Co-TCPP包覆薄芯光纤的CO传感器

CO Sensor Based on Co-TCPP Coating Thin-Core Fiber

提出了一种基于Co-四(4-羧苯基卟吩)(Co-TCPP)金属有机框架的马赫-曾德尔结构CO传感器。该传感结构在两段薄芯光纤以及薄芯光纤与单模光纤之间熔接粗锥,将Co-TCPP涂覆在薄芯光纤表面。Co-TCPP的纳米片状形貌和多孔微结构,使该传感器不仅易于与光纤粘附,还对CO有较强的吸附能力。通过X射线衍射、扫描电子显微镜、红外光谱、热重分析等表征分析敏感材料Co-TCPP的结构、形貌和性质。结果表明,该传感器对CO质量分数的灵敏度为0.0497 dB/10^(-6),对质量分数-光强的拟合度高达0.99148,CO质量分数为40×10^(-6)时的响应时间约为120 s,且对CO具有良好的选择性和时间稳定性。

A Mach-Zehnder-structured CO sensor based on Co-tetrakis(4-carboxy-phenyl) porphyrin (Co-TCPP) metal-organic framework is proposed in this study.In the sensing structure,a thick taper is fused between two sections of thincore optical fiber and between the thin-core fiber and the single-mode fiber,and Co-TCPP is coated on the thin-core fiber’s surface.The nanosheet-like morphology and porous microstructure of Co-TCPP make the sensor not only easy to adhere to the fiber but also have a strong adsorption capacity for CO.The structure,morphology,and properties of the sensitive material Co-TCPP are characterized and analyzed by X-ray diffraction,scanning electron microscopy,infrared spectroscopy,and thermogravimetric analysis.The findings demonstrate that the sensor’s sensitivity to CO mass fraction is 0.0497 dB/10^(-6),the fitting degree to mass fraction-light intensity is as high as 0.99148,and the response time is around 120 s when the CO mass fraction is 40×10^(-6),and it has good selectivity and time stability to CO.