Simple fabrication process for 2D ZnO nanowalls and their potential application as a methane sensor

Tse Pu Chen, Sheng Po Chang, Fei Yi Hung, Shoou Jinn Chang, Zhan Shuo Hu, Kuan Jen Chen

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


Two-dimensional (2D) ZnO nanowalls were prepared on a glass substrate by a low-temperature thermal evaporation method, in which the fabrication process did not use a metal catalyst or the pre-deposition of a ZnO seed layer on the substrate. The nanowalls were characterized for their surface morphology, and the structural and optical properties were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and photoluminescence (PL). The fabricated ZnO nanowalls have many advantages, such as low growth temperature and good crystal quality, while being fast, low cost, and easy to fabricate. Methane sensor measurements of the ZnO nanowalls show a high sensitivity to methane gas, and rapid response and recovery times. These unique characteristics are attributed to the high surface-to-volume ratio of the ZnO nanowalls. Thus, the ZnO nanowall methane sensor is a potential gas sensor candidate owing to its good performance.

Original languageEnglish
Pages (from-to)3941-3950
Number of pages10
JournalSensors (Switzerland)
Issue number3
Publication statusPublished - 2013 Mar

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering


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