Pt-Al2O3 katalytický filtr pro sítotiskem deponovaný WO3 senzor vysoce selektivní na benzen

Pt-loaded Al2O3 catalytic filters for screen-printed WO3 sensors highly selective to benzene

journal article - other

en

We describe the fabrication of low-cost benzene sensors by using screen-printing technology. Two different types of catalytic filters were developed to enhance the sensitivity of tungsten oxide films to benzene. The first type of filter consists of a porous Al2O3 layer, loaded with a Pt layer on its surface. The second type of filter is based on a porous Al2O3 layer, with Pt homogeneously distributed in its bulk. These filters were used to coatWO3-based sensors. The presence of by-products resulting from the incomplete catalytic combustion of benzene in the catalytic filters (that could further interact with the WO3 film), explains the higher sensitivity of the coated sensors, as compared with the sensitivity of bare tungsten oxide sensors. In particular, it is shown that a very selective benzene sensor can be obtained by combining a coated and uncoated tungsten oxide sensor. This combined sensor, selectively detects benzene in a wide concentration range in the presence of interfering species such as ethanol, ammonia, nitrogen dioxide and water vapour.

V této práci je posána výroba levného tlustovrstvého senzoru benzenu realizovaného sítotiskem. Byly vytvořeny dva různé senzory s katalitickým filtrem, který zlepšil citlivost WO3 vrstvy na benzen. Vysoká selektivita senzoru na benzen byla docílena vytvořením rozdílového signálu ze senzoru s čistým WO3 a senzoru s katalitickým filtrem, potlačující odezvu na plyny jako etanol, amoniak, NO2 a vodní páry.

We describe the fabrication of low-cost benzene sensors by using screen-printing technology. Two different types of catalytic filters were developed to enhance the sensitivity of tungsten oxide films to benzene. The first type of filter consists of a porous Al2O3 layer, loaded with a Pt layer on its surface. The second type of filter is based on a porous Al2O3 layer, with Pt homogeneously distributed in its bulk. These filters were used to coatWO3-based sensors. The presence of by-products resulting from the incomplete catalytic combustion of benzene in the catalytic filters (that could further interact with the WO3 film), explains the higher sensitivity of the coated sensors, as compared with the sensitivity of bare tungsten oxide sensors. In particular, it is shown that a very selective benzene sensor can be obtained by combining a coated and uncoated tungsten oxide sensor. This combined sensor, selectively detects benzene in a wide concentration range in the presence of interfering species such as ethanol, ammonia, nitrogen dioxide and water vapour.

Benzene; Metal oxide sensor; Catalytic filter; Tungsten oxide; Alumina; Platinum

2004

07.06.2004

Elsevier

0925-4005

101

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