DocumentCode :
79694
Title :
Tapered Plastic Optical Fiber Coated With Graphene for Uric Acid Detection
Author :
Batumalay, Malathy ; Harun, Sulaiman Wadi ; Ahmad, Farhan ; Md Nor, Roslan ; Zulkepely, Nurul R. ; Ahmad, Harith
Author_Institution :
Dept. of Electr. Eng., Univ. of Malaya, Kuala Lumpur, Malaysia
Volume :
14
Issue :
5
fYear :
2014
fDate :
May-14
Firstpage :
1704
Lastpage :
1709
Abstract :
A simple tapered plastic optical fiber (POF) sensor is proposed and demonstrated for the detection of uric acid concentrations in deionized water. The sensor uses a tapered POF probe coated with different concentrations of graphene in a polymer composite. The tapered fiber is fabricated using an etching method and has a waist diameter of 0.45 mm and tapering length of 10 mm. The coating improves the sensitivity of the proposed sensor as it changes the effective refractive index of the cladding and allows more lights to be transmitted from the tapered fiber. The probe is immersed in uric acid solution and it senses the relative acid concentration using intensity modulation technique. As the uric acid concentration varies from 0 to 500 ppm, the output voltage of the sensor increases linearly from 2.98 to 4.36 mV with a sensitivity of 0.0021 mV/ppm and a linearity of more than 98.88%. A more efficient and stable sensor with graphene polymer composite coating increases the sensitivity due to the effective refractive index of the deposited cladding that allows more light to be transmitted through the tapered fiber.
Keywords :
chemical sensors; fibre optic sensors; graphene; refractive index; C; POF sensor; cladding; deionized water; graphene; intensity modulation technique; polymer composite; refractive index; tapered plastic optical fiber; uric acid detection; voltage 2.98 mV; voltage 4.36 mV; Graphene; Optical fiber sensors; Optical fibers; Polymers; Refractive index; Sensitivity; Fiber optic sensor; graphene polymer composite; sensor sensitivity; tapered plastic optical fiber; uric acid;
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2014.2302900
Filename :
6727412
Link To Document :
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