Optical dynamic range maximization for humidity sensing by controlling growth of zinc oxide nanorods

Yusof, Haziezol Helmi Mohd and Harun, Sulaiman Wadi and Dimyati, Kaharudin and Bora, Tanujjal and Mohammed, Waleed S. and Dutta, Joydeep (2018) Optical dynamic range maximization for humidity sensing by controlling growth of zinc oxide nanorods. Photonics and Nanostructures - Fundamentals and Applications, 30. pp. 57-64. ISSN 1569-4410, DOI https://doi.org/10.1016/j.photonics.2018.04.008.

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Official URL: https://doi.org/10.1016/j.photonics.2018.04.008


An experimental study of the dynamic range maximization with Zinc Oxide (ZnO) nanorods coated glass substrates for humidity and vapor sensing is reported. Growth time of the nanorods and the length of the coated segments were controlled to study the differences between a reference environmental condition (normal humidity or dry condition) and water vapor concentrations. In order to achieve long dynamic range of detection with respect to nanorods coverage, several substrates with triangular patterns of ZnO nanostructures were fabricated by selective hydrothermal growth over different durations of time (5 h, 10 h and 15 h). It was found that maximum dynamic range for the humidity sensing occurs for the combination parameters of normalized length (Z) of 0.23 and normalized scattering coefficient (ζ) of 0.3. A reduction in transmittance by 38% at humidity levels of 80% with reference point as 50% humidity was observed. The results could be correlated to a first order approximation model that assumes uniform growth and the optimum operating conditions for humidity sensing device. This study provides an option to correlate ZnO growth conditions for different vapor sensing applications which can set a platform for compact sensors where modulation of light intensity is followed.

Item Type: Article
Uncontrolled Keywords: Zinc oxide; Nanorods; Dynamic range; Humidity; Vapor sensing; Flat substrate
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Jan 2019 04:46
Last Modified: 30 Jan 2019 04:46
URI: http://eprints.um.edu.my/id/eprint/20238

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