CobaltMaghrebV1, France, Analysis, bibRecord, 000067

Role of the active layer thickness on the sensitivity of WO3 gas sensors

Identifieur interne : 000067 ( France/Analysis ); précédent : 000066; suivant : 000068

Role of the active layer thickness on the sensitivity of WO3 gas sensors

Auteurs : K. Aguir [France] ; J. Guerin [France] ; N. Mliki [Tunisie] ; M. Bendahan [France]

Source :

International journal of nanotechnology [ 1475-7435 ] ; 2012.

RBID : Pascal:12-0133012

Descripteurs français

Pascal (Inist)
- Couche active, Epaisseur couche, Capteur de gaz, Matériau capteur, Couche épaisse, Addition béryllium, Couche superficielle, Cobalt, Effet dimensionnel, Sélectivité, Modélisation, Etude théorique, Polycristal, Semiconducteur, Couche mince, Nanomatériau, WO3, SnO2, CuO, ZnO, Substrat cobalt, 0707D, 8107B.
Wicri :
- topic : Cobalt.

English descriptors

KwdEn :
- Active layer, Beryllium additions, Cobalt, Gas sensors, Layer thickness, Modelling, Nanostructured materials, Polycrystals, Selectivity, Semiconductor materials, Sensor materials, Size effect, Surface layers, Theoretical study, Thick films, Thin films.

Abstract

Sensitive materials in gas sensors are often polycrystalline semiconducting oxides such as WO₃, SnO₂, CuO or ZnO. They are most often composed of nanometric grains. They can be deposited either as thin or thick films. The film thickness plays an important role in the response stability and sensitivity of sensors. It is now well accepted that the relationship between the surface and volume of the sensitive layer plays a major role in the efficiency of detection. Many experimental and theoretical works were reported in explaining the experimental sensitivity vs. thickness relationships reported for the gas sensors prepared by different fabrication techniques. In addition, significant changes can be expected by adding catalytic nanograins in small quantities on the surface of the sensitive layers. For example, cobalt nanograins deposited on the surface of WO₃ sensors produce an important change in the WO₃ conductance. Indeed, cobalt changes the conduction type of the sensors from n- to p-type. This paper describes the effect of reducing the size of the sensors and nanostructured sensitive materials on the sensor response.

Affiliations:

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Pascal:12-0133012

Le document en format XML

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<term>Layer thickness</term>
<term>Modelling</term>
<term>Nanostructured materials</term>
<term>Polycrystals</term>
<term>Selectivity</term>
<term>Semiconductor materials</term>
<term>Sensor materials</term>
<term>Size effect</term>
<term>Surface layers</term>
<term>Theoretical study</term>
<term>Thick films</term>
<term>Thin films</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Couche active</term>
<term>Epaisseur couche</term>
<term>Capteur de gaz</term>
<term>Matériau capteur</term>
<term>Couche épaisse</term>
<term>Addition béryllium</term>
<term>Couche superficielle</term>
<term>Cobalt</term>
<term>Effet dimensionnel</term>
<term>Sélectivité</term>
<term>Modélisation</term>
<term>Etude théorique</term>
<term>Polycristal</term>
<term>Semiconducteur</term>
<term>Couche mince</term>
<term>Nanomatériau</term>
<term>WO3</term>
<term>SnO2</term>
<term>CuO</term>
<term>ZnO</term>
<term>Substrat cobalt</term>
<term>0707D</term>
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<front><div type="abstract" xml:lang="en">Sensitive materials in gas sensors are often polycrystalline semiconducting oxides such as WO<sub>3</sub>
, SnO<sub>2</sub>
, CuO or ZnO. They are most often composed of nanometric grains. They can be deposited either as thin or thick films. The film thickness plays an important role in the response stability and sensitivity of sensors. It is now well accepted that the relationship between the surface and volume of the sensitive layer plays a major role in the efficiency of detection. Many experimental and theoretical works were reported in explaining the experimental sensitivity vs. thickness relationships reported for the gas sensors prepared by different fabrication techniques. In addition, significant changes can be expected by adding catalytic nanograins in small quantities on the surface of the sensitive layers. For example, cobalt nanograins deposited on the surface of WO<sub>3</sub>
 sensors produce an important change in the WO<sub>3</sub>
 conductance. Indeed, cobalt changes the conduction type of the sensors from n- to p-type. This paper describes the effect of reducing the size of the sensors and nanostructured sensitive materials on the sensor response.</div>
</front>
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Role of the active layer thickness on the sensitivity of WO3 gas sensors

Role of the active layer thickness on the sensitivity of WO3 gas sensors

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri