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Microwave dielectric properties of polymer composite nanomaterials based on CdS nanoparticles in low density polyethylene matrix

Keywords:

S.Yu. Molchanov – Post-graduate Student, Department «Electronics and telecommunications», Yuri Gagarin State Technical University of Saratov
E-mail: canishe@yandex.ru
N.M. Ushakov – Dr. Sc. (Phys.-Math.), Head of Laboratory of Submicron Electronics, Saratov branch of Kotel'nikov IRE of RAS
E-mail: nmu@bk.ru
I.D. Kosobudsky – Dr. Sc. (Chem.), Leading Research Scientist, Laboratory of Submicron Electronics, Saratov branch of Kotel'nikov IRE of RAS; Professor, Department of Chemistry, Yuri Gagarin State Technical University of Saratov
E-mail: ikosobudskyi@gmail.com


The study of polymeric composite nanomaterials attracts much attention in connection with the possibility of a significant improvement in mechanical, thermal, electrical and optical properties compared to the pure polymer. Nanoparticles (NPs) of cadmium sulfide dispersed in low density polyethylene (LDPE) can significantly change the microwave dielectric properties of such a composite. CdS NPs in the bulk of a polymer matrix with a mass concentration of 10 to 30 wt.% were fabricated on the basis of the method of high-speed thermal decomposition. The dimensions of the CdS nanoparticles were from 4 nm to 9 nm. Experimental samples based on polymer nanocomposites in the form of thick films with a thickness of 80 to 100 μm were made by thermal compression. The introduction of CdS NPs into LDPE matrix increases the value of the dielectric constant by 45%, and the dielectric and linear losses by almost 2 orders of magnitude. The complex dielectric constant of thick-film samples was measured by the S parameter method at frequencies from 4 to 8 GHz at room temperature (25°C). A dimensional effect in a change of the frequency microwave dielectric properties of polymeric composite materials associated with the NPs size was observed for 20 wt.% CdS samples. As the size of the CdS NPs increases, the dielectric loss of the material increases. The CdS-LDPE polymer composite nanomaterials have a number of properties in the range from 4 to 8 GHz, such as the weak frequency dependence of the dielectric constant and frequency-dependent losses, which can find practical application in microwave planar devices, for example, in microstrip attenuators.

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