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RISS 인기검색어
- 검색키워드
- 저자 : Shahram Solaymani (검색결과 4 건)
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Microstructure and Micromorphology of Cu/Co Nanoparticles: Surface Texture Analysis
Ştefan Ţălu,Miroslaw Bramowicz,Slawomir Kulesza,Atefeh Ghaderi,Vali Dalouji,Shahram Solaymani,Zahra Khalaj 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.5
This paper analyses the three-dimensional (3-D) surface texture ofCu/Co thin films deposited by DC-Magnetron sputtering methodon the silicon substrates. The prepared Cu/Co nanoparticles wereused as research materials. Three groups of samples were depositedon silicon substrates in the argon atmosphere and gradually cooleddown to room temperature. The crystalline structures and elementalcompositions were analyzed by X-ray diffraction (XRD) spectrumwith conventional Bragg-Brentano geometry. X-ray diffractionprofile indicates that Co and Cu interpenetrating crystallinestructures are formed in these films. The sample surface imageswere recorded using atomic force microscopy (AFM) and analyzedby means of the fractal geometry. Statistical, fractal and functionalsurface properties of prepared samples were computed to describemajor characteristics of the spatial surface texture of Cu/Conanoparticles. Presented deposition method is a versatile, costeffective,and simple method to synthesize nano- and microstructuresof Cu/Co thin films. This type of 3-D morphology allows tounderstand the structure/property relationships and to investigatedefect-related properties of Cu/Co nanoparticles. Presented resultsconfirm the possibility of preparing high-quality Cu/Co nanoparticlesvia DC-Magnetron sputtering method on silicon substrates.
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Gold nanoparticles embedded in carbon film: Micromorphology analysis
S¸ tefan T¸a˘lu,Miroslaw Bramowicz,Slawomir Kulesza,Shahram Solaymani,Azizollah Shafikhani,Atefeh Ghaderi,Mohammad Ahmadirad 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
In this paper the sputtered gold nanoparticles (NPs) deposited by Radio Frequency-Plasma EnhancedChemical Vapor Deposition (RF-PECVD) method on the glass substrates in trace of amorphoushydrogenated carbon (Au NPs @ a-C: H) were analyzed to study the three-dimensional (3-D) surfacetexture. The prepared Au NPs @ a-C: H films were used as research materials. The synthesis of sampleswas carried out in different powers from 80 to 120 W while all other parameters were kept constant. TheX-ray diffraction patterns and UV–vis spectra were applied to study the structure and Localized SurfacePlasmon Resonance (LSPR), respectively. An atomic force microscope in a non-contact mode was usedto record the sample surface images then the fractal geometry was studied. The images were numericallyprocessed to calculate the Areal Autocorrelation Function (AACF), which was used to determine theanisotropy ratio Str, and to compute the Structure Function (SF). The log–log plots of the latter were usedto calculate fractal properties of the studied surfaces, such as fractal dimension D, and pseudo-topothesyK. The analysis of 3-D surface texture was helpful in optimizing the functional performance of thethin film.
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Stefan Talu,Miroslaw Bramowicz,Slawomir Kulesza,Atefeh Ghaderi,Hadi Savaloni,Reza Babaei,Shahram Solaymani 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
This study presents research into the three-dimensional (3-D) surface texture of silver chiralnanoflowers with three-, four- and five-folds spatial symmetry, which were produced using obliqueangle deposition method with rotating sample holder. X-ray diffraction (XRD), atomic force microscopy(AFM), and field-emission scanning electron microscopy (FESEM) measurements were carried out inorder to study 3-D morphology and structure of the samples at the nanoscale. Obtained results werefound to provide an insight into important relationships between the structure of prepared nanoflowersand their properties. Results presented in the paper proved the usefulness of the method for preparationof high-quality, sculptured 3-D nanostructures with pre-designed shapes (with narrower and longerpetals) and desired porosity. Specific structure, shape, and length scale of the 3-D deposits can be thenverified in simulations for quick characterization of the samples. This analysis helps to understand theirfunctional role in the test surface, in order to evaluate the relation among the 3-D microtextured surface.
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Naimeh Naseri,Ştefan Ţălu,Slawomir Kulesza,Shervin Qarechalloo,Amine Achour,Miroslaw Bramowicz,Atefeh Ghaderi,Shahram Solaymani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
To overcome recent energy and environment challenges, developing efficient and low cost photocatalystsare unavoidable. In this context, design of semiconductor nanostructures modified with earth abundantco-catalysts for water splitting reactions requires well engineered and controlled process to optimizesurface interface and maximize nanocomposite system efficiency. Here, TiO2 nanotube were synthesizedelectrochemically and decorated with cobalt based nanostructure co-catalyst for water oxidationreaction using low cost and scalable electro-deposition approach. By changing deposition parametersand complete studying on samples surface morphology and related statistical analysis data, correlationbetween all morphological parameters and photoelectrochamical activity of correspondence photo-anode was illustrated for thefirst time. Based on SEM analysis and surface analysis data as well ascatalytic performance investigation, nanotubes decorated with Co nanoparticles at 0.1 mA cm 2deposited for 2000 s presented the best performance with most isotropic surface. Results suggestedthat by tuning deposition parameters surface structural parameters like fractal dimension, cornerfrequency, roughness and feature shape and size can be engineered completely. Moreover, X-raydiffraction data along with Rietveld method revealed coexistence of anatase, rutile and Ti2O3 phases inthe photoanode while poor crystallinity of grown cobalt based nanostructures was confirmed.
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