Experimental studies of O2–SnO2 surface interaction using powder, thick films and monocrystalline thin films

Saukko, Sami; Lassi, Ulla; Lantto, V.; Kroneld, M.; Новиков, С. В.; Kuivalainen, P.; Rantala, Tapio T.; Mizsei, J.

doi:10.1016/j.tsf.2005.04.012

Cited by 27 publications

(22 citation statements)

References 15 publications

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“…In this case the high-temperature peak b is not observed on TPD curves; [95] this peak is attributed to the superoxid anion, O 2 À ;…”

Section: Temperature Programmed Desorptionmentioning

confidence: 89%

“…Simultaneously with this desorption peak conductance starts to increase. [84,95] In conditions responsible for the appearance of this peak no EPR signals of paramagnetic oxygen species are observed. Similar findings have also been reported for ZnO [47,93,96] and TiO 2 , [93] where the low-temperature peaks assigned to the superoxide ion are observed only after RT oxygen adsorption on the pre-reduced oxide.…”

Section: Temperature Programmed Desorptionmentioning

confidence: 96%

“…Much effort has been made to correlate the results of the TPD studies on SnO 2 [84,85,[92][93][94][95] with the changes in electrical conductivity, and assign observed TPD peaks to different oxygen species using EPR spectroscopy. In several works, TPD was done in combination with/in parallel to 1) EPR and electrical conductivity, [84] 2) EPR, [93] 3) DC conductance (on thick film samples) and CPD (on films), [95] 4) electrical conductivity.…”

Section: Temperature Programmed Desorptionmentioning

confidence: 99%

“…In several works, TPD was done in combination with/in parallel to 1) EPR and electrical conductivity, [84] 2) EPR, [93] 3) DC conductance (on thick film samples) and CPD (on films), [95] 4) electrical conductivity. [92] In the temperature region of interest (below 700 8C), up to four different desorption peaks are observed (Table 2, Figure 10).…”

Section: Temperature Programmed Desorptionmentioning

confidence: 99%

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Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

2006

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Tin dioxide is the most commonly used material in commercial gas sensors based on semiconducting metal oxides. Despite intensive efforts, the mechanism responsible for gas-sensing effects on SnO(2) is not fully understood. The key step is the understanding of the electronic response of SnO(2) in the presence of background oxygen. For a long time, oxygen interaction with SnO(2) has been treated within the framework of the "ionosorption theory". The adsorbed oxygen species have been regarded as free oxygen ions electrostatically stabilized on the surface (with no local chemical bond formation). A contradiction, however, arises when connecting this scenario to spectroscopic findings. Despite trying for a long time, there has not been any convincing spectroscopic evidence for "ionosorbed" oxygen species. Neither superoxide ions O(2)(-), nor charged atomic oxygen O,(-) nor peroxide ions O(2)(2-) have been observed on SnO(2) under the real working conditions of sensors. Moreover, several findings show that the superoxide ion does not undergo transformations into charged atomic oxygen at the surface, and represents a dead-end form of low-temperature oxygen adsorption on reduced metal oxide.

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“…In this case the high-temperature peak b is not observed on TPD curves; [95] this peak is attributed to the superoxid anion, O 2 À ;…”

Section: Temperature Programmed Desorptionmentioning

confidence: 89%

Section: Temperature Programmed Desorptionmentioning

confidence: 96%

Section: Temperature Programmed Desorptionmentioning

confidence: 99%

Section: Temperature Programmed Desorptionmentioning

confidence: 99%

See 2 more Smart Citations

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

2006

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“…single crystals!) (see, for example, references [128][129][130] and review article in reference [86]) as well as the simultaneous conductance and temperature-programmed desorption (TPD) [131] investigations can be attributed to surface-science methodology. .…”

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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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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Experimental studies of O2–SnO2 surface interaction using powder, thick films and monocrystalline thin films

Cited by 27 publications

References 15 publications

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

In Situ and Operando Spectroscopy for Assessing Mechanisms of Gas Sensing

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

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Experimental studies of O2–SnO2 surface interaction using powder, thick films and monocrystalline thin films

Cited by 27 publications

References 15 publications

Interplay between O2 and SnO2: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

Interplay between O2 and SnO2: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

In Situ and Operando Spectroscopy for Assessing Mechanisms of Gas Sensing

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

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Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen