Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration

Tai You Chen, Huey-Ing Chen, Chi Shiang Hsu, Chien Chang Huang, Jian Sheng Wu, Po Cheng Chou, Wen-Chau Liu

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)491-498
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume221
DOIs
Publication statusPublished - 2015 Jul 17

Fingerprint

Chemical sensors
Nanorods
Ammonia
nanorods
ammonia
sensors
Sensors
configurations
gases
spacing
Electrodes
Gases
electrodes
Air
air
Temperature
Desorption
time constant
Oxygen
Adsorption

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Chen, Tai You ; Chen, Huey-Ing ; Hsu, Chi Shiang ; Huang, Chien Chang ; Wu, Jian Sheng ; Chou, Po Cheng ; Liu, Wen-Chau. / Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration. In: Sensors and Actuators, B: Chemical. 2015 ; Vol. 221. pp. 491-498.
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Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration. / Chen, Tai You; Chen, Huey-Ing; Hsu, Chi Shiang; Huang, Chien Chang; Wu, Jian Sheng; Chou, Po Cheng; Liu, Wen-Chau.

In: Sensors and Actuators, B: Chemical, Vol. 221, 17.07.2015, p. 491-498.

Research output: Contribution to journalArticle

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AU - Chou, Po Cheng

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