Ammonia sensing characteristic of a Pt nanoparticle/aluminum-doped zinc oxide sensor

Huey Ing Chen, Cheng Yu Chi, Wei Cheng Chen, I. Ping Liu, Ching Hong Chang, Tzu Chieh Chou, Wen Chau Liu

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Pt nanoparticles (NPs) are deposited on a sputtered aluminum-doped zinc oxide (AZO) layer to form a new Pt NP/AZO ammonia sensor. As compared to the pristine sputtered AZO layer, the studied Pt NP/AZO device shows significant improvements in the ammonia sensing response and sensing speed due to the effectively catalytic activity of the Pt metal. Experimentally, under 1000 ppm NH3/air gas at 300 °C, a sensing response of 2183 is obtained for the studied Pt NP/AZO device, which is higher than that (24) of the pristine AZO one. The response and recovery time constants at 300 °C (350 °C) of 133 (24) s and 14 (4) s are acquired, respectively, for the studied Pt NP/AZO sensor under 1000 ppm NH3/air gas. Therefore, based on the advantages mentioned above and the benefits of low cost, simple structure, and easy fabrication, the studied Pt NP/AZO structure is suitable to produce high-performance metal-oxide-based ammonia sensors.

Original languageEnglish
Pages (from-to)145-154
Number of pages10
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2018 Aug 15

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


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