Nanocrystalline tin dioxide: Basics in relation with gas sensing phenomena. Part I. Physical and chemical properties and sensor signal formation

Marikutsa, Artem; Rumyantseva, M. N.; Gaskov, Alexander; Samoylov, A. M.

doi:10.1134/s002016851513004x

Cited by 33 publications

(14 citation statements)

References 78 publications

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“…Chemisorbed oxygen species are negatively charged due to localization at chemisorbed oxygen of electrons from the semiconductor conduction band, and such process formed negatively charged surface potential. Thus, the near-surface layer of the semiconductor becomes depleted by electrons due to the presence of such a potential [ 21 ]. In the process of high-temperature formation of the sensor nanomaterial, many intergrain contacts are formed.…”

Section: Resultsmentioning

confidence: 99%

“…When the sensor is placed in air at very high temperatures, the desorption of the chemisorbed oxygen occurs [ 18 , 19 , 24 ], and thus, the quantity of the chemisorbed charged oxygen species decreases. This process leads to a decrease in the height of the potential barrier and an increase in the concentration of the main charge carriers in the near-surface layer of the semiconductor [ 21 , 23 ]. The desorption of oxygen leads to a decrease in the sensor resistance.…”

Section: Resultsmentioning

confidence: 99%

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Semiconductor Gas Sensors Based on Pd/SnO2 Nanomaterials for Methane Detection in Air

et al. 2017

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Semiconductor sensors based on nanosized Pd-containing tin dioxide have been obtained by a sol–gel technique. Semiconductor gas-sensitive materials were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD) methods. Influence of Pd additives on sensitivity of the sensors to methane has been studied. Temperature dependences of electrical resistance in air and sensor response to methane on palladium content for the sensors based on nanosized materials Pd/SnO2 have been investigated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Semiconductor Gas Sensors Based on Pd/SnO2 Nanomaterials for Methane Detection in Air

et al. 2017

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“…Secondly, due to the extremely high catalytic activity, palladium and palladium (II) oxide were applied as additives to improve gas-sensing performance of tin dioxide SnO 2 to a wide range of gases [41][42][43]. Thirdly, the opinion that long recovery process and high stability could be referred to the main disadvantages of the oxidizing gas sensors based on tin dioxide has been expressed earlier [44,45]. Fourthly, the metal oxide semiconductors with p-type conductivity are more perspective for oxidizing gas detection than the materials with n-type conductivity.…”

Section: Novel Nanomaterials -Synthesis and Applicationsmentioning

confidence: 99%

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Samoylov¹,

Ryabtsev²,

Popov³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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One of the most important environment monitoring problems is the detection of oxidizing gases in the ambient air. Negative impact of noxious oxidizing gases (ozone and nitrogen oxides) on human health, sensitive vegetation, and ecosystems is very serious. For this reason, palladium (II) oxide nanostructures have been employed for oxidizing gas detection. Thin and ultrathin films of palladium (II) oxide were prepared by thermal oxidation at dry oxygen of previously formed pure palladium layers on polished poly-Al 2 O 3 , SiO 2 /Si (100), optical quality quartz, and amorphous carbon/KCl substrates. At ozone and nitrogen dioxide detection, PdO films prepared by oxidation at T = 870 K have demonstrated good values of sensitivity, signal stability, operation speed, and reproducibility of sensor response. In comparison with other materials, palladium (II) oxide thin and ultrathin films have some advantages at gas sensor fabrication. Firstly, for oxidizing gas detection, PdO films with p-type conductivity are more perspective than the material with n-type conductivity. Secondly, at ambient conditions, palladium (II) oxide is insoluble in water and does not react with it. These facts are favorable for the fabrication of gas detectors because they make possible to minimize the air humidity influence on PdO sensor response values. Thirdly, the synthesis procedure of PdO films is rather simple and is compatible with planar processes of microelectronic industry.

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“…Metal oxides represent a very promising material for such kind of applications; they possess a broad range of electronic, chemical, and physical properties that allow them to be widely used and investigated in the detection of volatiles and other gases [7][8][9]. In this context, one of the most interesting metal oxide is tin oxide (SnO 2 ), an ntype semiconductor with a direct wide band gap 3.62 eV at 300 K [10][11][12], and a variety of potential applications such as transparent conducting electrodes, solar cells and most importantly in gas sensing technology [13][14][15][16][17]. The detection mechanism of these sensors relies on the change of the metal oxide resistance induced by absorption or desorption of gas molecules [18,22].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic evaluation of gas testing chamber: Simulation, experiment

Annanouch

Bouchet

Perrier

et al. 2019

Sensors and Actuators B: Chemical

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Gas concentration measurements by means of metal oxide microsensors represent a promising issue due to several advantages (size, low cost, power consumption, reliability…).However, improvements are required to increase performances of complete experimental systems including microsensor and testing chamber at least. This paper deals with the study of different size and shape configurations of gas testing chamber, by coupling 3D unsteady modelling and experiments in the case of a SnO 2 sensor with ethanol gas flow. The influence of the testing-chamber design on the gas flow hydrodynamics and on the system response is shown. A new 3D-printed prototype chamber (boat-shape design), as compared to the commonly used testing chamber (cross-shape design), leads to an increase of the dynamics, an enhancement of the gas concentration homogeneity and a significant reduction of flow recirculation and dead volumes. In this work we have shown that the optimization of the test chamber (volume and shape) makes it possible to get as close as possible to the real electrical characteristics of the sensor. Consequently thanks to these new achieved characteristics, the performances of the whole system are improved.

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Nanocrystalline tin dioxide: Basics in relation with gas sensing phenomena. Part I. Physical and chemical properties and sensor signal formation

Cited by 33 publications

References 78 publications

Semiconductor Gas Sensors Based on Pd/SnO2 Nanomaterials for Methane Detection in Air

Semiconductor Gas Sensors Based on Pd/SnO2 Nanomaterials for Methane Detection in Air

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Hydrodynamic evaluation of gas testing chamber: Simulation, experiment

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