Gas sensing properties of single-wall carbon nanotubes dispersed with dimethylformamide

Kyongsoo Lee, Jin Woo Lee, Ki Young Dong, Byeong Kwon Ju

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

For NO2 gas sensing, we deposited single-walled carbon nanotubes (SWCNTs) on a pair of interdigitated electrodes (IDEs) by using a simple casting method. In order to achieve well-dispersed SWCNTs, we dispersed the as-grown SWCNT powder into dimethylformamide (DMF). We selected DMF as one of the candidate materials to ravel the entangled SWCNT bundles because the amide group could easily attach to the surface of the nanotubes. The resultant SWCNTs were well separated. However, the SWCNTs dispersed in DMF required a heat treatment to eliminate the DMF molecules adsorbed on the surface of the SWCNTs. Therefore, we heated the SWCNTs on the IDEs to 350 °C for 1, 2, 3, and 5 h, to remove the outer DMF adsorbed layers. The assembled sensors were exposed to NO2 of 3 and 10 ppm concentrations. We attributed the NO2 gas sensing to the direct charge transfer from the physically adsorbed molecules to the individual p-type semiconducting SWCNTs.

Original languageEnglish
Pages (from-to)214-218
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume135
Issue number1
DOIs
Publication statusPublished - 2008 Dec 10

Fingerprint

Dimethylformamide
Carbon Nanotubes
Single-walled carbon nanotubes (SWCN)
Carbon nanotubes
Gases
carbon nanotubes
gases
Electrodes
Molecules
electrodes
Amides
Powders
Nanotubes
amides
bundles
Charge transfer
molecules
nanotubes
Casting
heat treatment

Keywords

  • Carbon nanotube
  • Dimethylformamide
  • Gas sensor
  • Nitrogen dioxide

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Gas sensing properties of single-wall carbon nanotubes dispersed with dimethylformamide. / Lee, Kyongsoo; Lee, Jin Woo; Dong, Ki Young; Ju, Byeong Kwon.

In: Sensors and Actuators, B: Chemical, Vol. 135, No. 1, 10.12.2008, p. 214-218.

Research output: Contribution to journalArticle

Lee, Kyongsoo ; Lee, Jin Woo ; Dong, Ki Young ; Ju, Byeong Kwon. / Gas sensing properties of single-wall carbon nanotubes dispersed with dimethylformamide. In: Sensors and Actuators, B: Chemical. 2008 ; Vol. 135, No. 1. pp. 214-218.
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