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2D Plasmonic Tungsten Oxide Enabled Ultrasensitive Fiber Optics Gas Sensor
Author(s) -
Yao Qifeng,
Ren Guanghui,
Xu Kai,
Zhu Lianqing,
Khan Hareem,
Mohiuddin Md,
Khan Muhammad Waqas,
Zhang Bao Yue,
Jannat Azmira,
Haque Farjana,
Reza Syed Zahin,
Wang Yichao,
Wen Xiaoming,
Mitchell Arnan,
Ou Jian Zhen
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901383
Subject(s) - materials science , plasmon , optical fiber , surface plasmon resonance , optoelectronics , fiber optic sensor , fiber , wavelength , optics , surface plasmon , nanotechnology , nanoparticle , physics , composite material
Functional materials coated on optical fibers have demonstrated great potential for optical gas sensing applications. However, their sensitivity is typically limited to the sub‐parts per million (sub‐ppm) range. Here, for the first time a 2D near‐infrared plasmonic tungsten oxide (WO x ) enabled ultrasensitive fiber optics gas sensor on a side‐polished D‐shape single mode optical fiber is presented. The plasmon resonance wavelength range of 2D WO x is matched with a conventional telecommunications wavelength of 1550 nm for driving the optical fiber, therefore inducing a strong light–matter interaction. Upon the surface adsorption of gas molecules, free electrons in the 2D WO x body are redistributed changing the plasmon resonance properties and hence the transmission through the optical fiber. The sensor is selectively responsive to NO 2 at concentrations down to 44 parts per billion (ppb) with a limit of detection of 8 ppb at a relatively low elevated temperature. Such an excellent sensing performance is significantly improved over the previously reported fiber optics NO 2 sensors, which suggests the integration of 2D plasmonic degenerated semiconductors as a viable approach to develop high‐performance fiber optics gas sensors.