Yazar "Sevik, Cem" için listeleme
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Ab initio calculations of martensitic phase behavior in Ni2FeGa magnetic shape memory alloys
Soykan, C.; Kart, S. Özdemir; Sevik, Cem; Çağın, Tahir (Elsevier Science Sa, 2014)A series of spin polarized energy calculations based on density functional theory (DFT) have been carried out to investigate the structural, magnetic, electronic and mechanical properties of Ni2FeGa magnetic shape memory ... -
Achieving Fast Kinetics and Enhanced Li Storage Capacity for Ti3C2O2 by Intercalation of Quinone Molecules
Siriwardane, Edirisuriya M. D.; Demiroğlu, İlker; Sevik, Cem; Çakır, Deniz (American Chemical Society, 2019)Using first-principles calculations, we demonstrated that high lithium storage capacity and fast kinetics are achieved for Ti3C2O2 by preintercalating organic molecules. As a proof-of-concept, two different quinone molecules, ... -
Assessment on lattice thermal properties of two-dimensional honeycomb structures: Graphene, h-BN, h-MoS2, and h-MoSe2
Sevik, Cem (Amer Physical Soc, 2014)The linear thermal expansion coefficients of two-dimensional honeycomb structures graphene, h-BN, h-MoS2, and h-MoSe2 are systematically studied by using first-principles based quasiharmonic approximation. This approach ... -
Assessment on the Accuracy of Piezoelectric Property Calculations of Single Layer Two Dimensional Hexagonal Crystals
Sevik, Cem (2017)The finite difference and the density functional perturbation theory based piezoelectric property calculation methods are applied to the novel two dimensional hexagonal materials named as group II-VI monolayers and transition ... -
A bottom-up route to enhance thermoelectric figures of merit in graphene nanoribbons
Sevinçli, Haldun; Sevik, Cem; Çağın, Tahir; Cuniberti, Gianaurelio (Nature Publishing Group, 2013)We propose a hybrid nano-structuring scheme for tailoring thermal and thermoelectric transport properties of graphene nanoribbons. Geometrical structuring and isotope cluster engineering are the elements that constitute ... -
A comparative device performance assesment of CVD grown MoS2 and WS2 monolayers
Sar, Hüseyin; Özden, Ayberk; Yorulmaz, Büşra; Sevik, Cem; Perkgöz, Nihan Kosku; Ay, Feridun (Springer, 2018)In this study, optical and electronic transport properties of chemical vapor deposition (CVD) grown 2D WS2 and MoS2 based transistors and photodetectors are investigated and compared in ambient air by using 2D flakes grown ... -
Control of Optical Amplification Process with Extremely Low Background Loss in Er:Al2O3 Waveguides
Demirtaş, Mustafa; Odaci, Cem; Perkgöz, Nihan Kosku; Sevik, Cem; Ay, Feridun (IEEE, 2017)We report on record low-loss single mode a-Al2O3 planar waveguides and growth optimization of a-Er2O3 layers to control erbium-doping level of a-Al2O3 layers realized using Atomic Layer Deposition (ALD). Effect of growth ... -
CVD grown 2D MoS2 layers: A photoluminescence and fluorescence lifetime imaging study
Özden, Ayberk; Sar, Hüseyin; Yeltik, Aydan; Madenoğlu, Büşra; Sevik, Cem; Ay, Feridun; Perkgöz, Nihan Kosku (Wiley-V C H Verlag GMBH, 2016)In this letter, we report on the fluorescence lifetime imaging and accompanying photoluminescence properties of a chemical vapour deposition (CVD) grown atomically thin material, MoS2. mu-Raman, mu-photoluminescence (PL) ... -
CVD growth of monolayer MoS2: Role of growth zone configuration and precursors ratio
Özden, Ayberk; Ay, Feridun; Sevik, Cem; Perkgöz, Nihan Kosku (IOP Publishing LTD, 2017)Single-layer, large-scale two-dimensional material growth is still a challenge for their wide-range usage. Therefore, we carried out a comprehensive study of monolayer MoS2 growth by CVD investigating the influence of ... -
Determination of Dynamically Stable Electrenes toward Ultrafast Charging Battery Applications
Kocabaş, Tugbey; Özden, Ayberk; Demiroğlu, İlker; Çakır, Deniz; Sevik, Cem (American Chemical Society, 2018)Electrenes, an atomically thin form of layered electrides, are very recent members of the 2D materials family. In this work, we employed first principle calculations to determine stable, exfoliatable, and application-promising ... -
