Semiconductor Physics, Quantum Electronics & Optoelectronics, 27 (3), P. 308-314 (2024).
DOI: https://doi.org/10.15407/spqeo27.03.308


Effect of modification of nonwoven textiles with biochar and multi-walled carbon nanotubes on their dielectric properties

O.V. Kovalchuk1,2, J. Prochazkova3, A. Kolanowska4, S. Boncel5,6, J. Mariano7,8, K. Zolochevska9,10, T.M. Kovalchuk11, P. Kopčanský9, I. Safarik3,9,12

1Kyiv National University of Technologies and Design, Kyiv, Ukraine
2Institute of Physics, NAS of Ukraine, Kyiv, Ukraine
3Department of Nanobiotechnology, ISBB, Biology Centre, Czech Academy of Sciences, Ceske Budejovice, Czech Republic
4Institute of Chemistry, University of Silesia in Katowice, Poland
5Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Poland
6Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Silesian University of Technology, Poland
7Department of Physics, FCT, Universidade do Algarve, Portugal
8Center of Physics and Engineering of Advanced Materials, Lisboa, Portugal
9Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
10Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University, Kosice, Slovakia
11V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, Kyiv, Ukraine
12Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Olomouc, Czech Republic
*Corresponding author e-mail: akoval@knutd.com.ua




Abstract. Dielectric properties of native nonwoven textile as well as textile with bound biochar and multi-walled carbon nanotubes in the frequency range of 10 to 5·105 Hz and at the temperatures of 30 to 60 °C have been investigated. The capacity of native nonwoven textile has been shown to decrease with the temperature according to the Arrhenius law. The activation energy of the temperature dependence of the capacity has been estimated to be 0.09 eV. It has been demonstrated that regardless of the temperature, the frequency dependence of the resistance of the nonwoven textile can be described by two exponential functions. In the presence of bound biochar and multi-walled carbon nanotubes in the nonwoven textile, the conductivity current was 4 orders of magnitude greater than the bias current and increased with the temperature according to the Arrhenius law. The activation energy of the temperature dependence of the inverse resistance (an analogue of the conductivity for homogeneous samples with the same dimensions) has been estimated to be 0.19 eV for the samples with multi-walled carbon nanotubes and 0.62 eV for the samples with bound biochar.

Keywords: nonwoven textile, bound biochar, multi-walled carbon nanotubes, dielectric properties, scanning electron microscopy, activation energy of conductivity, semiconducting character of conductivity.

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