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Sensors 2017, 17(1), 2; doi:10.3390/s17010002

Graphene-Based Long-Period Fiber Grating Surface Plasmon Resonance Sensor for High-Sensitivity Gas Sensing

1
Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
2
Chongqing Research Center for Advanced Materials, Chongqing Academy of Science and Technology, Chongqing 401123, China
3
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China
4
Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 25 October 2016 / Revised: 7 December 2016 / Accepted: 12 December 2016 / Published: 22 December 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3935 KB, uploaded 22 December 2016]   |  

Abstract

A graphene-based long-period fiber grating (LPFG) surface plasmon resonance (SPR) sensor is proposed. A monolayer of graphene is coated onto the Ag film surface of the LPFG SPR sensor, which increases the intensity of the evanescent field on the surface of the fiber and thereby enhances the interaction between the SPR wave and molecules. Such features significantly improve the sensitivity of the sensor. The experimental results demonstrate that the sensitivity of the graphene-based LPFG SPR sensor can reach 0.344 nm%−1 for methane, which is improved 2.96 and 1.31 times with respect to the traditional LPFG sensor and Ag-coated LPFG SPR sensor, respectively. Meanwhile, the graphene-based LPFG SPR sensor exhibits excellent response characteristics and repeatability. Such a SPR sensing scheme offers a promising platform to achieve high sensitivity for gas-sensing applications. View Full-Text
Keywords: surface plasmon resonance; graphene; long-period fiber grating; sensitivity surface plasmon resonance; graphene; long-period fiber grating; sensitivity
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Wei, W.; Nong, J.; Zhang, G.; Tang, L.; Jiang, X.; Chen, N.; Luo, S.; Lan, G.; Zhu, Y. Graphene-Based Long-Period Fiber Grating Surface Plasmon Resonance Sensor for High-Sensitivity Gas Sensing. Sensors 2017, 17, 2.

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