Flexible atmospheric-pressure gas ionization sensors with horizontally aligned carbon nanotube electrodes

Kuang Yu Wang*, Wan Lin Tsai, Po Yu Yang, Chia Hsin Chou, Chan Yu Liao, Yu Ren Li, Huang-Chung Cheng

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations


A flexible atmospheric-pressure gas ionization sensor (GIS) with the horizontally aligned carbon nanotube (HACNT) electrodes in the planar structure has been demonstrated for the first time via the proposed rolling-down technique of CNTs. The gap between the electrodes of high-density and uniform HACNTs could be therefore precisely controlled via adjusting the length of the CNTs and the interspacing between the patterned catalysts. High-performance sensing characteristics to various gases Ar, N2, air, and O2 at atmospheric pressure with the breakdown voltages as low as 160, 193, 205, and 233, respectively, have been achieved with the electrode gap of 20 μm. It is attributed to the field enhancement from the small gap and the double-side nanostructures. The superior flexibility of the proposed GIS with different bending tests has also been obtained. It reflects that the HACNTs possess excellent material properties, including great mechanical strength and good electrical conductivity. Such a simple, low-cost, and flexible GIS is promising for its applications in portable and wearable personal monitoring devices.

Original languageEnglish
Pages (from-to)12860-12865
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Issue number12
StatePublished - 1 Dec 2016


  • Gas ionization sensor
  • Horizontally aligned carbon nanotube
  • PDMS

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