Integrated impedance based hydrocarbon gas sensors with Na-zeolite/Cr2O3 thin film interfaces: Electrochemical mechanism of the impedance changes

被引：5

作者：

Dubbe, Andreas ^{[1
]}

机构：

[1] Univ Bayreuth, Chair Funct Mat, D-95440 Bayreuth, Germany

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2011年 / 208卷 / 02期

关键词：

electrochemistry; gas sensors; impedance; ion insertion; thin films; zeolites; ZEOLITE; CONDUCTIVITY; SPECTROSCOPY; ELECTROLYTE; COMBUSTION; ADSORPTION; CRYSTALS; CR2O3;

D O I：

10.1002/pssa.201026416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study aims to clarify the mechanism of a hydrocarbon gas sensor effect, which involves impedance changes of a Na+ ion conducting Pt-doped zeolite layer in contact with chromia (Cr2O3) films as electrodes. Based on our previous studies on sensing characteristics and model experiments with asymmetrical cells, a coherent picture of the sensing mechanism is derived: The impedance change is attributed to the process of Na+ ion insertion from the zeolite into the chromia film. The impedance of this interface process is a function of the electrical potential at the interface. Combined with the observation that gas sorption in the zeolite micropores causes changes of the electrochemical potential at the zeolite surface, these two effects explain the observed sensor effect. The sensor response as predicted from this theory agrees well with the experimental data of the original sensor. Implications for the development of integrated devices are discussed. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：416 / 424

页数：9

共 42 条

[1] ZEOLITES AS SENSITIVE MATERIALS FOR DIELECTRIC GAS SENSORS [J].

ALBERTI, K ;

FETTING, F .

SENSORS AND ACTUATORS B-CHEMICAL, 1994, 21 (01) :39-50

[2] A capacitance type chemical sensor based on AlPO4-5 molecular sieves [J].

Balkus, KJ ;

Ball, LJ ;

Gnade, BE ;

Anthony, JM .

CHEMISTRY OF MATERIALS, 1997, 9 (01) :380-386

[3]

Barsoukov E, 2005, IMPEDANCE SPECTROSCOPY: THEORY, EXPERIMENT, AND APPLICATIONS, 2ND EDITION, pXII

[4] GENERAL HYPOTHESIS ON ZEOLITES PHYSICOCHEMICAL PROPERTIES - APPLICATIONS TO ADSORPTION, ACIDITY, CATALYSIS, AND ELECTROCHEMISTRY [J].

BARTHOMEUF, D .

JOURNAL OF PHYSICAL CHEMISTRY, 1979, 83 (02) :249-256

[5] ELECTRIC CONDUCTIVITY AND CATALYTIC ACTIVITY OF SEMICONDUCTING OXIDE CATALYSTS [J].

BIELANSKI, A ;

DEREN, J ;

HABER, J .

NATURE, 1957, 179 (4561) :668-679

[6]

BIRKHOFER T, 2004, Patent No. 10308799

[7] STUDY OF THE NAXCRO2 AND NAXNIO2 SYSTEMS BY ELECTROCHEMICAL DESINTERCALATION [J].

BRACONNIER, JJ ;

DELMAS, C ;

HAGENMULLER, P .

MATERIALS RESEARCH BULLETIN, 1982, 17 (08) :993-1000

[8] SOLID IONIC CONDUCTOR SEMICONDUCTOR JUNCTIONS FOR CHEMICAL SENSORS [J].

BREDIKHIN, S ;

LIU, J ;

WEPPNER, W .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 1993, 57 (01) :37-43

[9]

DELMAS C, 1982, REV CHIM MINER, V19, P343

[10] Solid electrolyte hydrocarbon gas sensor using zeolite as the sensitive phase [J].

Dubbe, A ;

Moos, R .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2006, 9 (05) :H31-H34

← 1 2 3 4 5 →