Ethanol sensor based on cascaded tapered optical fiber with surface modification of ZIF-8

Zahgnqiang Wang, Hongyu Ma, Xinghua Yang, Nigel Copner, Yuhan Jiang*, Kang Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To detect trace amounts of ethanol in the air, a cascaded tapered optical fiber sensor with surface modified ZIF-8 was proposed. Using an in-situ growth method, ZIF-8 was immobilized on the surface of the sensing tapered optical fiber. Simultaneously, another reference tapered fiber with a similar Free Spectral Range (FSR) was connected in series, creating a Vernier effect that can amplify slight changes in the surface Refractive Index (RI) of the sensing tapered fiber. The RI sensitivity of the cascaded tapered fiber was 18366.17 nm/RIU, which was 9.6 times that of a single tapered fiber. The sensitivity of the sensor to ethanol gas at room temperature was investigated. In the concentration range of 0-140 ppm, the sensitivity was 0.1411 nm/ppm. The sensor exhibits high sensitivity, good reversibility and the capability for online detection, making it a convenient tool for monitoring ethanol leaks in industrial production.
Original languageEnglish
Article number135084
Number of pages7
JournalSensors and Actuators, B: Chemical
Early online date4 Dec 2023
Publication statusPublished - 1 Mar 2024


  • Tapered Fiber
  • Vernier Effect
  • ZIF-8
  • Ethanol sensor


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