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Optical dynamic range maximization for humidity sensing by controlling growth of zinc oxide nanorods
Univ Malaya, Dept Elect Engn, Fac Engn, Kuala Lumpur 50603, Malaysia.;Univ Tekn Malaysia Melaka, Fac Elect & Comp Engn, Melaka 76100, Malaysia..
Univ Malaya, Dept Elect Engn, Fac Engn, Kuala Lumpur 50603, Malaysia..
Univ Malaya, Dept Elect Engn, Fac Engn, Kuala Lumpur 50603, Malaysia..
Asian Inst Technol, Sch Engn & Technol, Nanotechnol, Klongluang 12120, Pathumthani, Thailand..
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2018 (English)In: PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS, ISSN 1569-4410, Vol. 30, p. 57-64Article in journal (Refereed) Published
Abstract [en]

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 (zeta) 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. rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 30, p. 57-64
Keywords [en]
Zinc oxide, Nanorods, Dynamic range, Humidity, Vapor sensing, Flat substrate
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-242268DOI: 10.1016/j.photonics.2018.04.008ISI: 000455289100010Scopus ID: 2-s2.0-85046167295OAI: oai:DiVA.org:kth-242268DiVA, id: diva2:1285427
Note

QC 20190204

Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-04Bibliographically approved

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Dutta, Joydeep

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