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1

Growth Temperature Effect of Atomic-Layer-Deposited GdOx Films

Ryu Sung Yeon, Yun Hee Ju, Lee Min Hwan, Choi Byung Joon

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 3

755--758

EN

Gadolinium oxide (Gd2O3) is one of the lanthanide rare-earth oxides, which has been extensively studied due to its versatile functionalities, such as a high permittivity, reactivity with moisture, and ionic conductivity, etc. In this work, GdOx thin film was grown by atomic layer deposition using cyclopentadienyl (Cp)-based Gd precursor and water. As-grown GdOx film was amorphous and had a sub-stoichiometric (x ~ 1.2) composition with a uniform elemental depth profile. ~3 nm-thick GdOx thin film could modify the hydrophilic Si substrate into hydrophobic surface with water wetting angle of 70°. Wetting and electrical test revealed that the growth temperature affects the hydrophobicity and electrical strength of the as-grown GdOx film.

2

Electrical Characteristics of Tin Oxide Films Grown by Thermal Atomic Layer Deposition

Yoon Seong Yu, Choi Byung Joon

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 3

1041--1044

EN

Tin dioxide (SnO2 ) is an n-type semiconductor and has useful characteristics of high transmittance, excellent electrical properties, and chemical stability. Accordingly, it is widely used in a variety of fields, such as a gas sensor, photocatalyst, optoelectronics, and solar cell. In this study, SnO2 films are deposited by thermal atomic layer deposition (ALD) at 180°C using Tetrakis(dimethylamino)tin and water. A couple of 5.9, 7.4 and 10.1nm-thick SnO2 films are grown on SiO2 /Si substrate and then each film is annealed at 400°C in oxygen atmosphere. Current transport of SnO2 films are analyzed by measuring current – voltage characteristics from room temperature to 150°C. It is concluded that electrical property of SnO2 film is concurrently affected by its semiconducting nature and oxidative adsorption on the surface.

3

Investigation of the Electrical Properties and Electromagnetic Shielding Effectiveness of Polypyrrole Coated Cotton Yarns

Yildiz Z., Usta I., Gungor A.

Fibres & Textiles in Eastern Europe

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2013

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Vol. 21, no. 2 (98)

32--37

EN

Polypyrrole (PPy) coated cotton yarns were prepared by the vapour phase polymerisation technique at various initiator concentrations. Iron (III) chloride (FeCl3) was used as the initiator at four different concentrations (0.2, 0.4, 0.6 & 0.8 mol/l) respectively. In this work, the effects of initiator concentration on the tensile, electrical and morphological properties of the cotton yarns were investigated. PPy coated cotton yarns were woven on a handloom for the investigation of electromagnetic shielding effectiveness. The fabric samples prepared were evaluated in terms of shielding behavior. Scanning electron microscopy (SEM) analysis showed that the yarn treated with 0.4 mol/l initiator concentration gave the most uniform PPy layer and highest shielding value. The existence of PPy was proved by using Fourier transform infrared spectroscopy (FTIR) analysis.

PL

Bawełniane przędze pokryte polipyrolem (PPy) wytworzono techniką polimeryzacji w fazie gazowej w różnych stężeniach inicjatora. Jako inicjator zastosowano FeCl3 o czterech różnych stężeniach (0,2; 0,4; 0,6 i 0,8 mol/l). Zbadano wpływ stężenia inicjatora na rozciąganie, oraz elektryczne i morfologiczne właściwości przędz bawełnianych. W celu zbadania efektywności ekranowania pola elektromagnetycznego przędze bawełniane powlekane PPy były tkane ręcznie na krośnie. Przygotowane próbki tkanin oceniano pod względem właściwości ekranujących. Analiza SEM wykazała, że z przędzy z dodatkiem inicjatora o stężeniu 0,4 mol/l uzyskano najbardziej jednolitą warstwę PPy i najwyższą wartość ekranowania. Obecność PPy potwierdzono za pomocą spektroskopii w podczerwieni z transformacją Fouriera (FTIR).

4

Chemically modified polymethyl methacrylate in a magnesium-polymer cell

Sienicki W., Wojtewicz M.

International Letters of Chemistry, Physics and Astronomy

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2012

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Vol. 4

76-81

EN

As a result of the electrophilic protonation of a carboxyl group of di electric polymethylmethacrylate (PMMA) with trifluoromethanesulfonic acid (CF3SO3H), a modified conducting polymer material was produced in the shape of a thin elastic lamina and a dense conductive gel, whose density was 1.26 g/cm3. These polymers conduct electricity, do not dissolve In either cold or warm water and are also resistant to weather conditions. Their conductivity in room temperature is 7.5ź10-3 Scm-1 and it greatly increases above 154 K. Activation energy Ea decreases with increasing temperature in the range 154 K - 300 K from 1.47 eV to 0.69 eV. The magnesiumpolymer (Mg-Poly) cell is constructed with magnesium as the anode and conductive PMMA as the cathode and both electrodes are electrically connected with a polymer gel electrolyte. The ratek voltage of this cell is 2.4 V.