Reactivity, Electronic Structure and Geometry of Nonpolar Zincoxide Surfaces

Göpel, Wolfgang

doi:10.1002/bbpc.19780820715

Cited by 30 publications

(2 citation statements)

References 122 publications

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“…Gurlo and R. Riedel Reviews 3832 www.angewandte.org UHV). [91,116] Most of these investigations involved ZnO (see, for example, reference [116] and the summary in references [115,117]), TiO 2 (see, for example, reference [118] and the summary in references [115,117]), and SnO 2 (see, for example, references [88,91,119]), and it was mainly through work on these materials that the understanding of gas-oxide interactions was advanced at that time.…”

Section: Ionosorption Modelmentioning

confidence: 99%

In Situ and Operando Spectroscopy for Assessing Mechanisms of Gas Sensing

2007

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The mechanistic description of gas sensing on inorganic, organic, and polymeric materials is of great scientific and technological interest. The understanding of surface and bulk reactions responsible for gas-sensing effects will lead to increased selectivity and sensitivity in the chemical determination of gases and thus to the development of better sensors. In recent years, spectroscopic tools have been developed to follow the physicochemical processes taking place in an active sensing element in real time and under operating conditions. Thus, the monitoring of the processes in "living" gas sensors is no longer an unsolvable problem. This Review gives an overview of in situ and operando spectroscopic techniques for the study of gas-sensing mechanisms on solid-state sensors.

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Section: Ionosorption Modelmentioning

confidence: 99%

In Situ and Operando Spectroscopy for Assessing Mechanisms of Gas Sensing

2007

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“…We recall here that the ZnO lattice has a very open structure with straight channels located on the apolar faces (0701) of 0.2 nm diameter separated by a trigonal squeeze point of 0.12 nm through which a hydrogen atom or even a molecule can easily penetrate into the bulk.zz, 23 The squeeze point can account for the extreme slowness of the process and its substantial irreversibility. A schematic diagram for energy relationships in such a system is reported in fig.…”

Section: E N E R G Y Of I N T E R a C T I O N Of H On Znomentioning

confidence: 99%

Adsorption of hydrogen on zinc oxide. Energy of interaction and related mechanisms

Fubini¹,

Giamello²,

Gatta³

et al. 1982

J. Chem. Soc., Faraday Trans. 1

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The heat of adsorption of hydrogen on zinc oxide (Kadox 25) has been measured at room temperature using a Calvet microcalorimeter.Two main forms of adsorbed hydrogen have been found, coinciding with the literature types I and 11. Both always occur simultaneously (although with different kinetics) and a clear-cut separation between the two forms is not achieved on the basis of their reversibility. Differential heats of adsorption decrease with coverage from 60 to 14 kJ mol-*. Apart from the lowest coverages, where a real heterogeneity in site energies is present, the decrease is basically due to the simultaneous adsorption of type I (ca. 40 kJ mol-I) and type I1 (ca. 14 kJ mol-l), the latter prevailing at increasing coverage. The surprising feature that the 'irreversible' type I1 has a lower adsorption heat than the reversible type I is interpreted as evidence for diffusion of the adsorbate into the bulk, in agreement with kinetic observations.

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In‐situ‐ und Operando‐Spektroskopie zur Untersuchung von Mechanismen der Gaserkennung

Gurlo

Riedel

2007

Angewandte Chemie

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Der Mechanismus der Gaserkennung auf anorganischen, organischen und polymeren Materialien ist von großem wissenschaftlichem und technologischem Interesse. Die Aufklärung der Reaktionen an der Oberfläche und in der Volumenphase, die an der Gaserkennung beteiligt sind, wird zu einer selektiveren und empfindlicheren chemischen Bestimmung von Gasen und somit zur Entwicklung besserer Sensoren führen. In den vergangenen Jahren sind Methoden entwickelt worden, mit deren Hilfe physikochemische Prozesse in einem aktiven Sensor unter Arbeitsbedingungen und in Echtzeit verfolgt werden können. Damit ist das Verfolgen der Prozesse in arbeitenden Gassensoren heute kein unlösbares Problem mehr. Der vorliegende Aufsatz gibt einen Überblick zu diesen In‐situ‐ und Operando‐Spektroskopietechniken für Untersuchungen zum Mechanismus der Gaserkennung auf Festkörpern.

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Reactivity, Electronic Structure and Geometry of Nonpolar Zincoxide Surfaces

Cited by 30 publications

References 122 publications

In Situ and Operando Spectroscopy for Assessing Mechanisms of Gas Sensing

In Situ and Operando Spectroscopy for Assessing Mechanisms of Gas Sensing

Adsorption of hydrogen on zinc oxide. Energy of interaction and related mechanisms

In‐situ‐ und Operando‐Spektroskopie zur Untersuchung von Mechanismen der Gaserkennung

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