Search results

1

Bilayer Structures of NiO_{x} and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems

100%

Jakubik W., Urbańczyk M., Maciak E., Pustelny T.

Acta Physica Polonica A

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2009

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vol. 116

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issue 3

315-320

EN

A bilayer sensor structure of nickel oxide NiO_x ( ≈ 60 nm) with a very thin film of palladium (Pd ≈ 18 nm) on the top, has been studied for gas-sensing application at relatively low temperatures of about 30°C and 60°C. The bilayer structure was obtained by rf sputtering and by vacuum deposition (first the NiO_{x} and then the Pd film) onto a LiNbO_{3} Y-cut Z-propagating substrate, making use of the surface acoustic wave method, and additionally (in the same technological processes) onto a glass substrate with a planar microelectrode array for simultaneous monitoring of the planar resistance of the layered structure. Such a bilayer structure was investigated in a low concentration range (from 50 ppm to 400 ppm in air) of nitrogen dioxide (NO_{2}), carbon monoxide (CO) and ammonia (NH_{3}) in a dry and wet air atmosphere and in a medium hydrogen concentration (1-2.5%) in dry air. The NiO_{x} and Pd bilayer structure interact rather weakly with NO_{2} molecules but with CO and NH_{3} this interaction is much greater, especially at higher temperature ( ≈ 60°C). The hydrogen sensitivity is on the medium level, not exceeding 600 Hz (relative change in the differential frequency of ≈ 2.3%) at interaction temperature of 35°C.

2

State of the Work Diagram of the Artificial Heart

100%

Konieczny G., Opilski Z., Pustelny T., Maciak E.

Acta Physica Polonica A

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2009

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vol. 116

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issue 3

344-347

EN

This paper presents the results of investigations on novel pressure measurement methods to be for used in the project "Polish Artificial Heart". The investigations concerned possible pressure sensors for noninvasive blood pressure measurements in selected points around the pneumatic ventricular assist device (POLVAD). The fiber pressure sensor and the possibility of pressure measurements with piezofoils were tested. The paper includes preliminary results and development plans.

3

Studies of changes in electrical resistance of zinc oxide nanostructures under the influence of variable gaseous environments

100%

Procek M., Pustelny T., Stolarczyk A., Maciak E.

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2014

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issue 4

4

SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results

100%

Hejczyk T., Urbańczyk M., Wituła R., Maciak E.

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2012

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issue 3

5

Surface acoustic wave hydrogen gas sensor based on layered structure of palladium/metal-free phthalocyanine

100%

Jakubik W. P., Urbańczyk M., Maciak E., Pustelny T.

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2008

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vol. 56

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issue 2

6

Layered thin film nanostructures of Pd/WO3-x as resistance gas sensors

88%

Pustelny T., Urbańczyk M., Maciak E., Gut K., Jakubik W.

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2011

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issue 4

7

Investigations of optical interferometric structures applied in toxic gas sensors

76%

Opilski Z., Pustelny T., Maciak E., Bednorz M., Stolarczyk A., Jadamiec M.

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2005

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vol. 53

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issue 2

8

Investigations of SAW Structures with Oxide Graphene Layer to Detection of Selected Gases

64%

Drewniak S., Pustelny T., Setkiewicz M., Maciak E., Urbańczyk M., Procek M., Opilski Z., Jagiello J., Lipinska L.

Acta Physica Polonica A

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2013

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vol. 124

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issue 3

402-405

EN

In this paper we present the results of investigations of graphene oxide layers using the SAW structure (structure with surface acoustic wave propagated) exposed to the affect of low concentrations of hydrogen and nitrogen dioxide in synthetic air. During the measurements, the differential signal (from two measuring channels) was recorded. The sensing graphene oxide layer was deposited only on first channel, whereas the second channel was not covered by any additional layer. The tests were made with various concentrations of the analyzed gases and at various temperatures of the sensing structure during the measurements. Analyses were performed with special emphasis on the time response of the sensor structure to changes in the gas atmosphere.

9

The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres

64%

Urbańczyk M., Opilski Z., Pustelny T., Drewniak S., Setkiewicz M., Maciak E., Procek M., Gut K., Jagiello J., Lipińska L.

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2013

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issue 3

10

Gas sensors based on nanostructures of semiconductors ZnO and TiO2

64%

Pustelny T., Urbańczyk M., Opilski Z., Stolarczyk A., Procek M., Maciak E., Drewniak S., Setkiewicz M., Gut K.

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2012

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issue 4

11

The Influence of Humidity on the Resistance Structures with Graphene Sensor Layer

52%

Pustelny T., Setkiewicz M., Drewniak S., Maciak E., Stolarczyk A., Procek M., Urbańczyk M., Gut K., Opilski Z., Pasternak I., Strupinski W.

Acta Physica Polonica A

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2012

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vol. 122

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issue 5

870-873

EN

In the paper the results of investigations are presented concerning the influence of humidity of air on the resistance of a gas sensor structure with a graphene layer. The affects of nitrogen dioxide and humidity action on graphene were studied. We indicated that humidity might play an important role in determining the gas sensing properties of the graphene layer. In the paper it has been shown that in the case of a nitrogen oxide sensor, the reaction of NO_2 with water vapour can generate permanent defects in graphene.

12

The sensibility of resistance sensor structures with graphene to the action of selected gaseous media

52%

Opilski Z., Stolarczyk A., Pustelny T., Urbańczyk M., Setkiewicz M., Drewniak S., Maciak E., Procek M., Gut K., Pasternak I., Strupinski W.

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2013

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issue 2

Refine search results

Bilayer Structures of NiO_{x} and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems

State of the Work Diagram of the Artificial Heart

Studies of changes in electrical resistance of zinc oxide nanostructures under the influence of variable gaseous environments

SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results

Surface acoustic wave hydrogen gas sensor based on layered structure of palladium/metal-free phthalocyanine

Layered thin film nanostructures of Pd/WO3-x as resistance gas sensors

Investigations of optical interferometric structures applied in toxic gas sensors

Investigations of SAW Structures with Oxide Graphene Layer to Detection of Selected Gases

The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres

Gas sensors based on nanostructures of semiconductors ZnO and TiO2

The Influence of Humidity on the Resistance Structures with Graphene Sensor Layer

The sensibility of resistance sensor structures with graphene to the action of selected gaseous media