Effect of agarose concentration on coated micro-bottle resonators for humidity detection

Zain, Huda Adnan and Batumalay, Malathy and Abdul Rahim, Hazli Rafis and Yasin, Moh and Harun, Sulaiman Wadi (2021) Effect of agarose concentration on coated micro-bottle resonators for humidity detection. Microwave and Optical Technology Letters, 63 (7). pp. 1826-1831. ISSN 0895-2477, DOI https://doi.org/10.1002/mop.32838.

Full text not available from this repository.


Agarose is a stable hydrophilic material commonly used for relative humidity sensing application. Agarose porous nature causes changes in its refractive index as relative humidity change. Micro bottle resonators are a promising choice for sensing applications due to their good quality factor. In this work, the effect of agarose gel concentration on micro-bottle ability to detect relative humidity changes was investigated. The agarose gel coating was made in two different concentrations 0.5% and 1%. These two concentrations were used as coating for microbottle resonators with the diameter of 190 mu m. The micro-bottle samples were made by the soften-and-compress technique. In the humidity range of 35%-85% RH, the 0.5% agarose gel coated microbottle had a sensitivity of 0.1077 dB/RH%. The microbottle resonator coated with the 1% solution showed a lower sensitivity of 0.0899 dB/RH%. This improvement in sensitivity with lower agarose gel concentration is due to the pore size of agarose gel. Yet, both concentrations showed improvement in sensitivity compared to the bare micro-bottle showing that agarose can be a potential choice for building sensitive efficient relative humidity sensors.

Item Type: Article
Funders: INTI International University and Colleges
Uncontrolled Keywords: Agarose gel; Humidity sensor; Micro; Bottle resonator; Relative humidity; Whispering gallery mode
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 31 Mar 2022 04:28
Last Modified: 31 Mar 2022 04:28
URI: http://eprints.um.edu.my/id/eprint/27894

Actions (login required)

View Item View Item