Ultrashort Near-Infrared Fiber-Optic Sensors for Carbon Dioxide Detection Public Deposited

http://ir.library.oregonstate.edu/concern/articles/2801pj25c

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  • In this paper, we report a fiber-optic carbon dioxide (CO₂) near-infrared (IR) absorption sensor with only 8-cm sensing length that is coated with nanoporous metalorganic framework material Cu-BTC (BTC = benzene-1,3, 5-tricarboxylate). The multimode optical fiber was etched by hydrofluoric acid to remove the cladding and part of the core, resulting in larger evanescent field to sense the near-IR absorption induced by the adsorbed CO₂. The Cu-BTC thin film with 100 nm thickness was then grown onto the ethced core through a stepwise layer-by-layer method. Our real-time measurement results show that the CO₂ detection limit is better than 500 ppm and the overall response time is 40 s for absorption and 75 s for desorption. To the best of our knowledge, this is the shortest near-IR fiber-optic sensor for CO₂ detection at 1.57-μm wavelength.
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  • Chong, X., Kim, K. J., Ohodnicki, P., Li, E., Chang, C. H., & Wang, A. (2015). Ultra-Short Near-Infrared Fiber-Optic Sensors for Carbon Dioxide Detection. IEEE Sensors Journal, 15(9), 5327-5332. doi:10.1109/JSEN.2015.2438063
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