Phase-specific detection of CO2 at sequestration pressure using mid-infrared fluoride fiber sensors

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-02-23 DOI:10.1016/j.optmat.2026.117986

Ai Hosoki , Airi Suka , Hideki Kuramitz , Akira Ueda , Amane Terai

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引用次数: 0

Abstract

Monitoring dissolved CO₂ under high-pressure conditions is important for subsurface environments relevant to geological sequestration. In this study, we report mid-infrared CO₂ absorbance measurements using compact attenuated total reflection (ATR) fiber-optic sensors. Two fluoride-fiber probes—a side-polished ZBLAN fiber and a tapered InF₃ fiber—were fabricated and evaluated in a pressure- and temperature-controlled system at 40 °C up to 8 MPa. CO₂ was detected in gaseous, aqueous, and supercritical states via distinct absorption features near 4.2 μm. In the aqueous phase, the ZBLAN sensor showed an approximately linear response and achieved a limit of detection of 7.03 mmol/L, while the InF₃ sensor enabled reliable detection of gaseous and supercritical CO₂. These results demonstrate phase-resolved CO₂ sensing with fluoride-fiber ATR probes under sequestration-relevant conditions and support their potential for in situ monitoring in subsurface systems, including geological sequestration and carbon-recycled geothermal applications.

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采用中红外氟化物光纤传感器对固存压力下CO2的相位特异性检测

在高压条件下监测溶解的CO2对于地质封存相关的地下环境非常重要。在这项研究中，我们报告了使用紧凑衰减全反射（ATR）光纤传感器的中红外CO2吸收测量。制备了两种氟化物纤维探针——一种侧面抛光的ZBLAN纤维和一种锥形的InF3纤维——并在压力和温度控制系统中进行了评估，温度为40 °C，最高可达8 MPa。在4.2 μm附近通过明显的吸收特征检测到气态、水态和超临界态的CO2。在水相中，ZBLAN传感器表现出近似线性响应，检测限为7.03 mmol/L，而InF3传感器能够可靠地检测气态和超临界CO2。这些结果证明了氟化光纤ATR探头在封存相关条件下的相位分辨CO2传感，并支持其在地下系统（包括地质封存和碳循环地热应用）的原位监测潜力。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.