Zeolites — Versatile materials for gas sensors

Sahner, Kathy; Hagen, Gunter; Schönauer, Daniela; Reiß, Sebastian; Moos, Ralf

doi:10.1016/j.ssi.2008.08.012

Cited by 130 publications

(90 citation statements)

References 64 publications

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“…The gas sorption capacity of zeolites is very high and, due to their special framework structure, they hold a certain shape-selectivity. Upon gas sorption, zeolite materials are able to change their conductivity (Stamires, 1962;Eigenmann et al, 2000;Sahner et al, 2008), making them potential candidates for dosimeter-type sensors. An example for the dosimeter-type conductivity change is proton conducting H-ZSM-5 adsorbing NH 3 (Simon et al, 1998;Franke et al, 2003;Kubinski and Visser, 2008).…”

Section: Suitable Materials For Accumulating Gas Sensorsmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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Abstract. The aim of this article is to introduce the operation principles of conductometric solid-state dosimeter-type gas sensors, which have found increased attention in the past few years, and to give a literature overview on promising materials for this purpose. Contrary to common gas sensors, gas dosimeters are suitable for directly detecting the dose (also called amount or cumulated or integrated exposure of analyte gases) rather than the actual analyte concentration. Therefore, gas dosimeters are especially suited for low level applications with the main interest on mean values. The applied materials are able to change their electrical properties by selective accumulation of analyte molecules in the sensitive layer. The accumulating or dosimeter-type sensing principle is a promising method for reliable, fast, and long-term detection of low analyte levels. In contrast to common gas sensors, few devices relying on the accumulation principle are described in the literature. Most of the dosimeter-type devices are optical, mass sensitive (quartz microbalance/QMB, surface acoustic wave/SAW), or field-effect transistors. The prevalent focus of this article is, however, on solid-state gas dosimeters that allow a direct readout by measuring the conductance or the impedance, which are both based on materials that change (selectively in ideal materials) their conductivity or dielectric properties with gas loading. This overview also includes different operation modes for the accumulative sensing principle and its unique features.

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Section: Suitable Materials For Accumulating Gas Sensorsmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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“…Several materials with large specific surface areas (SSAs), such as zeolites [1], different polymer membranes [2], carbon nanotubes [3], and TiO 2 nanotubes [4], have been studied as prospective candidates for future gas sensing platforms. Porous silicon (PS) is an especially interesting large SSA material [5], mainly due to its straightforward fabrication method and compatibility with existing silicon-based technology [6].…”

Section: Introductionmentioning

confidence: 99%

Electro-optical porous silicon gas sensor with enhanced selectivity

Jalkanen

Tuura

Mäkilä

et al. 2010

Sensors and Actuators B: Chemical

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“…Due to increasing environmental and economic concerns, the need for inexpensive selective gas sensors is of interest, and zeolite-based materials used in gas sensing have received a great deal of attention [2]. In addition to the adsorptive property, the high surface area and porosity, the presence of mobile ions, the variable chemical composition, and the controllable acidic-basic properties and catalytic activity, zeolites are attractive candidates for numerous applications as chemical sensing materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the adsorptive property, the high surface area and porosity, the presence of mobile ions, the variable chemical composition, and the controllable acidic-basic properties and catalytic activity, zeolites are attractive candidates for numerous applications as chemical sensing materials [3,4]. Some applications of zeolite materials in gas sensors have been developed based on the characteristics mentioned above: (1) assembly of a compound specifically sensing a gas into zeolite cages or channels, (2) fixing of zeolites on quartz crystal microbalances for sensing some gases by selective adsorption, (3) changing the conductivity of zeolites due to the absorbance of some gases for making sensors based on impedance spectroscopy measurements, (4) placing zeolites onto sensors as filter materials for enhancing the selectivity to a certain gaseous molecule, and (5) immersing zeolites into some materials or supports forming composites for making sensors [3].…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity response and sensitivity of ZSM-5, Y, and mordenite zeolites towards ethanol vapor

Yimlamai

Niamlang

Chanthaanont

et al. 2011

Ionics

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This work is an attempt to search for highly selective sensing materials for ethanol vapor. The electrical conductivity response of ZSM-5, Y, and mordenite zeolites towards ethanol vapor have been investigated for the effects of the framework, the charge balancing cation type, and the Si/Al ratio. All zeolites were characterized using XRD, FT-IR, SEM, TGA, BET, and NH 3 -TPD techniques. For the effect of the zeolite framework type, H + Y has a higher electrical conductivity sensitivity value than that of H + MOR because of a greater pore volume and available surface area. For the effect of the charge balancing cation, all NH 4 + ZSM-5 zeolites (Si/Al=23, 50, 80, 280) show negative responses, whereas the H + Y zeolites (Si/Al=30, 60, 80) and the H + MOR zeolites (Si/Al=30, 200) show positive responses. These differing behaviors can be traced to the electrostatic field at the cation sites in zeolite micropores, and their hydrophilic-hydrophobic character, which affect the adsorption properties of the zeolites. For the effect of Si/Al ratio, the electrical conductivity sensitivity towards the ethanol decreases with increasing Si/Al ratio or decreasing Al content, and there is a lesser degree of interaction between ethanol molecules and the active sites of the zeolites due to its higher hydrophobicity and the lower amount of cations. However, the H + Y (Si/Al=5.1) and the H + MOR (Si/Al=19) zeolites have lower conductivity sensitivity than those of H + Y (Si/Al=30) and H + MOR (Si/Al=30), respectively. The interactions between the C 2 H 5 OH molecules and the zeolites with respect to the electrical conductivity sensitivity were investigated and verified through infrared spectroscopy.

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Zeolites — Versatile materials for gas sensors

Cited by 130 publications

References 64 publications

Overview on conductometric solid-state gas dosimeters

Overview on conductometric solid-state gas dosimeters

Electro-optical porous silicon gas sensor with enhanced selectivity

Electrical conductivity response and sensitivity of ZSM-5, Y, and mordenite zeolites towards ethanol vapor

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