An ammonia sensor based on Lossy Mode Resonances on a tapered optical fibre coated with porphyrin-incorporated titanium dioxide

SENSORS AND ACTUATORS B-CHEMICAL

卷:242

Article

Tiwari, Divya¹  Mullaney, Kevin¹  Korposh, Serhiy²  James, Stephen W.¹  Lee, Seung-Woo³  Tatam, Ralph P.¹ 

[1] Cranfield Univ, Engn Photon, Cranfield MK43 0AL, Beds, England

[2] Univ Nottingham, Dept Elect & Elect Engn, Adv Opt Grp, Nottingham NG7 2RD, England

[3] Univ Kitakyushu, Grad Sch Environm Engn, 1-1 Hibikino, Kitakyushu, Fukuoka 8080135, Japan

关键词: Optical fibres;    Lossy Mode Resonances;    Ammonia sensing;   

DOI  :  10.1016/j.snb.2016.11.092

来源: Elsevier

【 摘 要 】

The development of a highly sensitive ammonia sensor is described. The sensor is formed by deposition of a nanoscale coating of titanium dioxide, containing a porphyrin as a functional material, onto a tapered optical fibre. The titanium dioxide, coating allows coupling of light from the fundamental core mode to a lossy mode supported by the coating, thus creating a Lossy Mode Resonance (LMR) in the transmission spectrum. A change in the refractive index of the coating caused by the interaction of the porphyrin with ammonia causes a change in the centre wavelength of the LMR, allowing concentrations of ammonia in water as low as 0.1 ppm to be detected, with a response time of less than 30 s. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

【 授权许可】

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