Novel hexagonal WO3 nanopowder with metal decorated carbon nanotubes as NO2 gas sensor

C. Balázsi, Katarína Sedlácková, Eduard Llobet, Radu Ionescu

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

In this work, hexagonal tungsten oxide (hex-WO3) nanopowders were prepared by acidic precipitation from a sodium tungstate solution. TEM analysis of nanopowders showed that the average size of the hexagonal nanoparticles was 50-100 nm. Novel hybrid composites were fabricated by embedding a low amount of carbon nanotubes into the hex-WO3 matrix. Metallic nanoclusters (Ag, Au) were added to the carbon nanotubes for improving the gas sensing properties of the films. The addition of MWCNTs lowered the temperature range of sensitivity of the hex-WO3 nanocomposites to NO2 hazardous gas. In comparison, the sensitivity of hex-WO3 to NO2 was in the temperature range between 150 °C and 250 °C, while the hex-WO3/MWCNTs composites were sensitive to NO2 gas at room temperature.

Original languageEnglish
Pages (from-to)151-155
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume133
Issue number1
DOIs
Publication statusPublished - Jul 28 2008

Fingerprint

Carbon Nanotubes
Chemical sensors
Carbon nanotubes
Gases
Metals
carbon nanotubes
sensors
gases
metals
hybrid composites
tungsten oxides
tungstates
Nanoclusters
Composite materials
nanoclusters
Temperature
embedding
Tungsten
Nanocomposites
nanocomposites

Keywords

  • Carbon nanotube
  • Hexagonal WO
  • Sensing properties
  • TEM

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Novel hexagonal WO3 nanopowder with metal decorated carbon nanotubes as NO2 gas sensor. / Balázsi, C.; Sedlácková, Katarína; Llobet, Eduard; Ionescu, Radu.

In: Sensors and Actuators, B: Chemical, Vol. 133, No. 1, 28.07.2008, p. 151-155.

Research output: Contribution to journalArticle

Balázsi, C. ; Sedlácková, Katarína ; Llobet, Eduard ; Ionescu, Radu. / Novel hexagonal WO3 nanopowder with metal decorated carbon nanotubes as NO2 gas sensor. In: Sensors and Actuators, B: Chemical. 2008 ; Vol. 133, No. 1. pp. 151-155.
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