Structural-morphological and Conductive Properties of С-Al2O3 Composite Materials

Authors V.I. Mandzyuk1 , I.F. Mironyuk1, Y.O. Kulyk2, N.A. Bezruka3

1 Vasyl Stefanyk Precarpathian National University, 57, Shevchenko St., 76018 Ivano-Frankivsk, Ukraine

2 Ivan Franko National University, 8, Kyrylo and Mefodiy St., 79005 Lviv, Ukraine

3 Ivano-Frankivsk National Medical University, 2, Halytska St., 76018 Ivano-Frankivsk, Ukraine

Issue Volume 12, Year 2020, Number 1
Dates Received 01 December 2019; revised manuscript received 15 February 2020; published online 25 February 2020
Citation V.I. Mandzyuk, I.F. Mironyuk, Y.O. Kulyk, N.A. Bezruka, J. Nano- Electron. Phys. 12 No 1, 01013 (2020)
PACS Number(s), 61.43.Gt, 81.05.Uw
Keywords Porous carbon (3) , Composite material (3) , Fractal structure (3) , Specific surface, Specific conductivity.

The structure, morphology and conductive properties of C-Al2O3 composite materials depending on the percentage content of the oxide phase are investigated using small-angle X-ray scattering, low-temperature porometry and impedance spectroscopy. It has been found that the structure of the explored materials is formed by mass fractals as a result of the carbon cluster aggregation on the surface of alumina particles. The reduction in the fractal dimension from 2.80 to 1.90 and the corresponding loosening of the structure are due to the reduction of the carbon phase volume in the composite material. Increase in the percentage content of the oxide component also leads to an increase in the porosity (from 0.62 to 0.80), a decrease in the total (from 424 to 300 m2/g according to the small-angle X-ray scattering) and open (from 356 to 14 m2/g according to the low-temperature porometry) specific surfaces and increase in the volume fraction of mesopores from 51 to 70 %. Addition to the carbon precursor of the oxide component results in a decrease in the electrical conductivity from 26.2 Ohm – 1∙m – 1 (for pure carbon material) to 0.4 Ohm – 1∙m – 1 (at 30 % Al2O3 content) due to the formation of additional barriers to electron pathways in the form of alumina particles parallel to a branched pore system in the carbon matrix.

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