Test Station for Frequency-Domain Dielectric Spectroscopy of Nanocomposites and Semiconductors

Kołtunowicz, Tomasz N.

doi:10.1007/s10812-015-0158-0

Cited by 40 publications

(10 citation statements)

References 18 publications

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“…Measurements of electrical parameters (capacitance C p , conductivity σ, the phase difference θ) have been performed in an equivalent parallel system using alternating current of the frequency range 50 Hz -5×10 6 Hz. The measuring temperature effect on electrical parameters of the nano films has been tested for the temperature range from 15 K to 375 K. The experimental setup that has been applied to measure AC electrical properties of nanocomposites is presented in [45,46]. The measurements have been realized for samples sized: 10 mm in length, 3 mm in width and 1 µm in thickness.…”

Section: Methodsmentioning

confidence: 99%

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

Boiko

Kołtunowicz

Żukowski

et al. 2017

Ceramics International

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Two samples of the ferromagnetic alloyferroelectric ceramics nanocomposite (FeCoZr) x (PbZrTiO 3 ) (100−x) of similar metallic phase contents have been produced using ion-beam sputtering in the atmosphere of argon and oxygen. The samples have been produced in order to examine the influence of sputtering atmosphere parameters on electrical properties of the tested materials.In a nanocomposite of a reduced oxygen content, a conductivity increase by about three orders occurs along with the increasing frequency, which is associated with the occurrence of hopping recharging. Over the whole area of low measuring frequencies, negative values of the phase shift and a capacitive type of conductivity occur. For the frequency of about 10 6 Hz, the phase shift reaches zero, which corresponds to the voltage resonance phenomenon. For higher frequencies, positive phase shift values and inductive conductivity occur. For a sample of a higher oxygen content, phenomena of voltage resonance (low frequency values) and current resonance (high frequency values) can be observed. When the oxygen content increases, frequency dependences of the phase difference get shifted into the low frequency area. This is associated with the surface oxidation or a complete oxidation of the metallic-phase nanograins, which increases the potential barrier as well as with an increase of the relaxation time activation energy. For the sample of a higher oxygen content, an increase of the conductivity activation energy has been observed in the low temperature area.

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Section: Methodsmentioning

confidence: 99%

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

Boiko

Kołtunowicz

Żukowski

et al. 2017

Ceramics International

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“…Alternating current (AC) measurements were performed on a stand developed and made at the Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, as described earlier . The stand included the CS 204AE-FMX-1AL (Advanced Research Systems, Inc., USA) helium cryostat, which enables measurements in the temperature range from 20 to 450 K with an accuracy of 0.002 K. The measurement was performed in vacuum (∼2 × 10 4 Pa).…”

Section: Methodsmentioning

confidence: 99%

Polycaprolactone–MXene Nanofibrous Scaffolds for Tissue Engineering

Diedkova

Pogrebnjak

Kyrylenko

et al. 2023

ACS Appl. Mater. Interfaces

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New conductive materials for tissue engineering are needed for the development of regenerative strategies for nervous, muscular, and heart tissues. Polycaprolactone (PCL) is used to obtain biocompatible and biodegradable nanofiber scaffolds by electrospinning. MXenes, a large class of biocompatible 2D nanomaterials, can make polymer scaffolds conductive and hydrophilic. However, an understanding of how their physical properties affect potential biomedical applications is still lacking. We immobilized Ti 3 C 2 T x MXene in several layers on the electrospun PCL membranes and used positron annihilation analysis combined with other techniques to elucidate the defect structure and porosity of nanofiber scaffolds. The polymer base was characterized by the presence of nanopores. The MXene surface layers had abundant vacancies at temperatures of 305− 355 K, and a voltage resonance at 8 × 10 4 Hz with the relaxation time of 6.5 × 10 6 s was found in the 20−355 K temperature interval. The appearance of a long-lived component of the positron lifetime was observed, which was dependent on the annealing temperature. The study of conductivity of the composite scaffolds in a wide temperature range, including its inductive and capacity components, showed the possibility of the use of MXene-coated PCL membranes as conductive biomaterials. The electronic structure of MXene and the defects formed in its layers were correlated with the biological properties of the scaffolds in vitro and in bacterial adhesion tests. Double and triple MXene coatings formed an appropriate environment for cell attachment and proliferation with mild antibacterial effects. A combination of structural, chemical, electrical, and biological properties of the PCL−MXene composite demonstrated its advantage over the existing conductive scaffolds for tissue engineering.

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“…A diagram of the test station for measuring the electrical properties of samples was explained in [18] in detail. To record the parameters of two samples simultaneously, the test station included two HIOKI 3532 LCR HiTESTER impedance meters with frequencies in the range of 50 Hz to 5 MHz.…”

Section: Methodsmentioning

confidence: 99%

Dielectric and Electrical Properties of Copper-Polyimide-Copper Structures

Fedotova

2022

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Experimental study of current-voltage (I-V) characteristics and frequency dependences of impedance in copper-Kapton-copper structures in the temperature range 240 – 300 K were carried out. Concentration and mobility of charge carriers thermally excited from traps with exponential distribution by energy in Kapton bulk and metal-Kapton interface and injected from copper electrodes into Kapton were estimated from the fitting of experimental I-V curves within the frame of the model of the space charge limited current (SCLC). Concentration and the width of energy of localized states, arising from the disorder of the Kapton structure, are additionally estimated from the I-V characteristics.

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Test Station for Frequency-Domain Dielectric Spectroscopy of Nanocomposites and Semiconductors

Cited by 40 publications

References 18 publications

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

Polycaprolactone–MXene Nanofibrous Scaffolds for Tissue Engineering

Dielectric and Electrical Properties of Copper-Polyimide-Copper Structures

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