Detail publikace

A route toward more selective and less humidity sensitive screen-printed SnO2 and WO3 gas sensitive layers

IVANOV, P. HUBÁLEK, J. MALYSZ, K. PRÁŠEK, J. VILANOVA, X. LLOBET, E. CORREIG, X.

Originální název

A route toward more selective and less humidity sensitive screen-printed SnO2 and WO3 gas sensitive layers

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

We have studied the effect of adhesion promoters (bismuth and copper oxides) on the gas sensing properties of screen-printed tin and tungsten oxide sensors. The gas-sensitive pastes were prepared by mixing either tin or tungsten oxide powders with an organic vehicle based on therpineol. Two different additives to enhance the adhesion of the active films to the substrate (Bi2O3 or Bi2O3 + Cu2O) were included in the paste composition. The films that resulted after printing and firing have high porosity and excellent adherence. Morphology studies have shown that the films have well-defined microstructure and gas sensitivity studies have shown that additives, not only help in promoting film adhesion, but also modify the response of the sensors. Their sensitivity at different operating temperatures was evaluated for ammonia, nitrogen dioxide, ethanol, benzene, carbon monoxide, methane and water vapour. While WO3 sensors were, in general, highly responsive to ammonia and nitrogen dioxide, SnO2 sensors were highly responsive to ethanol. It was found that WO3 sensors containing Bi2O3 and Cu2O were always more sensitive to ammonia and, that WO3 sensors containing Bi2O3 only were more sensitive to nitrogen dioxide when operated at 250oC. This suggests that the inclusion of small amounts of bismuth and cooper oxides can be a route to obtain tungsten oxide sensors with high selectivity for ammonia or nitrogen dioxide.

Klíčová slova

gas sensor, screen-printing, tin dioxide, tungsten trioxide, bismuth and copper oxides

Autoři

IVANOV, P.; HUBÁLEK, J.; MALYSZ, K.; PRÁŠEK, J.; VILANOVA, X.; LLOBET, E.; CORREIG, X.

Rok RIV

2004

Vydáno

1. 1. 2004

Nakladatel

Elsevier

ISSN

0925-4005

Periodikum

Sensors and Actuators B: Chemical

Ročník

100

Číslo

1-2

Stát

Švýcarská konfederace

Strany od

221

Strany do

227

Strany počet

7

URL

http://www.elsevier.com

BibTex

@article{BUT41343,
  author="Peter {Ivanov} and Jaromír {Hubálek} and Karel {Malysz} and Jan {Prášek} and Xavier {Vilanova} and Eduard {Llobet} and Xavier {Correig}",
  title="A route toward more selective and less humidity sensitive screen-printed SnO2 and WO3 gas sensitive layers",
  journal="Sensors and Actuators B: Chemical",
  year="2004",
  volume="100",
  number="1-2",
  pages="221--227",
  issn="0925-4005",
  url="http://www.elsevier.com"
}