Near-infrared absorption gas sensing with metal-organic framework on optical fibers

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  • Despite significant advantages in terms of portability and cost, near-infrared (NIR) gas sensing still remains a great challenge due to its relatively weak overtone absorption from the fundamental vibrational bond absorption at the mid-IR frequency. In this paper, we demonstrated ultra-sensitive NIR gas sensing for carbon dioxide (CO₂) at 1.57 μm wavelength through nanoporous Cu-BTC (BTC = benzene-1,3,5-tricarboxylate) metal-organic framework (MOF) coated single-mode optical fiber. For the first time, we obtained high-resolution NIR spectroscopy of CO₂ sorbed in MOF without seeing any rotational side band, indicating that the tightly confined gas molecules in the MOF pores do not have any freedom of rotation. Real-time measurement of the mixed gas flow of CO₂ and Ar showed different response time depending on the concentration of CO₂, which is attributed to the complex sorption mechanism of CO₂ in Cu-BTC MOF. Most importantly, we realized ultra-low detection limit of CO₂ (<20 ppm) with only 5 cm long Cu-BTC MOF thin film coated on single-mode optical fibers.
  • Keywords: Fiber-optic sensors, Metal-organic, Framework, Infrared absorption, Gas sensors
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  • Chong, X., Kim, K. J., Li, E., Zhang, Y., Ohodnicki, P. R., Chang, C. H., & Wang, A. X. (2016). Near-infrared absorption gas sensing with metal-organic framework on optical fibers. Sensors and Actuators B: Chemical, 232, 43-51. doi:10.1016/j.snb.2016.03.135
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  • 232
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  • This technical effort was performed in support of the National Energy Technology Laboratory's (NETL) research under the RES contract DE-FE0004000 and the National Science Foundation under grant No. 1449383. Xinyuan Chong and Yujing Zhang are sponsored by the Graduate Student Fellowship from NETL.
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