The oxidizing effect of humidity on WO3 based sensors

Staerz, Anna; Berthold, Christoph; Ruß, Tamara; Wicker, Susanne; Weimar, Udo; Bârsan, Nicolae

doi:10.1016/j.snb.2016.06.072

Cited by 102 publications

(79 citation statements)

References 23 publications

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“…From the measurements done at room temperature after the heating, it can be seen that the phase transition is reversible. It has been previously reported that this mixed phase is stable [10]. The XRD results are shown in Figure 2.…”

Section: Resultsmentioning

confidence: 61%

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WO3 Based Gas Sensors

et al. 2019

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WO3 is a commonly used material for gas sensing. Although a great deal of research has been done on how to tune sensors based on WO3, no clear consensus exists on what characteristics are inherent to the metal oxide: This work looks at six different WO3 samples and aims to identify which characteristics are common to all materials. Specifically, the interaction of the samples with humidity is examined.

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Section: Resultsmentioning

confidence: 61%

“…In the case of the SA sample and the RO sample, no significant formation of hydroxyl groups is visible. The following mechanism has been suggested [10]:…”

Section: Resultsmentioning

confidence: 99%

WO3 Based Gas Sensors

et al. 2019

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“…The combination of ZnO with silica in a core-shell structure provides a useful ethanol response with only a minor degradation due to moisture at 56% R.H. (Saboor et al 2017). In contrast to the zinc oxide behaviour, the moisture response of tungsten trioxide can be a resistance increase, an augmentation of the response to carbon monoxide and a reduction of the response to nitrogen dioxide (Staerz et al 2016). The key mechanism here involves oxygen vacancies in the WO 3 lattice.…”

Section: Emerging Applicationsmentioning

confidence: 99%

Progress in the development of semiconducting metal oxide gas sensors: a review

Moseley¹

2017

Meas. Sci. Technol.

248

118

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Since the first suggestion, during the 1950s, that high-surface-area metal oxides could be used as conductometric gas sensors enormous efforts have been made to enhance both the selectivity and the sensitivity of such devices, and to reduce their operational power requirements. This development has involved the exploration of response mechanisms, the selection of the most appropriate oxide compositions, the fabrication of two-phase 'hetero-structures', the addition of metallic catalyst particles and the optimisation of the manner in which the materials are presented to the gas-the structure and the nanostructure of the sensing elements. Far more of the scientific literature has been devoted to seeking such improvements in metal oxide gas sensors than has been directed at all other solid-state gas sensors together. Recent progress in the research and development of metal oxide gas sensor technology is surveyed in this invited review. The advances that have been made are quite spectacular and the results of individual pieces of work are drawn together here so that trends can be seen. Emerging features include: the significance of n-type/p-type switching, the enhancement of sensing performance of materials through the incorporation of secondary components and the advantages of interrogating sensors with alternating current rather than direct current.

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“…From am ore generalp erspective and based on the numerous experimental results published in literature one can conclude:1 )The average particle size and size distribution can be affected by the type and amount of the precursor,t he reduction method, and the conditions and properties of the substrate. [61c,e, 63, 65] 2) The SFRD process, especially,e nables the formation of uniform mono-and bimetallicn anoparticles. [63a, 65a] 3) Catalysts prepared via SFRD exhibit an activity highert han reference samples preparedb yc onventionalm ethods such as wet impregnation.…”

Section: Preparation Of Sophisticated Materials: Challenges and Recenmentioning

confidence: 99%

Exploiting Synergies in Catalysis and Gas Sensing using Noble Metal‐Loaded Oxide Composites

et al. 2018

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Noble metal/metal oxide nanocomposites are very important in various fields of catalysis and play an evenly important role in gas sensing. Although there are many similarities regarding the choice of materials, the synthesis and the fundamental mechanisms, both research fields have been mostly treated independently up to now. In both fields, open questions regarding the elementary steps in the interaction of the gases with the active species and the role of the noble metal, the semiconducting metal oxide support and the interface remain. In this concept article, we first outline the importance of such composites in catalysis and gas sensing focussing on Pt/Pd, as well as CeO2 and SnO2 as transition metal oxides. Next, the state of art of both fundamental and relevant surface reactions and electronic mechanisms are described. Finally, we highlight the synergy of jointly exploring catalysis and gas sensing of noble metal/metal oxide nanocomposite materials and the benefit for both research fields if they are dealt with simultaneously using advanced characterization and operando methods, sophisticated preparation techniques, testing of the performance, and predictive theoretical modelling.

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The oxidizing effect of humidity on WO3 based sensors

Cited by 102 publications

References 23 publications

WO3 Based Gas Sensors

WO3 Based Gas Sensors

Progress in the development of semiconducting metal oxide gas sensors: a review

Exploiting Synergies in Catalysis and Gas Sensing using Noble Metal‐Loaded Oxide Composites

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