Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

SHIELDING EFFECTS IN THIN FILMS OF CARBON NANOTUBES WITHIN MICROWAVE RANGE
Alesia Paddubskaya^a, Mikhail Shuba^b, Gintaras Valušis^a, Polina Kuzhir^b, Sergey Maksimenko^b, Alexander Okotrub^c, Emmanuel Flahaut^d, Anne Marie Galibert^d, Brigitte Soula^d, Vanessa Fierro^e, and Alain Celzard^e
^aCenter for Physical Sciences and Technology, Savanorių 231, LT-01108 Vilnius, Lithuania
E-mail: paddubskaya@gmail.com
^bInstitute for Nuclear Problems, Belarus State University, Bobruiskaya Str. 11, 220050 Minsk, Belarus
^cNikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, Acad. Lavrentiev Ave. 3, 630090 Novosibirsk, Russia
^dUniversity de Toulouse; CNRS/UPS/INP; Institut Carnot CIRIMAT, 118, route de Narbonne, F-31062 Toulouse Cedex 9, France
^eInstitut Jean Lamour – UMR CNRS – Université de Lorraine 7198, ENSTIB, 27 rue Philippe Seguin, CS 60036, 88026 Epinal Cedex, France

Received 7 October 2015; revised 19 February 2016; accepted 21 June 2016

The electromagnetic shielding properties of thin films comprising different types of carbon nanotubes (CNTs) were analysed in the microwave frequency range (26–36 GHz). A comparative analysis of the shielding properties was achieved for films based on long and short single-, double- and multi-walled CNTs. The experimental results proved that long-length single-walled CNTs demonstrate the highest interaction with the electromagnetic (EM) field, thereby providing the best shielding efficiency. At the same time, double-walled CNTs demonstrate a higher level of absorption ability (50%) along with the overall high EM shielding efficiency (88%), which makes them attractive for using in nanoelectronics screens as they produce the smallest secondary EM pollution.

Keywords: microwave frequency range, electromagnetic response, carbon nanotubes
PACS: 77.84.Jd, 78.67.Ch

EKRANAVIMO REIŠKINIAI PLONUOSIUOSE ANGLIES NANOVAMZDELIŲ SLUOKSNIUOSE MIKROBANGŲ RUOŽE

Alesia Paddubskaya^a, Mikhail Shuba^b, Gintaras Valušis^a, Polina Kuzhir^b, Sergey Maksimenko^b, Alexander Okotrub^c, Emmanuel Flahaut^d, Anne Marie Galibert^d, Brigitte Soula^d, Vanessa Fierro^e, Alain Celzard^e^aFizinių ir technologijos mokslų centras, Vilnius, Lietuva
^bBaltarusijos valstybinis universitetas, Minskas, Baltarusija
^cRusijos mokslų akademijos Sibiro skyriaus Nikolajevo neorganinės chemijos institutas, Novosibirskas, Rusija
^dTulūzos universitetas, Prancūzija
^eLotaringijos universitetas, Prancūzija

Naujų ultralengvų ir mažų gamybos sąnaudų reikalaujančių nanomedžiagų paieška bei tyrimai yra vienas svarbiausių uždavinių gerinant mikrobangų ruožo elektroninių prietaisų darbo patikimumą. Šiame darbe tyrinėjami ekranavimo reiškiniai plonuosiuose sluoksniuose, sudarytuose iš įvairaus ilgio vienasienių, dvisienių ir daugiasienių anglies nanovamzdelių. Eksperimentiniai tyrimai 26–36 GHz dažnių ruože parodė, kad ekranavimo efektyvumas priklauso nuo anglies nanovamzdelių ilgio. Ilgi nanovamzdeliai intensyviai sąveikauja su mikrobangų elektromagnetiniu lauku ir užtikrina didžiausią ekranavimo efektyvumą. Sluoksniuose su trumpais anglies nanovamzdeliais stebimas silpnas slopinimas dėl stipriai pasireiškiančio depoliarizacijos efekto. Lyginant rezultatus prieita prie išvados, kad ilgi pavieniai anglies nanovamzdeliai labiau tinkami bendram efektyviam ekranavimui (88 % efektyvumas), dvisieniai nanovamzdeliai geriau absorbuoja mikrobangų spinduliuotę (50 % absorbcija), todėl tinkami naudoti kaip nanoelektriniai ekranai, padedantys išvengti papildomos elektromagnetinių bangų interferencijos, o daugiasieniai nanovamzdeliai ekranuoja mažiausia (55 % efektyvumas), bet išlieka tinkama absorbuojanti nanomedžiaga tirtajame dažnių ruože.

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