Graphene oxide-deposited tilted fiber grating for ultrafast humidity sensing and human breath monitoring

Biqiang Jiang, Zhixuan Bi, Zhen Hao, Qingchen Yuan, Dingyi Feng, Kaiming Zhou, Lin Zhang, Xuetao Gan, Jianlin Zhao

Research output: Contribution to journalArticlepeer-review


We propose and experimentally demonstrate a high-performance relative humidity (RH) sensor by depositing graphene oxide (GO) onto tilted fiber grating (TFG). The largely tilted grating planes of the employed TFG can induce a set of polarization-dependent cladding modes and strong evanescent field to couple with the humidity-dependent dielectric of GO layer. The GO-deposited TFG presents the response sensitivities of 18.5 pm/%RH and 0.027 dB/%RH in the range of 30%˜80%RH by tracking the wavelength and intensity of a specific cladding mode resonance. By monitoring the human breath with different frequencies, the sensor exhibits an ultrafast response within ˜42 ms due to the thin GO film and unimpeded permeation of water molecules through GO interlayer. The easy fabrication, low hysteresis, fast response, and high repeatability and reliability of the proposed RH sensor may enable many potential applications including pharmaceutical processing, human health and environmental monitoring.
Original languageEnglish
Pages (from-to)336-341
Number of pages6
JournalSensors and Actuators, B: Chemical
Early online date8 May 2019
Publication statusPublished - 15 Aug 2019

Bibliographical note

© 2019 Published by Elsevier B.V. CC BY-NC-ND.

Funding: National Natural Science Foundation of China (Grants No. 61775182, 61505165, and 61522507).


  • Graphene oxide
  • Human breath monitoring
  • Humidity sensor
  • Tilted fiber grating


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