particles in such systems. Near the percolation threshold, the volume fraction of
the skeleton belonging to the IC is an insignificant fraction of its total volume, and
the bulk of the IC is concentrated in the dead ends. Near the percolation threshold
in composites containing metal nanoparticles, an infinite cluster is more sinuous as
compared to IC in composites containing microdispersed particles.
These results show that for the composites developed by us with a
characteristic particle size of the order of 3-4 nm [4], apparently the "quantum
effect" appears.
To confirm this assumption, we have improved the existing method of
obtaining composite polymer materials based on polyethylene containing
semiconductor nanoparticles of cadmium sulfide (CdS).
In [7], it was shown that with a decrease in semiconductor nanoparticles,
starting from a certain size, the “quantum effect” appears; a decrease in the width
of the energy bands is observed, which leads to an increase in the energy of optical
transitions and a shift of the optical spectrum in the short-wavelength region.
For the nanocomposite materials developed by us containing cadmium sulfide
nanoparticles, their optical properties were studied [8]. In the luminescence
spectrum, a shift of the bands to the short-wavelength region was observed when
the nanoparticle size was less than 4 nm.
Fotoenergetikada nanostrukturali yarimo‘tkazgich materiallar
II xalqaro ilmiy anjumani
19-20 noyabr 2021 yil
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As a result of the research carried out, recommendations were developed for
the practical application of composite materials containing metal nanoparticles
with special electrophysical properties.
References
1. Umar Abdurakhmanov, Shamil Sharipov, Yayra Rakhimova, Munira
Karabaeva, and Maksudbek Baydjanov. Conductivity and Permittivity of Nickel-
Nanoparticle-Containing Ceramic Materials in the Vicinity of Percolation
Threshold.// J. Am. Ceram. Soc.2006.V.89.№ 9. pp. 2946–2948.
2. Umarbek Abdurakhmanov, Yayra Rakhimova, and Gafurjan Mukhamedov,
Isaac Balberg. Temperature Dependence of the Conductivity in Ceramic Materials
Containing Nickel Nanoparticles.//. J. Am. Ceram. Soc.2009. V. 92.№.3. рр. 661–
664.
3. U. Abdurakhmanov, F. T. Boitmuratov, G. I. Mukhamedov, A. S. Fionov,
and G. Yu. Yurkov. Electric Conductivity of Composite Materials Based on
Phenylon Matrices and Nickel Particles.//.
Journal of Communications Technology
and Electronics, 2010, Vol. 55, No. 2, pp. 221–224.
4. U. Abdurakhmanov, F. T. Boimuratov, G. I. Mukhamedov, A. S. Fionov,
and G. Yu. Yurkov. The Permittivity of Phenylone_Based Composites with
Nickel Particles.//. Journal of Communications Technology and Electronics, 2011,
Vol. 56, No. 2, pp. 142–144.
5 Baymuratov F.T., Abdurakhmanov U., Yurkov G.Y., Umarov A.V. Local
Energy of Activation of Conductivity of Phenylene-Based Composite Materials
Containing Nickel Nanoparticles. IOSR Journal of Polymer and Textile
Engineering (IOSR-JPTE), V 7, N 2, 2020, pp. 01-09.
6 Balberg I., Azulay D., Toker D., Millo O.// Int. J.Mod.Phys.2004.V.18.P.
2091
7. V.Ya. Demikhovskiy, G.A. Vugalter. Fizika kvantivix nizkorazmernix
struktur. М.: Logos.2000. (in Russian)
8. . А.V. Umarov, U Abdurakhmanov, H. E. Khamzayev, N.T. Kattaev and A.
G. Tozhiboev. Synthesis and Structural Investigations of Metal-Containing
Nanocomposites Based on Polyethylene. Physical sciences, Z. Naturforsch, 2019,
V. 74, N 3, pр. 183-187
.
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