Oxidation of Hydrocarbons on the Surface of Tin Dioxide Chemical Sensors

Teterycz, Helena; Halek, P.; Wiśniewski, Kazimierz; Halek, G.; Koźlecki, Tomasz; Polowczyk, Izabela

doi:10.3390/s110404425

Cited by 17 publications

(13 citation statements)

References 18 publications

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“…The determined values of the

coefficient are the same (within the margin of error) and are independent of the chemical structure of the detected volatile organic compounds. Since the

coefficient is independent of the composition of the detected atmosphere, it should mean that the chemical reactions with volatile organic compounds taking place on the surface of Ga 2 O 3 proceed in multiple steps, but according to the same scheme [ 2 ].…”

Section: Resultsmentioning

confidence: 99%

“…where -resistivity of the grain boundaries, -resistivity of the grains, -oxygen partial pressure, -height of the energy gap between the grains. Both of the factors in the Equation (19) depend on the oxygen partial pressure in the ambient and the temperature [2,49,50]. Whereas changes of the conductance result from physicochemical processes occurring at the surface of a gas-sensitive material and in its bulk (i.e., at the grains boundaries, at the grain contacts, in the near-electrode areas).…”

Section: Analysis Of Gas Sensing Properties Of β-Ga2o3 Nanowiresmentioning

confidence: 99%

“…Among a wide variety of chemical gas sensors, the most commonly used are thick and thin film chemiresistors [ 1 ]. Parameters of chemiresistive gas sensors are determined by properties of gas receptor and transducer parts, sensor construction, and the type of detected gas [ 2 , 3 ]. The gas sensing layer of this type of sensors is typically made of semiconducting metal oxides SMOX (ZnO, SnO 2 , Ga 2 O 3 , WO 3 , Fe 2 O 3 , In 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

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Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

et al. 2021

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Gas sensitive structures made of nanowires exhibit extremally large specific surface area, and a great number of chemically active centres that can react with the ambient atmosphere. This makes the use of nanomaterials promising for super sensitive gas sensor applications. Monoclinic β-Ga2O3 nanowires (NWs) were synthesized from metallic gallium at atmospheric pressure in the presence of nitrogen and water vapor. The nanowires were grown directly on interdigitated gold electrodes screen printed on Al2O3 substrates, which constituted the gas sensor structure. The observations made with transmission electron microscope (TEM) have shown that the nanowires are monocrystalline and their diameters vary from 80 to 300 nm with the average value of approximately 170 nm. Au droplets were found to be anchored at the tips of the nanowires which may indicate that the nanowires followed the Vapor–Liquid–Solid (VLS) mechanism of growth. The conductivity of β-Ga2O3 NWs increases in the presence of volatile organic compounds (VOC) even in the temperature below 600 °C. The gas sensor based on the synthesized β-Ga2O3 NWs shows peak sensitivity to 100 ppm of ethanol of 75.1 at 760 °C, while peak sensitivity to 100 ppm of acetone is 27.5 at 690 °C.

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“…The determined values of the

coefficient are the same (within the margin of error) and are independent of the chemical structure of the detected volatile organic compounds. Since the

Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Gas Sensing Properties Of β-Ga2o3 Nanowiresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

et al. 2021

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“…Tin dioxide SnO 2 is a versatile material, which is in demand in many industries, namely: the production of gas sensors, catalysis and photocatalysis, and others (Miller et al 2006;Adnan et al 2010;Teterycz et al 2011). At the same time, it is promising as an ion exchanger (Petro et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanochemical and microwave modification on ion-exchange properties of tin dioxide with respect to uranyl ions

Samsonenko¹,

Zakutevskyy²,

Khalameida³

et al. 2019

Adsorption

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Wet gel and dried xerogel of precipitated tin oxy-hydroxide were subjected to mechanochemical and microwave treatments (MChT and MWT, respectively). The prepared samples were studied using DTA-TG, XRD, FTIR, nitrogen adsorption-desorption. MChT and MWT cause improvement of crystal structure, removal of structural OH-groups and increase mesopores diameter as well as form the meso-macroporous structure. As a result, drastic increase of uranyl-ions sorption for all modified samples is observed. Sorption centers can be divided into three groups: selective cation-exchange, non-selective cationexchange and anion-exchange. Keywords SnO 2 • Mechanochemical and microwave treatments • Ion-exchange properties * Barbara Charmas

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“…It is well known that the conductivity σ of a porous polycrystalline semiconducting oxide depends on the conductivity of the grain boundary σ gb and the conductivity of the bulk of the grains σ b [47][48][49]:…”

Section: Discussionmentioning

confidence: 99%

P-type Inversion at the Surface of β-Ga2O3 Epitaxial Layer Modified with Au Nanoparticles

Krawczyk

Korbutowicz

Szukiewicz

et al. 2022

Sensors

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The electric properties and chemical and thermal stability of gallium oxide β-Ga2O3 make it a promising material for a wide variety of electronic devices, including chemiresistive gas sensors. However, p-type doping of β-Ga2O3 still remains a challenge. A β-Ga2O3 epitaxial layer with a highly developed surface was synthesized on gold electrodes on a Al2O3 substrate via a Halide Vapor Phase Epitaxy (HVPE) method. The epitaxial layer was impregnated with an aqueous colloidal solution of gold nanoparticles with an average diameter of Au nanoparticle less than 5 nm. Electrical impedance of the layer was measured before and after modification with the Au nanoparticles in an ambient atmosphere, in dry nitrogen, and in air containing dimethyl sulfide C2H6S (DMS). After the impregnation of the β-Ga2O3 epitaxial layer with Au nanoparticles, its conductance increased, and its electric response to air containing DMS had been inversed. The introduction of Au nanoparticles at the surface of the metal oxide was responsible for the formation of an internal depleted region and p-type conductivity at the surface.

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Oxidation of Hydrocarbons on the Surface of Tin Dioxide Chemical Sensors

Cited by 17 publications

References 18 publications

Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds

Influence of mechanochemical and microwave modification on ion-exchange properties of tin dioxide with respect to uranyl ions

P-type Inversion at the Surface of β-Ga2O3 Epitaxial Layer Modified with Au Nanoparticles

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