Papers by Keyword: PET Substrate

Abstract: This paper described the use of inkjet printing to design multiband fractal antenna based on Sierpinski arrowhead curve architecture. The antenna is printed using silver nanoparticles on a plastic substrate PET (Polyethylene terephthalate). Using a combination of printing technology and fractal geometry to achieve very advanced parameters in three frequency bands 650 MHz, 1,57 GHz and 2,5 GHz. Multiband antenna may find application in specific portable devices, where it would be possible to implement the antenna housing facilities in the form of printing.

Abstract: A series of Ag films with different thicknesses were prepared on polyethylene terephthalate (PET) substrates under identical conditions by thermal evaporation. The effect of the thickness on the optical and electrical properties of the films was studied. The morphology of the samples was investigated by atomic force microscopy (AFM). The optical and electrical properties were measured by spectrophotometer and four-point probe method, respectively. The experimental results show that the reflectance increases, while transmittance and resistivity decrease with the increase of the thickness. There exists a critical thickness of the film and it is 75 nm in this experiment. The optical and electrical properties of Ag films on PET substrates with thickness larger than critical thickness, are close to those of the conventional bulk silver. The resistivity of the 150-nm film is 3.0±0.2 μΩ•cm, which is lower than that of the 250-nm Ag film grown on BK-7 glass substrates.

Abstract: The transparent conducting films have been investigated extensively because of their excellent electrical and optical properties in many applications. For producing the LCD (Liquid Crystal Displays) and OLED (Organic Light-Emitting Diode), the transparent conductive films are mainly deposited on the glass. Using the plastic substrate has the advantages of low cost, light-weighted, and flexible characteristics; it is considered as the candidate substrate material for the portable and flexible LCD. The surface roughness measured by AFM was in the range 2.63~11.1nm. The result shows that the crystallite size increases with increasing the r.f. power. The microstructure of ZnO film has a proud (002) orientation. The average transmittance of ZnO film can be obtained over 80% in the visible spectrum. The lowest resistivity obtained is 4.0×10-3 ohm-cm. The adhesion between ZnO films and PET substrate is good because there is no separate observed in this study.