Abstract

ZnO is identified as one of the promising coating materials in optical fiber for ammonia gas sensors. In this work, three-dimensional ZnO nanoflowers are fabricated via a facile hydrothermal method and used as sensitive coating materials for optical fiber ammonia gas sensors. Results show that the sensor with ZnO nanoflowers exhibits a high sensitivity of $5.75\mathrm{pm}/(\mathrm{\mu g}·{\mathrm{L}}^{-1})$ for ammonia concentration ranging from 0 to $5460\mathrm{\mu g}·{\mathrm{L}}^{-1}$, which is more than 2.6 times higher than that of the sensor with a coating of ZnO microspheres [$2.2\mathrm{pm}/(\mathrm{\mu g}·{\mathrm{L}}^{-1})$].

© 2018 Optical Society of America

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