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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 39,
  • Issue 12,
  • pp. 3896-3902
  • (2021)

Graphitic Carbon Nitride for Enhancing Humidity Sensing of Microfibers

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Abstract

Graphitic carbon nitride (g-CN) nanosheet is a potential material for sensing applications. The g-CN nanosheet films deposited on microfibers were first fabricated and employed for relative humidity (RH) optical sensing. The RH sensitivity of microfibers was significantly enhanced via g-CN nanosheet coating, the optical transmitted power of coated microfiber humidity sensor was changed ∼10.6 dB when the RH varied from 40% to 95%. In addition, fast response time of 0.43 s and recovery time of 0.87 s were demonstrated by monitoring human breathing. The g-CN nanosheet coated microfiber humidity sensor possesses excellent stability, repeatability, reversibility, and cost-effectivity. The experimental results validate that the microfiber combined with g-CN nanosheets is a promising platform for environmental and biological RH sensing applications.

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