Erkan Demirci

Erkan Demirci
The Scientific & Technological Research Council of Turkey | TUBITAK · BILGEM

Dr.

About

29
Publications
2,834
Reads
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99
Citations
Citations since 2016
7 Research Items
37 Citations
201620172018201920202021202202468
201620172018201920202021202202468
201620172018201920202021202202468
201620172018201920202021202202468
Additional affiliations
August 2010 - October 2015
The Scientific & Technological Research Council of Turkey
Position
  • Senior Researcher
August 2010 - August 2017
June 2005 - June 2010
Graz University of Technology
Position
  • Research Assistant

Publications

Publications (29)
Article
Full-text available
The adsorption behavior of CO on bimetallic Ni/Cu110 surfaces has been studied experimentally by thermal-desorption spectroscopy and theoretically by density-functional theory DFT calculations. The bime-tallic surfaces were produced either by evaporation of nickel or by decomposition of NiCO 4 on Cu110. Adsorption of CO at 180 K on such a bimetalli...
Article
We have studied the adsorption and reaction of methanol on the bare and oxygen precovered Cu(110) surface at 200K using reflectance difference spectroscopy (RDS). On the bare and fully oxygen covered surface, the sticking coefficient is close to zero. In contrast, on the partially oxygen covered surface, a sticking coefficient close to unity is obt...
Article
The adsorption and subsequent reaction of methanol on Cu(110) and on the oxygen stripe phase on Cu(110) was investigated using reflection absorption infrared spectroscopy (RAIRS), temperature-programmed desorption (TPD) and density functional theory (DFT) calculations. It was shown that during high methanol exposures water can coadsorb and it is in...
Conference Paper
In this paper, atmospheric effects on a 1.070 µ m wavelength laser beam have been investigated by measuring power-in-the-bucket and beam profile on a horizontal path with different lengths. Simulations of atmosphere and laser beam interactions matching with the experimental conditions are carried out to make a comparison.
Article
Full-text available
We present a nanosecond laser ablation of Si(111) surfaces with diffraction-free (Bessel\(J_0\)) beams. Experimental results compared with theoretical predictions show that Bessel beams give possibility of straightforward micro-structuring of Si(111). Only central spot could damage the surface provided that the laser pulse energy is in the energy r...
Conference Paper
Lasers in the nanosecond pulsed regimes are relatively cheaper than ultrafast regimes but yields the larger heat-affected and ablation zone around the focal diameter. Ablation mechanism of laser in ultra-fast regime is explained totally by non-thermal modal. On the other hand, pulse duration is much longer in nanosecond regime to transfer enough en...
Preprint
Full-text available
We present here a nanosecond laser ablation of Si(111) wafer with diffraction-free (Bessel-$J_0$) beams. First, the Axicon a conical shaped optical element for beam shaping is characterized with a visible and infrared light sources. Then, ablation profiles are obtained with Bessel beams generated for $\alpha=1^{\circ}$ and $\alpha=20^{\circ}$ base...
Article
Full-text available
Nanosecond laser ablation of p-type Si(111) wafer is presented under an ambient, a water and a glycerin conditions. Effects of pulse energy, number of pulses and type of environment are systematically analyzed with an Optical Profilometer, a Scanning Electron Microscope and an Atomic Force Microscope. Obtained results are compared with Zemax∘-EE si...
Preprint
Full-text available
Nanosecond laser ablation of p-type Si(111) wafer is presented under an ambient, a water and a glycerin conditions. Effects of pulse energy, number of pulses and type of environment are systematically analyzed with an Optical Profilometer, a Scanning Electron Microscope and an Atomic Force Microscope. Obtained results are compared with Zemax-EE sim...
Article
Full-text available
This paper presents the simulation of a vane-type magnetron using the commercial electromagnetic software Particle-in-Cell (PIC) solver in CST. The magnetron mainly consist of 18 anode vanes without strap. The resonance frequency has been selected in X band since it has a long production history enabling a ready comparison of computed and measured...
Article
Co-adsorption of hydrogen and CO on Cu(1 1 0) and on a bimetallic Ni/Cu(1 1 0) surface was studied by thermal desorption spectroscopy. Hydrogen was exposed in atomic form as generated in a hot tungsten tube. The Ni/Cu surface alloy was prepared by physical vapor deposition of nickel. It turned out that extended exposure of atomic hydrogen leads not...
Article
Full-text available
The condensation and desorption of nickel tetra-carbonyl (Ni(CO)4) on Cu(110) has been studied by thermal desorption spectroscopy. A quite unusual evolution of the desorption spectra is observed. First a desorption peak appears at around 140K, which disappears with increasing coverage and merges into a clearly separated new desorption peak at aroun...
Conference Paper
Bimetallic surfaces can create new reaction pathways due to the special arrangement of the different adatoms on the surface. In the present study the CO adsorption on clean Cu(110) and Ni/Cu(110) surfaces has been investigated using Thermal Desorption Spectroscopy (TDS), Low Energy Electron Diffraction (LEED), Auger Electron Spectroscopy (AES) and...
Article
Full-text available
Multiplexed thermal desorption spectroscopy was used to study the influence of preadsorbed and postadsorbed deuterium on a methanol monolayer on Pd(111). In particular, the effect of atomic deuterium exposure on the reaction products was examined in detail. Preadsorbed deuterium hinders the formation of chemisorbed methanol and favors physisorption...
Article
Full-text available
An evaluation procedure for the quantitative determination of thermal desorption products based on in-line mass spectrometry is described in detail. This procedure is, in particular, applicable for species which are pumped with high speed and, therefore, yield small signals in conventional mass spectrometry. The evaluation method was applied to the...
Conference Paper
Integral and angle resolved thermal desorption spectroscopy were used to study methanol adsorption and oxidation on clean and oxygen covered Cu(110) surfaces. Special emphasis was put on the Cu-CuO stripe phase, which forms when the Cu(110) surface is covered with 0.25 monolayers of oxygen. In the temperature regime between 200 K and 300 K associat...
Article
Integral and angle resolved thermal desorption spectroscopies were used to study methanol adsorption and oxidation on clean and oxygen covered Cu(110) surfaces. Special emphasis was put on the Cu-CuO stripe phase, which forms when the Cu(110) surface is covered with 0.25 ML of oxygen. In the temperature regime between 200 and 300 K associative deso...
Article
Indium tin oxide (ITO), a transparent conductive oxide, is a wide band gap compound semiconductor with a cubic bixbyte structure. Sn-doped indium oxide (IO) thin films (In:Sn=90:10) were deposited on microscope glass substrates by a sol-gel spin coating technique. The precursor solution was prepared by mixing indium (III) nitrate pentahydrate (In(N...

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Project
In this work 5.5 ns pulsed laser ablation behaviors of indium tin oxide (ITO) thin films on glass were investigated for wavelength at 1064 nm. The ITO thin films thickness of about 100 nm was deposited on fused silica substrate by magnetron sputtering. Effects of pulse energy, number of pulses are systematically analyzed with an Optical Profilometer, a Scanning Electron Microscope (SEM) and an Atomic Force Microscope (AFM). Experimental findings obtained with the different these lpulsed aser parameters are compared by considering ablation threshold and damage morphology due to heat conduction.