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High Sensitivity of NO Gas Sensors Based on Novel Ag-Doped ZnO Nanoflowers Enhanced with a UV Light-Emitting Diode
journal contribution
posted on 2018-10-22, 12:20 authored by You-Ting Tsai, Shoou-Jinn Chang, Liang-Wen Ji, Yu-Jen Hsiao, I-Tseng Tang, Hao-Ying Lu, Yen-Lin ChuAn ultraviolet-enhanced
(UV-enhanced) nitric oxide (NO) sensor
based on silver-doped zinc oxide (ZnO) nanoflowers is developed using
a low-cost hydrothermal method. The results indicate that silver (Ag)
ions were doped into the ZnO nanostructure successfully, thus changing
the morphology. In the high-resolution transmission electron microscopy
images, we also found that some Ag ions were separated out onto the
surface of the ZnO nanoflowers and that the Ag-doped and Ag nanoparticles
improved the sensing property. The NO sensing property increased from
73.91 to 89.04% through the use of a UV light-emitting diode (UV-LED).
The response time was approximately 120 s without the UV-LED, and
the UV-enhanced Ag-doped ZnO nanoflower sensor exhibited a reduced
response time (60 s). The best working temperature could be reduced
from 200 to 150 °C using UV light illumination, and it was found
that the NO response increased by 15.13% at 150 °C. The UV photoresponse
of the Ag-doped ZnO nanoflowers and the mechanisms by which the improvement
of NO sensing property occurred through the use of UV light illumination
are discussed. The property of the gas sensor can be calibrated using
a self-photoelectric effect under UV light illumination. These interesting
UV-enhanced Ag-doped ZnO nanoflowers are viable candidates for practical
applications.
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UV-LEDAg-doped ZnO nanoflowersHigh SensitivityUV light-emitting diodeAg nanoparticlesGas SensorsUV light illuminationZnO nanostructureUV Light-Emitting Diodetransmission electron microscopy imagesgas sensorUV photoresponseAg ionsresponse timenitric oxideUV-enhanced Ag-doped ZnO nanoflowersUV-enhanced Ag-doped ZnO nanoflower sensorZnO nanoflowersself-photoelectric effectsilver-doped zinc oxidehydrothermal methodNovel Ag-Doped ZnO Nanoflowers Enhanced
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