Browsing by Keywords "Alumina"
Now showing items 1-14 of 14
-
Area-selective atomic layer deposition using an inductively coupled plasma polymerized fluorocarbon layer: A case study for metal oxides
(American Chemical Society, 2016)Area-selective atomic layer deposition (AS-ALD) has attracted immense attention in recent years for self-aligned accurate pattern placement with subnanometer thickness control. Here, we demonstrate a methodology to achieve ... -
Design, fabrication, and characterization of normally-off GaN HEMTS
(Bilkent University, 2019-07)GaN-based high-electron-mobility transistors (HEMTs) have been developing rapidly from the time when they were first demonstrated in the 1990s. They have consistently been presented as a displacement technology to silicon ... -
Enhancement of photocatalytic NOx abatement on titania via additional metal oxide NOx-storage domains: Interplay between surface acidity, specific surface area, and humidity
(Elsevier, 2020)In this work, we propose a simple and effective preparation procedure to obtain ternary mixed oxides composed of titania (TiO2, P25), alumina (γ-Al2O3) and calcium oxide (CaO) functioning as efficient photocatalytic NOx ... -
Fabrication of ALN/GAN MIS-Hemt with SIN as gate dielectric and performance enhancement with ALD deposited alumina
(Bilkent University, 2016-10)Silicon based transistors reached a limit, especially for high power and high frequency applications due to their relatively low bandgap and breakdown voltage. With its higher bandgap and breakdown voltage, GaN based ... -
FTIR spectroscopic study on nickel(II)-exchanged sulfated alumina: nature of the active sites in the catalytic oligomerization of ethene
(Springer, 2002)The nature of the active sites in nickel(II)-exchanged sulfated alumina in the reaction of ethene oligomerization has been studied by means of FTIR spectroscopy of adsorbed CO. It has been established that isolated nickel(I) ... -
Laser-micromachined millimeter-wave photonic band-gap cavity structures
(American Institute of Physics, 1995)We have used laser-micromachined alumina substrates to build a three-dimensional photonic band-gap crystal. The rod-based structure has a three-dimensional full photonic band gap between 90 and 100 GHz. The high resistivity ... -
NOx reduction on a transition metal-free γ-Al2O3 catalyst using dimethylether (DME)
(2008)NO2 and dimethylether (DME) adsorption as well as DME and NO2 co-adsorption on a transition metal-free γ-alumina catalyst were investigated via in-situ transmission Fourier transform infrared spectroscopy (in-situ FTIR), ... -
Oligomerization of ethylene in a slurry reactor using a nickel/sulfated alumina catalyst
(American Chemical Society, 1997)During the oligomerization of ethylene over heterogeneous catalysts, the production of α-olefins may be lowered because of an accompanying deactivation of catalyst resulting from strong adsorption of products, by isomerization ... -
Photonic band gap structures for WDM applications
(IEEE, 2002)A new structure by combining a single cavity and coupled-cavity waveguides (CCWs) for wavelength division multiplexing (WDM) applications was proposed. As such, a structure in which the coupling between the cavity mode and ... -
Plasmonically enhanced silicon infrared Schottky detector
(Bilkent University, 2011) -
Protein-releasing conductive anodized alumina membranes for nerve-interface materials
(Elsevier Ltd, 2016)Nanoporous anodized alumina membranes (AAMs) have numerous biomedical applications spanning from biosensors to controlled drug delivery and implant coatings. Although the use of AAM as an alternative bone implant surface ... -
Sorption behavior of radioiodine on organic rich soil, alumina and clay minerals
(Bilkent University, 1992)Sorption behavior of radioiodine on organic rich soil, alumina, chlorite- illite clay mixture, kaolinite and bentonite have bc;en studied using the batch method. was used as tracer. Characterization of samples were done ... -
Target classification with simple infrared sensors using artificial neural networks
(IEEE, 2008-10)This study investigates the use of low-cost infrared (IR) sensors for the determination of geometry and surface properties of commonly encountered features or targets in indoor environments, such as planes, corners, edges, ... -
XPS analysis with external bias: a simple method for probing differential charging
(John Wiley & Sons Ltd., 2004)The XPS spectra of thermally grown oxide layers on Si, Al, W and Hf substrates have been recorded while the samples were subjected to external d.c. voltage bias. The bias induces additional shifts in the measured binding ...
