Planar Optical Waveguide Evanescent Wave rm CO 2 Sensor Based on a Clad of Alstonia Scholaris Leaf Extract

An evanescent wave biosensor is designed and developed using a single mode planar optical waveguide based on a spin coated clad of leaf extract of Alstonia Scholaris. The fabricated sensor showed CO sub(2) concentration dependent response. The specialty of this sensor is that it can be used when sto...

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Veröffentlicht in:	IEEE sensors journal 2009-01, Vol.9 (1)
Hauptverfasser:	Vijayan, A, Fuke, M V, Karekar, R N, Aiyer, R C
Format:	Artikel
Sprache:	eng
Schlagworte:	Carbon dioxide Carbon monoxide Cladding Evanescent waves Humidity Optical waveguides Reproducibility Sensors
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creator	Vijayan, A Fuke, M V Karekar, R N Aiyer, R C
description	An evanescent wave biosensor is designed and developed using a single mode planar optical waveguide based on a spin coated clad of leaf extract of Alstonia Scholaris. The fabricated sensor showed CO sub(2) concentration dependent response. The specialty of this sensor is that it can be used when stored at room temperature (25degC) up to a maximum of 25-30 days with 90% retention of original sensitivity. These CO sub(2) sensing biochips showed good operational efficiency for 10 cycles. The planar optical waveguide is versatile, easy to fabricate and can be used for ppm level CO sub(2) measurement with good sensitivity. Cross sensitivity with respect to humidity is studied. The sensor exhibited a short response time of 4-5 s and recovery time of 25 s with good repeatability and reproducibility.
doi_str_mv	10.1109/JSEN.2008.2006448
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source	IEEE Electronic Library (IEL)
subjects	Carbon dioxide Carbon monoxide Cladding Evanescent waves Humidity Optical waveguides Reproducibility Sensors
title	Planar Optical Waveguide Evanescent Wave rm CO 2 Sensor Based on a Clad of Alstonia Scholaris Leaf Extract
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