TPD and ITPD study of materials used as chemoresistive gas sensors

Puzzovio, D.; Carotta, M.C.; Cervi, A.; Hachimi, A.; Joly, Jean‐Pierre; Guidi, V.

doi:10.1016/j.ssi.2009.10.007

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…Depending on the operational temperature, one or more of these adsorbed oxygen species will be in a dynamic equilibrium with the environment. The presence of

in the dynamic adsorption-desorption process is observed up to 500 °C [ 21 , 25 , 26 , 27 ]. Above 500 °C, it is reported that there are multiple dynamic equilibriums under certain specific oxygen partial pressures.…”

Section: Overview Of Adsorbed Oxygen From the Viewpoint Of Gas Sensor...mentioning

confidence: 99%

“…Thus, it is vital to characterize oxygen stoichiometry on the surface. Chemical sensor researchers mainly collect the required analytical-spectral-microscopic tools, employing the techniques given in the succeeding paragraphs and detailed in Table 1 [ 21 , 26 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ]. The full names of each technique detailed in Table 1 is given in the in Abbreviations section at the end of the paper.…”

Section: Review Of Analytical-spectral-microscopic Tools For Semicond...mentioning

confidence: 99%

See 1 more Smart Citation

Adsorbed Oxygen Ions and Oxygen Vacancies: Their Concentration and Distribution in Metal Oxide Chemical Sensors and Influencing Role in Sensitivity and Sensing Mechanisms

Çiftyürek

Schierbaum

2022

Sensors

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Oxidation reactions on semiconducting metal oxide (SMOs) surfaces have been extensively worked on in catalysis, fuel cells, and sensors. SMOs engage powerfully in energy-related applications such as batteries, supercapacitors, solid oxide fuel cells (SOFCs), and sensors. A deep understanding of SMO surface and oxygen interactions and defect engineering has become significant because all of the above-mentioned applications are based on the adsorption/absorption and consumption/transportation of adsorbed (physisorbed-chemisorbed) oxygen. More understanding of adsorbed oxygen and oxygen vacancies (VO•,VO••) is needed, as the former is the vital requirement for sensing chemical reactions, while the latter facilitates the replenishment of adsorbed oxygen ions on the surface. We determined the relation between sensor response (sensitivity) and the amounts of adsorbed oxygen ions (O2ads−, Oads, −O2ads2−, Oads2−), water/hydroxide groups (H2O/OH−), oxygen vacancies (VO•, VO••), and ordinary lattice oxygen ions (Olattice2−) as a function of temperature. During hydrogen (H2) testing, the different oxidation states (W6+, W5+, and W4+) of WO3 were quantified and correlated with oxygen vacancy formation (VO•, VO••). We used a combined application of XPS, UPS, XPEEM-LEEM, and chemical, electrical, and sensory analysis for H2 sensing. The sensor response was extraordinarily high: 424 against H2 at a temperature of 250 °C was recorded and explained on the basis of defect engineering, including oxygen vacancies and chemisorbed oxygen ions and surface stoichiometry of WO3. We established a correlation between the H2 sensing mechanism of WO3, sensor signal magnitude, the amount of adsorbed oxygen ions, and sensor testing temperature. This paper also provides a review of the detection, quantification, and identification of different adsorbed oxygen species. The different surface and bulk-sensitive characterization techniques relevant to analyzing the SMOs-based sensor are tabulated, providing the sensor designer with the chemical, physical, and electronic information extracted from each technique.

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“…Depending on the operational temperature, one or more of these adsorbed oxygen species will be in a dynamic equilibrium with the environment. The presence of

Section: Overview Of Adsorbed Oxygen From the Viewpoint Of Gas Sensor...mentioning

confidence: 99%

Section: Review Of Analytical-spectral-microscopic Tools For Semicond...mentioning

confidence: 99%

Adsorbed Oxygen Ions and Oxygen Vacancies: Their Concentration and Distribution in Metal Oxide Chemical Sensors and Influencing Role in Sensitivity and Sensing Mechanisms

