EIS (Gamry instrument), SEM (Helios Nanolab), Raman spectrometer, and tint meter (WTM-1100). Materials included copper foil, PMMA, AgNW solution (ACS Material Inc.), silver nano ink (UT Dot. Inc.), electroplating solution components, and marine epoxy.
4：0). Materials included copper foil, PMMA, AgNW solution (ACS Material Inc.), silver nano ink (UT Dot. Inc.), electroplating solution components, and marine epoxy.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Steps included LPFG fabrication via CO2 laser, Gr growth on copper foil, PMMA spin-coating, wet transfer to LPFG, AgNW application, Fe-C electroplating, and testing in NaCl solution with simultaneous optical and EIS measurements every 2 hours for 72 hours.
5：Data Analysis Methods:
Data analysis involved monitoring wavelength and transmission shifts from optical spectra, interpreting Nyquist plots from EIS to derive charge transfer resistance and corrosion current density, and using Faraday's Law to calculate mass loss. Statistical analysis included linear regression for sensitivity calculations.
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