Zeolite coated interdigital capacitors as a new type of gas sensor

Alberti, K. G. M. M.; Haas, J.; Plog, Carsten; Fetting, F.

doi:10.1016/0920-5861(91)87028-l

Cited by 19 publications

(9 citation statements)

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“…Shape selectively adsorbed molecules with dissimilar polarities should illicit different responses. A version of this concept has been realized in an interdigitized capacitor employing a Y type zeolite coating as the dielectric phase [7,81. Changes in zeolite capacitance upon adsorption of different molecules were recorded in the picofarad range.…”

Section: Introductionmentioning

confidence: 99%

Molecular Sieve Based Chemical Sensors

Balkus

Sottile²,

Nguyen³

et al. 1994

MRS Proc.

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By virtue of their shape selectivity and stability, molecular sieves are ideal components for discriminating chemical sensors. In this paper we report the preparation of capacitance type sensors based on aluminum phosphate molecular sieves. Thin films of the molecular sieves AlPO 4 -5, A1PO 4 -H3 and AlPO 4 -Hl, which cover a range of pore dimensions, were deposited on titanium nitride coated silicon wafers by laser ablation. A subsequent hydrothermal treatment followed by a Pd/Au coating and the application of standard photoresist/masking techniques were used to generate the capacitors. The molecular sieves exhibit significant changes in capacitance upon exposure to target molecules, including CO 2 , CO, N 2 , H 2 0 and toluene.

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Section: Introductionmentioning

confidence: 99%

Molecular Sieve Based Chemical Sensors

Balkus

Sottile²,

Nguyen³

et al. 1994

MRS Proc.

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“…Zeolites have been proposed as filters operating continuously at a molecular scale − and as high-performance chemical sensors. , Inclusion chemistry has opened additional perspectives for these materials. The zeolite framework has been utilized as a host for polymer molecular wires, , semiconductor and metal clusters, , and organic species .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Oriented Zeolite Membranes at the Interface between Two Fluid Phases

1997

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A method was developed for the synthesis of free-standing silicalite-1 membranes. Intergrown polycrystalline films were synthesized at the interface between a colloid-free aqueous phase and an organic phase or air. These films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the crystallites of the films formed at the air-water interface were oriented with their (010) axis orthogonal to the interface.

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“…The weight loss is 2.723% is observed in second step in the temperature range of 400K to 600K. This weight loss seems to be due to decomposition of (Tetra Ethyl Ammonium) TEA + ions and mobile water coming out of zeolite cavities [21]. The weight loss of 0.55% is observed in third step, when is in the temperature range 600K to 873K.…”

Section: Methodsmentioning

confidence: 83%

“…Other peaks have been observed at 368K, 433K, 468K but the percent sensitivity factor is less than 49 % (Table1). Several studies have been reported on changes of the complex impedance of zeolite when exposed to hydrocarbons [21,22]. It was found that conductivity of sensing material increases with increasing hydrocarbon contents [23].Marginal higher temperatures enhance ion mobility in the zeolite lattice leading to a marginal higher value of conductivity.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Conductivity based Silver Modified ZSM5 & Beta Zeolites as a LPG and CO2 Gas Sensor

2016

IJSR

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Zeolites are the gas sensing materials. The microspores of H-Zeolite Socony Mobil-Five (H-ZSM5) and H-Beta zeolites are modified with metal Silver Nitrate (AgNO 3 ) by ion exchange method. The modified Silver-ZSM5 (Ag-ZSM5) and Silver-Beta (Ag-Beta) are characterized by X-Ray Diffraction (XRD), Infrared (IR) Spectroscopy, Thermo Gravimetric Analysis (TGA), Differential Thermal Analysis(DTA), Scanning Electron Microscopy (SEM), Energy Dispersive Analysis of X-Ray (EDAX) techniques. Gas sensing characteristics of Ag-ZSM5 and Ag-Beta zeolite have been studied for Liquified Petroleum Gas (LPG) gas and Carbon dioxide (CO 2 ) gas. The gas sensing properties of Ag-ZSM5 and Ag-Beta zeolite are studied in a static gas characterization system. Adsorption of gas molecules in zeolite changes the ionic activity, which interns changes conductivity. The maximum Percent Sensitivity Factor (PSF) is measured as a function of operating temperature and as a function of gas concentration for LPG and CO 2 gas.

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Zeolite coated interdigital capacitors as a new type of gas sensor

Cited by 19 publications

References 0 publications

Molecular Sieve Based Chemical Sensors

Molecular Sieve Based Chemical Sensors

Synthesis of Oriented Zeolite Membranes at the Interface between Two Fluid Phases

Comparative Study of Conductivity based Silver Modified ZSM5 & Beta Zeolites as a LPG and CO2 Gas Sensor

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