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Polymer composite nanomaterials based on low density polyethylene for radiotechnical applications

Keywords:

N.M. Ushakov – Dr. Sc. (Phys.-Math.), Head of Laboratory of Submicron Electronics, Saratov branch of Kotel\'nikov IRE of RAS; Professor, Department «Electronics and telecommunications», Yuri Gagarin State Technical University of Saratov 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 V.Ya. Podvigalkin – Ph. D. (Eng.), Leading Engineer, Laboratory of Submicron Electronics, Saratov branch of Kotel\'nikov IRE of RAS E-mail: podvigalkin@ya.ru


The purpose of this paper is to show the new results of experimental studies of polymer composite nanomaterials based on low-density polyethylene as the thick-film resistor-capacitor structures for microassemblies, memory elements, and thick-film microwave radar absorbing coatings. Microassemblies based on polymer thick films (50…100 µm) of nanocomposite materials were as test-board, consisting of the test resistors and capacitors test. Three basic composition of nano powders were synthesized. Two compositions were prepared from 10…25 wt.% ZnO and 10 wt.% CdS nanoparticles stabilized in LDPE matrix. Another composition has been fabricated based on 10…20 wt.% CeO2 nanoparticles stabilized on surface of diamond microparticles with 10 µm size in dielectric matrix. The measured resistance and capacitance values of the microassemblies ranged from 150 Ohm to 5 kOhm, and the capacitance values – in the range from 1 to 3 pF. The results of an experimental study of memory effect and switching to polymer composite nanomaterials based on low-density po-lyethylene by irradiating an electron and a pulse UV laser streams are shown. Experimental samples were nanocomposites thick films based on ZnO and CdS nanoparticles with a concentration of 5 to 25 wt.% stabilized in LDPE matrix. Dielectric and conductive states of the sample before and after laser irradiation are shown. Under the influence of an applied dc electric field (5 V) the sample goes to the initial state. Moreover, if the insulating state changed slightly, the conductivity of the sample was increased 40 times. The model memory effect in polymer composite nanomaterials is discussed. The measured results of the complex dielectric constant and losses in the 40 wt.% Fe/Fe3O4-LDPE thick films in the range from 75 to 110 GHz are shown. The microwave loss maximum for the pure LDPE film occurs at frequencies below 70 GHz and constitute 4…5 dB/mm. For LDPE matrix with iron nanoparticles filling MW loss maximum shifts to higher frequencies (92…93 GHz) and is about 50 dB/mm.
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