Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Nanotechnology


Preparation of NanoPorous Alumina by Anodization Method and Study of Their Structural Properties

Ali J Addie

Engineering and Technology Journal, 2016, Volume 34, Issue 5, Pages 176-185

Highly ordered nanoporous alumina structures have been prepared by electrochemical anodization for high purity Al-foils, electrolyte cell parameters have controlled to obtain optimum preparation conditions. Anodization potential, current density and electrolyte concentration effects on the prepared porous layer, surface morphology have been studied by scanning electron microscope and energy dispersive x-ray spectroscopy have used to analyze chemical composition of the samples.
Results of the SEM show that the pore size was about 20-80 nm and it depends strongly on the anodization potential & electrolyte concentration, the higher anodization potential can destroy the barrier layer & cause a hi-dissolution rate of aluminum in the electrolyte, while with low potential a porous layer cannot be obtained. The highest degree of order and hexagonal distribution of pores was obtained with anodization potential of 20 volts and 0.2M of the electrolyte concentration. Results of EDS confirm the formation of the aluminum oxide layer with traces of sulfur which belong to the electrolyte.

Structural and Electric Investigations of Al-doped nano Nickel Ferrite

Salam H. Ali Al-Hadad; Shahad Humam Sulaiman

Engineering and Technology Journal, 2015, Volume 33, Issue 3, Pages 443-452

Aluminum doped nickel ferrite samples with composition NiFe2-xAlxO4 (where; x=0, 0.2 ,0.4, 0.6, 0.8, 1, 1.2, 1.4), were synthesized by using sol-gel auto combustion method at temperature about 200°C,then pelletized and sintered at different temperatures (900, 1000, 1100 and 1200°C) . The present work focuses on studying the structural and electrical properties of Ni-Al ferrite by using many analysis’s like x-ray diffraction, LCR meter, FTIR and AFM. The results show that the chemical composition has a major effect on electrical, structural, and physical properties. The result also showed that the dielectric constant and dielectric loss decreased with the increase of the Al content in Ni-Al ferrite sintered at 12000C.

Characteristics and Evaluation of Nano Electronic Devices

Hanan A. R. Akkar; Sarmad Khalooq

Engineering and Technology Journal, 2014, Volume 32, Issue 3, Pages 486-497

Recent developments in nanotechnology have demonstrated that it is feasible to manufacture Nano electronics devices using Carbon Nano Tubes (CNTs) because the mobility between the channels is increased while the switching delay is decreased. The devices based on Nano scale objects with well-defined structure and original electronic properties are great interest for the development of innovative electronic circuits. In this paper, a proposed design of carbon Nano tube transistors, Nano RAMS, Nano wires, Nano Flip Flops and Nano Diodes are presented. The Carbon Nano Tube Field Effect Transistor (CNT FET) leads to an area reduction, density of carbon Nano tube as well as the power consumption is decreased when it is compared with MOSFET. The comparison between Nano CMOS and CNTFET shows that CNTFET is very promising and superior technology for circuit design access time reduction with temperature increasing which is opposite to the Nano CMOS behavior delay. The results obtained are useful in characterizing and evaluating performance of Nano devices and related circuits. The results proved that CNTFET appears to be the best device in future for VLSI. The modeling and simulation has been implemented using MATLAB program.