Çiftyürek

Schierbaum

2022

Sensors

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show abstract

“…The calculated value of ν is therefore estimated as 2 Â 10 11 s À 1 , which is two orders of magnitude lower than the frequency factor (10 13 s À 1 ) provided by the classical Eyring's theory [37], but two orders of magnitude higher than values 2 Â 10 8 -3 Â 10 9 s À 1 , obtained for SnO 2 Á Á Á O 2 system in TPD experiments [38]. These differences illustrate some limitations of the TPD methods based on peak maximum temperatures and described elsewhere [38,39]. On the other hand, it is known that GGA-PBE calculations overestimate the vibrational frequencies by several percent [40].…”

Section: Finite Temperature Effectsmentioning

confidence: 56%

Thermal desorption of molecular oxygen from SnO 2 (110) surface: Insights from first-principles calculations

Golovanov

Golovanova

Rantala

2016

Journal of Physics and Chemistry of Solids

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“…Depending on the operational temperature, one or more of these adsorbed oxygen species will be in a dynamic equilibrium with the environment. The presence of O 2− in the dynamic adsorption-desorption process is observed up to 500°C [25,21,26,27]. Above 500°C, it is reported that there are multiple dynamic equilibriums under certain specific oxygen partial pressure.…”

mentioning

confidence: 94%

Adsorbed Oxygen Ions and Oxygen Vacancies; Their Concentration and Distribution in Metal Oxide Chemical Sensors and Influencing Role in Sensitivity and Sensing Mechanism

Çiftyürek¹,

Li²,

Schierbaum³

2022

Preprint

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Oxidation reactions on semiconducting metal oxides (SMOs) surfaces have been extensively worked on in catalysis, fuel cells, and sensors. SMOs engaged powerfully in energy-related applications such as batteries, supercapacitors, solid oxide fuel cells (SOFCs), and chemical gas sensors. The deep understanding of SMO surface and oxygen interactions and defect engineering has become significant because all those mentioned applications are based on the adsorption/absorption and consumption/transportation of adsorbed (physisorbed-chemisorbed) oxygen. More understanding of adsorbed oxygen and oxygen vacancies (〖V_O^•,V〗_O^(••)) is needed, as the former is the vital requirement for sensing chemical reactions, while the latter facilitates the replenishment of adsorbed oxygen ions on the surface. We determined the relation between sensor response (sensitivity) and the amounts of adsorbed oxygen ions (O_(2(ads))^-,O_((ads),)^- O_2(ads)^(2-),O_((ads))^(2-)), water/hydroxide groups (H2O/OH^-), oxygen vacancies (〖V_O^•,V〗_O^(••)), and ordinary lattice oxygen ions (O_lattice^(2-)) as a function of temperature. During hydrogen (H2) testing, the different oxidation states (W6+, W5+, and W4+) of WO3 were quantified and correlated with oxygen vacancy formation (〖V_O^•,V〗_O^(••)). We used a combined application of XPS, UPS, XPEEM-LEEM, and chemical, electrical and sensory analysis for H2 sensing. We established a correlation between the H2 sensing mechanism of WO3, sensor signal magnitude, the amount of adsorbed oxygen ions, and sensor testing temperature. This paper also provides a review of the detection, quantification, and identification of different adsorbed oxygen species. The different surface and bulk-sensitive characterization techniques relevant to analyzing the SMOs-based sensor are tabulated, providing the sensor designer with the chemical, physical, and electronic information extracted from each technique.

show abstract

TPD and ITPD study of materials used as chemoresistive gas sensors

Cited by 9 publications

References 25 publications

Adsorbed Oxygen Ions and Oxygen Vacancies: Their Concentration and Distribution in Metal Oxide Chemical Sensors and Influencing Role in Sensitivity and Sensing Mechanisms

Adsorbed Oxygen Ions and Oxygen Vacancies: Their Concentration and Distribution in Metal Oxide Chemical Sensors and Influencing Role in Sensitivity and Sensing Mechanisms

Thermal desorption of molecular oxygen from SnO 2 (110) surface: Insights from first-principles calculations

Adsorbed Oxygen Ions and Oxygen Vacancies; Their Concentration and Distribution in Metal Oxide Chemical Sensors and Influencing Role in Sensitivity and Sensing Mechanism

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