TY - JOUR
T1 - Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration
AU - Chen, Tai You
AU - Chen, Huey Ing
AU - Hsu, Chi Shiang
AU - Huang, Chien Chang
AU - Wu, Jian Sheng
AU - Chou, Po Cheng
AU - Liu, Wen Chau
N1 - Funding Information:
This work was supported in part by the National Science Council of the Republic of China under contract no. NSC-100-2221-E-006-044-MY3 and NSC-100-2221-E-006-142-MY3 .
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/7/17
Y1 - 2015/7/17
N2 - Cross-linked ZnO nanorods (NRs)-based ammonia gas sensors have been fabricated and investigated. The influences of interdigitated electrode spacing d and working temperature on ammonia sensing performance are studied. It is found that when the electrode spacing d is reduced, the ammonia sensor response S would be increased due to the configuration transformation of ZnO NRs. The optimal working temperature is about 573 K due to the temperature dependence on reactions of oxygen species. The studied sensor with an electrode spacing d of 2 μm shows a maximum ammonia sensor response S of 81.6 under exposing to a 1000 ppm NH3/air gas at 573 K. Also, a lower detection limit of 10 ppm NH3/air is achieved. The improved ammonia detecting capability could be attributed to the formation of more cross-linked configurations. The adsorption-time (τa) and desorption-time (τb) constants of the studied sensor with an electrode spacing d of 2 μm, at 573 K, are 74 and 29 s, respectively. Finally, the studied sensor exhibits good gas sensing response and repeatability toward NH3 gas. Thus, the studied sensor with a cross-linked configuration gives a promise for high-performance ammonia sensing applications.
AB - Cross-linked ZnO nanorods (NRs)-based ammonia gas sensors have been fabricated and investigated. The influences of interdigitated electrode spacing d and working temperature on ammonia sensing performance are studied. It is found that when the electrode spacing d is reduced, the ammonia sensor response S would be increased due to the configuration transformation of ZnO NRs. The optimal working temperature is about 573 K due to the temperature dependence on reactions of oxygen species. The studied sensor with an electrode spacing d of 2 μm shows a maximum ammonia sensor response S of 81.6 under exposing to a 1000 ppm NH3/air gas at 573 K. Also, a lower detection limit of 10 ppm NH3/air is achieved. The improved ammonia detecting capability could be attributed to the formation of more cross-linked configurations. The adsorption-time (τa) and desorption-time (τb) constants of the studied sensor with an electrode spacing d of 2 μm, at 573 K, are 74 and 29 s, respectively. Finally, the studied sensor exhibits good gas sensing response and repeatability toward NH3 gas. Thus, the studied sensor with a cross-linked configuration gives a promise for high-performance ammonia sensing applications.
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U2 - 10.1016/j.snb.2015.06.122
DO - 10.1016/j.snb.2015.06.122
M3 - Article
AN - SCOPUS:84937028939
VL - 221
SP - 491
EP - 498
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
SN - 0925-4005
ER -