scholarly journals Pyroelectric Properties of BaxSr(1−x)TiO3/PVDF-TrFE Coating on Silicon

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 577
Author(s):  
Mariya Aleksandrova ◽  
Arya Sohan ◽  
Pratap Kollu ◽  
Georgi Dobrikov
Keyword(s):  
Dynamic Method ◽  
Electrode Materials ◽  
Electrical Potential ◽  
Voltage Response ◽  
Pyroelectric Properties ◽  
Barium Strontium ◽  
Interdigital Electrodes ◽  
Plane Direction ◽  
The One ◽  
Pyroelectric Response

Bilayer coatings of barium strontium titanate (BaxSr(1−x)TiO3)/poly [(vinylidenefluoride-co-trifluoroethylene] (PVDF-TrFE) were integrated on silicon Si (100) for pyroelectric devices. Pyroelectric properties of the composite were determined for different electrode materials (silver and aluminum) and different electrodes configurations creating an electric field in parallel and in-plane direction in the ferroelectric coating. For this purpose, parallel-plate and planar interdigital capacitors were fabricated. Anisotropy in the pyroelectric response was noted for the different directions of the measured electrical potential. The dynamic method was used to evaluate the pyroelectric properties in the temperature range of 22 to 48 °C. Pyroelectric response with a higher value was observed at the one plate’s configuration of interdigital electrodes. The voltage response was the strongest when silver contacts were used. At temperatures near room temperature, the voltage increased by 182 µV at resolution of 7 µV/°C for the in-plain device configuration, vs. 290 µV at a resolution of 11 µV/°C for the out-of-plain configuration. A relationship between the surface morphology of the ferroelectric oxide and oxide/polymer coating and the pyroelectric voltage was also found, proving the smoothening effect of the introduction of polymer PVDF-TrFE over the BaSrTiO3 grains.

Method of first integrals and interface, surface waves

2010 ◽  
Vol 32 (2) ◽  
pp. 107-120
Author(s):  
Pham Chi Vinh ◽  
Trinh Thi Thanh Hue ◽  
Dinh Van Quang ◽  
Nguyen Thi Khanh Linh ◽  
Nguyen Thi Nam
Keyword(s):  
Rayleigh Waves ◽  
Displacement Vector ◽  
Attenuation Factor ◽  
Electrical Potential ◽  
Polarization Vector ◽  
First Integrals ◽  
Dispersion Equations ◽  
Interface Surface ◽  
Electric Induction ◽  
The One

The method of first integrals (MFI) based on the equation of motion for the displacement vector, or  based on the one for the traction vector was introduced  recently in order to find explicit secular equations of Rayleigh waves whose characteristic equations (i.e the equations determining the attenuation factor) are fully quartic or are of higher order (then the classical approach is not applicable). In this paper it is shown that, not only to Rayleigh waves,  the MFI can be applicable also to other waves by running it on the equations for mixed vectors. In particular: (i) By applying the MFI  to the equations for the displacement-traction vector we get the explicit dispersion equations of Stoneley waves in twinned crystals (ii)  Running the MFI on the equations for the traction-electric induction vector and the traction-electrical potential vector provides the explicit dispersion equations of SH-waves in piezoelastic materials. The obtained dispersion equations are identical with the ones previously derived using the method of polarization vector, but the procedure of driving them is more simple.

A dynamic method for the measurement of pyroelectric properties of materials

2018 ◽  
Vol 27 (8) ◽  
pp. 084004 ◽  
Author(s):  
R Ghane-Motlagh ◽  
M Kroener ◽  
F Goldschmidtboeing ◽  
A N Danilewsky ◽  
P Woias
Keyword(s):  
Dynamic Method ◽  
Pyroelectric Properties ◽  
Properties Of Materials

scholarly journals Nanostructured materials for sensing Pb(II) and Cd(II) ions: Manganese oxohydroxide versus carbonized polyanilines?

2013 ◽  
Vol 78 (11) ◽  
pp. 1717-1727 ◽  
Author(s):  
Biljana Sljukic ◽  
Darko Micic ◽  
Nikola Cvjeticanin ◽  
Gordana Ciric-Marjanovic
Keyword(s):  
Nanostructured Materials ◽  
Electrode Materials ◽  
Anodic Stripping Voltammetry ◽  
Aqueous Media ◽  
Stripping Voltammetry ◽  
Lead And Cadmium ◽  
Manganese Oxyhydroxide ◽  
The One ◽  
Lower Limits

Nanostructured materials including three different carbonized polyanilines and manganese oxyhydroxide were prepared and evaluated as electrode materials for sensing of lead and cadmium ions in aqueous media. Anodic stripping voltammetry results indicated that all prepared materials could be successfully used for determination of these two heavy metal ions. Carbonized polyaniline-based electrodes have higher signal and lower limits of detection (10-7 ?) compared to manganese oxyhydroxide-based electrode. Among the three studied carbonized polyanilines, the one that was derived from polyaniline precursor produced in the presence of 3,5-dinitrosalicyclic acid showed the highest electrocatalytic activity towards the lead and cadmium oxidation.

Passive Energy Harvesting From Human Activities

2009 ◽  
Author(s):  
Edwar Romero ◽  
Michael R. Neuman ◽  
Robert O. Warrington
Keyword(s):  
Energy Harvesting ◽  
Human Activities ◽  
Energy Harvester ◽  
Electrical Power ◽  
Electrical Potential ◽  
Human Motion ◽  
Planar Coil ◽  
Solar Powered ◽  
The One ◽  
Electrical Power Output

Energy harvesting from environmental sources such as motion, light, and temperature changes, has been demonstrated with commercially viable products (such as human-powered flashlights, solar-powered calculators, and thermal-powered wristwatches). Vibration or motion is an attractive environmental energy source due to its abundance and availability. A new electromagnetic energy harvester presented here is found to be capable for scavenging energy from human motion. The electrical power output of an inertial energy scavenger is proportional to the acceleration-squared-to-frequency (ASTF) and the quality (Q) factor. Human motion is associated with large ASTF values and low Q factors while machine vibrations are usually related with the opposite. Thus, passive energy harvesting from human activities could generate as much power as the one available from machine harvesters. The limit for such inertial generator is estimated to be on the order of 1mW/cm3. This paper reviews the energy harvesting limits, the energy generation from human activities, and the development of a new oscillating electromagnetic generator. This energy harvester is built with a permanent magnet (PM) ring with multiple poles and a gear-shaped planar coil. The PM ring has attached an eccentric proof mass for converting external movement into oscillations or rotations, these oscillations induce an electrical potential on the planar coil. As much as 3.45μW of power have been generated with a prototype at a frequency of 2.7Hz on a laboratory shaker and 2.35μW had been obtained when positioned laterally on the hip while walking.

Study of the pyroelectric properties of PLZT ceramics by dynamic method

1987 ◽  
Vol 74 (1) ◽  
pp. 81-85 ◽  
Author(s):  
A. A. Bogomolov ◽  
T. A. Dabizha
Keyword(s):  
Dynamic Method ◽  
Pyroelectric Properties
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