Electrical and sensory properties of silicon–graphene nanosystems

Olenych, I. B.; Aksimentyeva, О. І.; Horbenko, Yulia; Ціж, Б.

doi:10.1007/s13204-021-01698-7

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…If we look at the parameters of the low-frequency part of the impedance spectrum CPE dl and R ct , we can see that the change in capacitance is within 55%, and the change in resistance is within 33%, respectively (Table 3). The largest change in the capacity of the CPE dl is observed with the addition of 3% silica nanoparticles, due to an increase in concentration of free charge carriers provided by added nanoparticles [28]. Also, as a result of the presence of silica nanoparticles, the resistance (R ct ) decreases due to the appearance of additional conductive contacts.…”

Section: Resultsmentioning

confidence: 99%

Modeling of Electrochemical Impedance of Fuel Cell Based on Novel Nanocomposite Membrane

Zhyhailo,

Yevchuk,

Ivashchyshyn

et al. 2024

Energies

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The new hybrid composite materials for PEM fuel cell were synthesized by the UV polymerization of acrylic monomers (acrylonitrile, acrylic acid, ethylene glycol dimethacrylate) and a sulfo aromatic monomer, i.e., sodium styrene sulfonate, and the tetraethoxysilane/3-methacryloxypropyltrimethoxysilane-based sol–gel system. By means of X-ray spectroscopy, the fractal structure of the obtained materials was characterized. Proton conductivity and viscoelasticity of the obtained materials were determined depending on the content of the inorganic component in nanocomposites. Based on impedance studies, an equivalent scheme is proposed that successfully describes the proton conductivity in the synthesized composite’s electrolyte membranes.

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Section: Resultsmentioning

confidence: 99%

Modeling of Electrochemical Impedance of Fuel Cell Based on Novel Nanocomposite Membrane

Zhyhailo,

Yevchuk,

Ivashchyshyn

et al. 2024

Energies

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“…Hybrid silicon nanocrystals (nc‐Si)−reduced graphene oxide (RGO) nanosystems are suggested as sensitive elements to the creation of an ammonia sensor by joint Ukrainian‐Poland team [13] . Such structures were obtained by the electrochemical etching of the porous silicon and mixing separated nanostructures from silicon substrate with graphene nanosheets.…”

Section: State Of the Artmentioning

confidence: 99%

“…Hybrid silicon nanocrystals (nc-Si)À reduced graphene oxide (RGO) nanosystems are suggested as sensitive elements to the creation of an ammonia sensor by joint Ukrainian-Poland team. [13] Such structures were obtained by the electrochemical etching of the porous silicon and mixing separated nanostructures from silicon substrate with graphene nanosheets. The transport of charge carriers in the nc-SiÀ RGO nanosystem showed that an increase in the RGO content leads to decreasing the electrical resistance and increasing the capacity of the obtained nanomaterial.…”

Section: State Of the Artmentioning

confidence: 99%

Chemistry of nanomaterials in Ukraine: per aspera

Nykyruy,

Andriichuk,

Tynkevych

et al. 2023

ChemistrySelect

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This review covers major aspects of nanochemistry in Ukraine. It describes current state of the field, lists main contributors and discuss the trends and limitations of its development. Ukraine's nanotechnology can be traced back to the country's rich scientific heritage, which includes a long tradition of excellence in materials science, chemistry, and physics. Despite limited and sporadic financial support, nanochemistry has occupied decent plase in the country scientific agenda. Related courses in the education institution contributed to the formation of the generation of skilled chemists who build their successful career internationally.

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“…У режимі змінного струму провідність кремнієвих і карбонових наноструктур та ефективність електричного контакту між ними визначають резистивну складову імпедансу, а перенесення заряду через границі між наночастинками формує механізм ємнісної складової повного опору чутливих елементів на основі por-Si-rGO. Зазначені особливості перенесення заряду у таких наносистемах зумовлюють різну дисперсію електричних характеристик у різних частотних діапазонах [28].…”

Section: рис 2 сем-зображення поверхні сенсорної плівки Por-si-rgounclassified

“…Більш того, змінюючи пропорцію компонентів наносистеми por-Si: rGO можна налаштувати максимальну чутливість, а значить і селективність, сенсорного елемента до певного типу газів. Зокрема у діапазоні низьких концентрацій (до 2,5%) такий підхід забезпечує різну чутливість сенсора до молекул етанолу та аміаку [28].…”

Section: рис 2 сем-зображення поверхні сенсорної плівки Por-si-rgounclassified

Porous Silicon Nanosystems for Ethanol Sensor

Olenych¹,

Monastyrskii²

2022

SEMST

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Sensory elements based on hybrid films containing porous silicon and reduced graphene oxide nanostructures have been created. A decrease in electrical resistance and an increase in the capacitance of sensor elements in the AC mode due to the adsorption of ethanol molecules have been registered. To assess the sensory properties of hybrid films, the concentration dependences of the adsorption ability in the 0–4.5% range were determined and the dynamic characteristics of ethanol sensors based on them were studied. It was found that sensor films with different ratios of porous silicon and reduced graphene oxide nanoparticles have the maximum sensitivity to ethanol in different concentration ranges. The functional properties of hybrid films can be controlled by changing the proportions of their components. The reaction time of sensory elements to changes in the concentration of ethanol molecules is 40–50 s. The obtained results expand the perspective of the application of nanosystems based on porous silicon in sensor devices.

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Electrical and sensory properties of silicon–graphene nanosystems

Cited by 11 publications

References 29 publications

Modeling of Electrochemical Impedance of Fuel Cell Based on Novel Nanocomposite Membrane

Modeling of Electrochemical Impedance of Fuel Cell Based on Novel Nanocomposite Membrane

Chemistry of nanomaterials in Ukraine: per aspera

Porous Silicon Nanosystems for Ethanol Sensor

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