TY - JOUR
T1 - ZnO Nanorods Coated Tapered U-Shape Plastic Optical Fiber for Relative Humidity Detection
AU - Johari, Siti Halma
AU - Cheak, Tiu Zian
AU - Abdul Rahim, Hazli Rafis
AU - Jali, Mohd Hafiz
AU - Mohd Yusof, Haziezol Helmi
AU - Md Johari, Md Ashadi
AU - Yasin, Moh
AU - Harun, Sulaiman Wadi
N1 - Funding Information:
This research was funded by Malaysian Ministry of Higher Education through Fundamental Research Grant Scheme (Grant No: FP114-2020).
Publisher Copyright:
© 2022 by the authors.
PY - 2022/11
Y1 - 2022/11
N2 - A relative humidity sensor was fabricated by exploiting an evanescent wave (EW) on a U-bent tapered plastic optical fiber (POF) coated with zinc oxide (ZnO) nanorods. The POF was tapered manually using a polishing method to a diameter of 0.5 mm, a length of 5 cm, and a radius of 5 cm. ZnO nanorods were synthesized using a hydrothermal method and grown on the POF by a seeding process for 12 h. A significant response of the sensor was observed when the sensor was exposed to 35 to 90%RH due to the intense chemisorption process and changeable relative index in the POF. The sensitivity and resolution of the sensor have been improved by factors of 1.23 and 2.18, respectively, compared to the conventional tapered POF sensor without ZnO coating. Besides, the ZnO-coated sensor also exhibited better repeatability properties in terms of output voltage when exposed to 35 to 90%RH for three repeated measurements. The obtained results revealed that the proposed new POF sensor has an excellent sensing performance as an RH sensor in terms of sensitivity, repeatability, and stability properties.
AB - A relative humidity sensor was fabricated by exploiting an evanescent wave (EW) on a U-bent tapered plastic optical fiber (POF) coated with zinc oxide (ZnO) nanorods. The POF was tapered manually using a polishing method to a diameter of 0.5 mm, a length of 5 cm, and a radius of 5 cm. ZnO nanorods were synthesized using a hydrothermal method and grown on the POF by a seeding process for 12 h. A significant response of the sensor was observed when the sensor was exposed to 35 to 90%RH due to the intense chemisorption process and changeable relative index in the POF. The sensitivity and resolution of the sensor have been improved by factors of 1.23 and 2.18, respectively, compared to the conventional tapered POF sensor without ZnO coating. Besides, the ZnO-coated sensor also exhibited better repeatability properties in terms of output voltage when exposed to 35 to 90%RH for three repeated measurements. The obtained results revealed that the proposed new POF sensor has an excellent sensing performance as an RH sensor in terms of sensitivity, repeatability, and stability properties.
KW - evanescence wave sensor
KW - humidity sensing
KW - tapered plastic optical fiber
KW - zinc oxide nanorods
UR - http://www.scopus.com/inward/record.url?scp=85141760736&partnerID=8YFLogxK
U2 - 10.3390/photonics9110796
DO - 10.3390/photonics9110796
M3 - Article
AN - SCOPUS:85141760736
SN - 2304-6732
VL - 9
JO - Photonics
JF - Photonics
IS - 11
M1 - 796
ER -