NH3 sensitive chemiresistor sensors using plasma functionalized multiwall carbon nanotubes/conducting polymer composites

Tai Jin Kim, Si Dong Kim, Nam Ki Min, James Jungho Pak, Cheol Jin Lee, Soo-Won Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


We present a micromachined NH3 chemiresistor sensor based on O2 plasma functionalized multiwall carbon nanotube (MWCNT)/ conducting polymer (CP) composites, and discuss its gas sensing mechanism. The FTIR spectra of plasma-treated MWCNTs indicate that oxygenated groups are created on the surface of CNTs after the plasma treatment. The plasma-functionalized MWCNT/PANI sensor exhibits a linear response of 3.34% per ppm NH3 for concentrations ranging from 10 to 100 ppm, and a sensitivity of about 7 times higher than that from a corresponding pristine MWCNT sensor. This dramatic change in resistance is attributed to the fact that the binding of the functional group with the defective CNT is stronger than that with the perfect one.

Original languageEnglish
Title of host publicationProceedings of IEEE Sensors
Number of pages4
Publication statusPublished - 2008 Dec 1
Event2008 IEEE Sensors, SENSORS 2008 - Lecce, Italy
Duration: 2008 Oct 262009 Oct 29


Other2008 IEEE Sensors, SENSORS 2008


ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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