A distinct correlation between the vibrational and thermal transport properties of group VA monolayer crystals
Kocabaş, Tugbey; Çakır, Deniz; Gülseren, Oğuz; Ay, Feridun; Perkgöz, Nihan Kosku; Sevik, Cem (Royal Soc Chemistry, 2018)The investigation of thermal transport properties of novel two-dimensional materials is crucially important in order to assess their potential to be used in future technological applications, such as thermoelectric power ... -
Electronic and mechanical properties of stiff rhenium carbide monolayers: A first-principles investigation
Siriwardane, Edirisuriya M. D.; Karki, Pragalv; Sevik, Cem; Çakır, Deniz (Elsevier Science BV, 2018)In this study, we predicted two new stable metallic Re-C based monolayer structures with a rectangular (r-ReC2) and a hexagonal (h-Re2C) crystal symmetry using first-principle calculations based on density functional theory. ... -
Electronic, phononic, and thermoelectric properties of graphyne sheets
Sevinçli, Haldun; Sevik, Cem (Amer Inst Physics, 2014)Electron, phonon, and thermoelectric transport properties of a-, b-, c-, and 6,6,12-graphyne sheets are compared and contrasted with those of graphene. a-, b-, and 6,6,12-graphynes, with direction dependent Dirac dispersions, ... -
Engineering electronic properties of metal-MoSe2 interfaces using self-assembled monolayers
Çakır, Deniz; Sevik, Cem; Peeters, Francois M. (Royal Soc Chemistry, 2014)Metallic contacts are critical components of electronic devices and the presence of a large Schottky barrier is detrimental for an optimal device operation. Here, we show by using first-principles calculations that a ... -
Equilibrium limit of thermal conduction and boundary scattering in nanostructures
Haskins, Justin B.; Kınacı, Alper; Sevik, Cem; Çağın, Tahir (Amer Inst Physics, 2014)Determining the lattice thermal conductivity (kappa) of nanostructures is especially challenging in that, aside from the phonon-phonon scattering present in large systems, the scattering of phonons from the system boundary ... -
First-principles investigation of titanium doping into beta-SiAlON crystal in TiN-SiAlON composites for EDM applications
Kandemir, Ali; Sevik, Cem; Yurdakul, Hilmi; Turan, Servet (Elsevier Science Sa, 2015)Following the experimental work on the incorporation of titanium into beta-SiAlON crystal in TiN-SiAlON composites for electrical discharge machining (EDM) applications, Ti doping mechanisms in beta-Si6-z AlzOzN8-z have ... -
Gate induced monolayer behavior in twisted bilayer black phosphorus
Sevik, Cem; Wallbank, John R.; Gülseren, Oğuz; Peeters, Francois M.; Çakır, Deniz (IOP Publishing LTD, 2017)Optical and electronic properties of black phosphorus strongly depend on the number of layers and type of stacking. Using first-principles calculations within the framework of density functional theory, we investigate the ... -
In pursuit of barrierless transition metal dichalcogenides lateral heterojunctions
Aierken, Yierpan; Sevik, Cem; Gülseren, Oğuz; Peeters, Francois M.; Çakır, Deniz (IOP Publishing LTD, 2018)There is an increasing need to understand interfaces between two-dimensional materials to realize an energy efficient boundary with low contact resistance and small heat dissipation. In this respect, we investigated the ... -
Influence of disorder on thermal transport properties of boron nitride nanostructures
Sevik, Cem; Kınacı, Alper; Haskins, Justin B.; Çağın, Tahir (Amer Physical Soc, 2012)The impact of isotopes on thermal transport in boron nitride nanotubes (BNNTs) and boron nitride white graphene is systematically studied via molecular dynamic simulations. By varying the concentration of the B-10 isotope ... -
The influence of surface functionalization on thermal transport and thermoelectric properties of MXene monolayers
Sarıkurt, Sevil; Çakır, Deniz; Keceli, Murat; Sevik, Cem (Royal Soc Chemistry, 2018)The newest members of a two-dimensional material family, involving transition metal carbides and nitrides (called MXenes), have garnered increasing attention due to their tunable electronic and thermal properties depending ...
