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CO2 sensing at room temperature using carbon nanotubes coated core fiber Bragg grating

Shivananju, BN and Yamdagni, S and Fazuldeen, R. and Kumar, Sarin AK and Hegde, GM and Varma, MM and Asokan, S (2013) CO2 sensing at room temperature using carbon nanotubes coated core fiber Bragg grating. In: REVIEW OF SCIENTIFIC INSTRUMENTS, 84 (6).

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Official URL: http://dx.doi.org/10.1063/1.4810016

Abstract

The sensing of carbon dioxide (CO2) at room temperature, which has potential applications in environmental monitoring, healthcare, mining, biotechnology, food industry, etc., is a challenge for the scientific community due to the relative inertness of CO2. Here, we propose a novel gas sensor based on clad-etched Fiber Bragg Grating (FBG) with polyallylamine-amino-carbon nanotube coated on the surface of the core for detecting the concentrations of CO2 gas at room temperature, in ppm levels over a wide range (1000 ppm-4000 ppm). The limit of detection observed in polyallylamine-amino-carbon nanotube coated core-FBG has been found to be about 75 ppm. In this approach, when CO2 gas molecules interact with the polyallylamine-amino-carbon nanotube coated FBG, the effective refractive index of the fiber core changes, resulting in a shift in Bragg wavelength. The experimental data show a linear response of Bragg wavelength shift for increase in concentration of CO2 gas. Besides being reproducible and repeatable, the technique is fast, compact, and highly sensitive. (C) 2013 AIP Publishing LLC.

Item Type: Journal Article
Additional Information: Copyright of this article is belongs to AMER INST PHYSICS
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 09 Sep 2013 10:08
Last Modified: 09 Sep 2013 10:08
URI: http://eprints.iisc.ac.in/id/eprint/47073

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