Black phosphorus integrated tilted fiber grating for ultrasensitive heavy metal sensing

SENSORS AND ACTUATORS B-CHEMICAL

卷:257

Article

Liu, C.¹  Sun, Z.^1,2  Lv, J.²  Yu, X. F.²  Zhang, L.^2,3  Chen, X.¹ 

[1] Bangor Univ, Sch Elect Engn, Bangor LL57 1UT, Gwynedd, Wales

[2] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China

[3] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England

关键词: Black phosphorus;    Nanomaterials;    Fiber grating;    Optical sensor;    Chemical sensor;    Heavy metal;   

DOI  :  10.1016/j.snb.2017.11.022

来源: Elsevier

【 摘 要 】

We report the sub-parts-per-billion (sub-ppb) level detection of lead using black phosphorus (BP) integrated tilted fiber grating (BP-TFG) configuration where the light-matter interaction is enhanced. We synthesized BP nanosheets by using a liquid-phase exfoliation method and developed an in-situ layer-by-layer (i-LbL) technique for BP deposition. These approaches secured high-quality BP coating on specific fiber cylindrical surface with strong adhesion as well as a prospective thickness control. By taking advantage of i-LbL deposition, the unique optical tunable features including coating thickness-dependent polarization and polarization-selective coupling have been experimentally observed. Furthermore, the BP-TFG was exploited as the first BP-fiber optic chemical sensor for heavy metal Pb2+ ions detection, demonstrating significant performance of ultrahigh sensitivity up to 0.5 x 10(-3) dB/ppb, lower limit of detection down to 0.25 ppb, and wider concentration range from 0.1 ppb to 1.5 x 10(7) ppb. We believe that this BP-fiber optic architecture opens the path as an optical platform for superior chemical sensing and biomedical applications. (C) 2017 Elsevier B.V. All rights reserved.

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