Abstract
Zeolites are promising materials in the field of gas sensors. In this technology-oriented paper, a planar setup for potentiometric hydrocarbon and hydrogen gas sensors using zeolites as ionic sodium conductors is presented, in which the Pt-loaded Na-ZSM-5 zeolite is applied using a thick-film technique between two interdigitated gold electrodes and one of them is selectively covered for the first time by an electroplated chromium oxide film. The influence of the sensor temperature, the type of hydrocarbons, the zeolite film thickness, and the chromium oxide film thickness is investigated. The influence of the zeolite on the sensor response is briefly discussed in the light of studies dealing with zeolites as selectivity-enhancing cover layers.
Highlights
Zeolites are microporous, crystalline aluminosilicate materials with an enormous inner surface
Sensors for that purpose were covered with one zeolite layer
Zeolites were loaded with 1, 2, and 3 wt% Pt and all were reduced in hydrogen
Summary
Crystalline aluminosilicate materials with an enormous inner surface. Their special framework structure and their associated unique physicochemical properties make them an interesting class of materials that is used for catalysts [1], ion exchangers [2], and gas adsorbers, for instance, in automotive exhaust gas aftertreatment applications [3]. [AlO4]5− tetrahedra with the metal ion in the centre being linked to oxygen corners. Sensors 2011, 11 silicate framework is uncharged, but an aluminosilicate framework comprises one negative charge per [AlO4]5− tetrahedron [4]. To compensate the negative charge, mobile exchangeable cations, e.g., Na+, K+ or Ca2+, are incorporated into the zeolite lattice. The general chemical formula of zeolites is:
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