Necked ZnO nanoparticle-based NO2 sensors with high and fast response

Jin Hyung Jun, Junggwon Yun, Kyoungah Cho, In Sung Hwang, Jong Heun Lee, Sangsig Kim

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


The NO2 gas sensing characteristics of semiconductor type gas sensors with channels composed of necked ZnO nanoparticles (NPs) were investigated in this study. The heat treatment of the NPs at 400 °C led to their necking and coarsening. The response of the necked-NP-based sensors was as high as 100 when exposed to 0.2 ppm of NO2 at 200 °C. As the concentration of NO2 increased to 5 ppm, their response was enhanced to approximately 400. During the repeated injection of NO2 gas with a concentration of 0.4 ppm, the sensors exhibited stable response characteristics. Furthermore, the 90% response and recovery times of the gas sensor were as fast as 13 and 10 s, respectively. These observations indicate that the non-agglomerated necking of the NPs induced by the heat treatment significantly enhances the gas sensing characteristics of the NP-based gas sensors.

Original languageEnglish
Pages (from-to)412-417
Number of pages6
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 2009 Jul 16


  • Gas sensor
  • NO
  • Non-agglomerated necking
  • Response
  • ZnO nanoparticles

ASJC Scopus subject areas

  • 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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