In situ Μ-printed optical fiber-tip CO2sensor using a photocrosslinkable poly(ionic liquid)

Jushuai Wu, Ming jie Yin, Karoline Seefeldt, Alessandro Dani, Ryan Guterman, Jiayin Yuan, Aping Zhang, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

54 Citations (Scopus)


Carbon dioxide (CO2) sensors play important roles in our daily life and production activities. However, it remains a challenge to develop a tiny device with remote sensing capability for detection of CO2concentration and related parameters. Here we present a new optical fiber-tip CO2sensor for simultaneous measurement of CO2concentration and temperature. A photocrosslinkable poly(ionic liquid), i.e. poly(1-allyl-3-vinylimidazolium bromide) (PAVB), with selective CO2adsorption capability was synthesized to fabricate miniature sensors via an in situ optical μ-printing technology. We directly printed several micrometer-scale Fabry–Pérot interferometers (FPIs) on the end face of a multicore optical fiber using the PAVB and SU-8 epoxy, respectively. We have demonstrated that the PAVB FPI sensor can measure CO2concentration with a sensitivity up to ∼35 pm/% in a wide range of 0%–75%, and its rise and fall dynamic response times are about 6.1 and 8.0 min, respectively. Meanwhile, the SU-8 FPI sensor is able to measure temperature with a sensitivity 0.059 nm/°C. Such a tiny CO2sensor can remotely and simultaneously measure CO2concentration and temperature in very small spaces and is thus promising for many applications ranging from waste gas detection to food quality control.
Original languageEnglish
Pages (from-to)833-839
Number of pages7
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 15 Apr 2018


  • Carbon dioxide sensor
  • Optical fiber sensor
  • Optical microfabrication
  • Poly(ionic liquid)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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