Journal
OPTICS EXPRESS
Volume 22, Issue 25, Pages 31555-31567Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.031555
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Funding
- National Nature Science Foundation of China (NSFC) [61475066, 61177075, 11004086, 61008057, 61405075, 21006038, 51172099, 61177074]
- Core Technology Project of Strategic Emerging Industries of Guangdong Province [2012A032300016, 2012A080302004]
- Open Research Fund of State Key Laboratory of Bioelectronics Southeast University [2014H09]
- Project of Jinan University Undergraduate Innovating and Pioneering Training Program [201410559040]
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Graphene-based electrical chemical vapor sensors can achieve extremely high sensitivity, whereas the comparatively slow sensing response and recovery, the research focused on only low concentration detection, have been known as drawbacks for many applications requiring rapid and high concentration detection. Here we report a novel graphene-based fiber-optic relative humidity (RH) sensor relying on fundamentally different sensing mechanism. The sensor can achieve power variation of up to 6.9 dB in high relative humidity range (70-95%), and display linear response with correlation coefficient of 98.2%, sensitivity of 0.31 dB/% RH, response speed of faster than 0.13% RH/ s, and good repeatability in 75-95% RH. Theoretical analysis of sensing mechanism can explain the experimental result, and reveal the broad applying prospect of the sensor for other kinds of chemical vapor detection. This novel graphene-based optical sensor provides a beneficial complement to the existing electrical ones, and will promote the employment of graphene in chemical sensing techniques. (C) 2014 Optical Society of America
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