Marine salinity sensing using long-period fiber gratings enabled by stimuli-responsive polyelectrolyte multilayers

SENSORS AND ACTUATORS B-CHEMICAL

卷:253

Article

Yang, Fan¹  Sukhishvili, Svetlana²  Du, Henry¹  Tian, Fei¹ 

[1] Stevens Inst Technol, Dept Chem Engn & Mat Sci, Hoboken, NJ 07030 USA

[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

关键词: Fiber-optic sensors;    Salinity;    Long period gratings;    Polyelectrolytes;    Layer-by-layer assembly;   

DOI  :  10.1016/j.snb.2017.06.121

来源: Elsevier

【 摘 要 】

A highly sensitive fiber-optic salinity sensor synergistically combining long-period gratings (LPG) and stimuli-responsive polyelectrolyte multilayers is demonstrated. The LPG coupled with LP0,10 cladding mode was coated with ionic-strength-responsive chitosan (CHI)/poly (acrylic acid) (PAA) polyelectrolyte multilayers via the layer-by-layer (LbL) assembly technique. This LbL-coated LPG was exposed to NaCl solutions with varying concentrations for salinity measurement. The LPG resonance wavelength underwent a change from red shift to blue shift at the salt concentration of 0.5 M over the 0.1-0.8 M range at pH 7.5. A significant blue shift with a sensing response of 36 nm/M was observed from 0.5 to 0.8 M, relevant to that of seawater. This sensitivity is one order of magnitude higher than that obtained using as fabricated LPG without the stimuli-responsive LbL multilayers as well as documented studies. The mechanism associated with the salinity response of the LbL multilayers is discussed. (C) 2017 Published by Elsevier B.V.

【 授权许可】

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