Photocatalytic properties of zinc oxide-porous silicon nanocomposite photocatalyst

Toporovska, L. R.; Turko, B.; Serkiz, R.; Kapustianyk, V.; Rudko, М.

doi:10.30970/jps.22.1601

Cited by 6 publications

(5 citation statements)

References 6 publications

(8 reference statements)

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“…After reaching a critical thickness of approximately 89 nm for ZnO, the photocatalytic properties of the material mostly reach a plateau [11]. Therefore, the number of generated electronhole pairs and, accordingly, the catalytic activity of the photocatalyst depend on the surface area of ZnO illuminated by a light source [2]. And our experimental sample had a developed surface.…”

Section: Resultsmentioning

confidence: 99%

“…Compared to the TiO 2 semiconductor, zinc oxide has a higher exciton binding energy, is more resistant to radiation, and is a multifunctional material with piezoelectric and the case of impurities also ferroelectric and ferromagnetic properties. In addition, it is important to note that controlled doping can reduce the eective band gap in ZnO, which will make it possible to use visible light for photocatalytic oxidation [1,2,57].…”

Section: Introductionmentioning

confidence: 99%

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Porous zinc oxide plate with micro- and nanoelements of the surface structure for heterogeneous photocatalysis

Hrytsak¹,

Turko²,

Vasilyev³

et al. 2022

J. Phys. Stud.

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The zinc oxide porous plate with micro-and nanoelements of the surface structure was obtained by sintering metallic zinc powder, characterized and tested for the photodegradation of model organic dye (methyl orange) in water. The kinetics of dye photodegradation was studied via measurement of variation of the optical density at the maximum observed for the dye at 465 nm. After 30 min of illumination, the photodegradation eciency of methyl orange was found to be about 100 % when the ZnO plate with overall dimensions of 35 mm × 7 mm × 1 mm was used. The reaction rate constant calculated using the rst-order approximation was equal to 2.7 • 10 −4 sec −1 . It is necessary to point out that the sample keeps its integrity after multiple experiments, which is important for practical applications. The obtained results evidently demonstrate the potential of the method of sintering metallic zinc powder for the production of ecient catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porous zinc oxide plate with micro- and nanoelements of the surface structure for heterogeneous photocatalysis

Hrytsak¹,

Turko²,

Vasilyev³

et al. 2022

J. Phys. Stud.

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“…UV light with the photon energy, not lower than the band gap of ZnO, stimulates carrier generation and consequently increases the density of free electronhole pairs in the ZnO lms through the following reaction [15,19,40,41]:…”

Section: Fig 2 3d Afm Image Of Zno Thin Lmmentioning

confidence: 99%

The effect of UV light irradiation on the gas-sensing properties of the quartz crystal microbalance sensor combined with ZnO film

Turko,

Vasil'yev,

Kapustianyk

et al. 2023

J. Phys. Stud.

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Zinc oxide thin lms were deposited on the both electrodes of the commercial quartz resonator HC49U using the standard radio-frequency magnetron sputtering method in order to provide NH3, H2O2 and C2H5OH vapor sensors application at room temperature. For the rst time, the impact of the ultraviolet light-emitting diode illumination (λmax = 395 nm, light irradiance of about 2 mW/cm 2 ) on the main characteristics of the ZnO coated quartz crystal microbalance sensor, such as response/recovery time and sensitivity, was studied. The obtained experimental data and calculated characteristics prove that ultraviolet illumination of the quartz crystal microbalance sensor covered with a ZnO lm leads to a signicant reduction in the recovery time at detection of ethanol, ammonia or hydrogen peroxide vapors. Under the inuence of ultraviolet irradiation, the fabricated quartz crystal microbalance sensor coated with ZnO lm showed promising potential in detecting explosive components.

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“…The study of PS properties is an actual task as a result of the applying of this material for the creating of emitting and detecting electronics structures. One of the methods is the modification of the PS surface [3]. Nanostructured material ZnO with p-type conductivity on the PS surface PS-pSi by electrochemical method was obtained, without preliminary processing of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Microprocessor System for Investigation of Sensor Characteristics on the Basis of Porous Silicon

Rabyk¹,

Turko²

2021

ELIT

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Development of integrated sensors is a promising scientific and technical direction to create components for measurement and information systems. Among the different types of analyser one of the places are occupied by sensors of hydrogen containing compounds in gaseous and liquid condition (especially poisonous and carcinogenic). Fixing the presence of a substances in the gas or liquid environment is an actual task for scientific, industrial and medical application areas.The main goal of this paper an inexpensive microprocessor system for measuring and analyzing electrical properties of nanocomposite sensing material such as porous silicon on the base of current and capacity-voltage characteristics and its hardware and software applying is represented.The microprocessor system is designed for measuring sensors current-voltage and capacityvoltage characteristics based on porous silicon and nanocomposite structures and consists of the following units: power supply unit, DC voltage regulator, control and measurement module, RLC-meter E7-22, UART/USB and RS232/USB converters, measuring cell, PC. The software of the microprocessor system for measuring consists of the software for the control and measurement module implemented on the Atmega 128 microcontroller and the main device management software for the PC. The main program algorithm and software are implemented in the C# programming language in the Visual Studio 2017 environmentThe results of the comparison allow us to conclude that the implemented modules of the microprocessor system for sensors I-V-and C-V characteristics testing can be used in the development of portable environmental monitoring devices, to study porous silicon sensors using them.

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Photocatalytic properties of zinc oxide-porous silicon nanocomposite photocatalyst

Cited by 6 publications

References 6 publications

Porous zinc oxide plate with micro- and nanoelements of the surface structure for heterogeneous photocatalysis

Porous zinc oxide plate with micro- and nanoelements of the surface structure for heterogeneous photocatalysis

The effect of UV light irradiation on the gas-sensing properties of the quartz crystal microbalance sensor combined with ZnO film

Microprocessor System for Investigation of Sensor Characteristics on the Basis of Porous Silicon

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