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RISS 인기검색어
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- 저자 : Ştefan Ţălu (검색결과 3 건)
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Multifractal Characterization of Water Soluble Copper Phthalocyanine Based Films Surfaces
Ştefan Ţălu,Sebastian Stach,Aman Mahajan,Dinesh Pathak,Tomas Wagner,Anshul Kumar,R. K. Bedi,Mihai Ţălu 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.4
This paper presents a multifractal approach to characterize the structural complexity of 3D surface roughness of CuTsPc films on the glass and quartz substrate, obtained with atomic force microscopy (AFM) analysis. CuTsPc films prepared by drop cast method were investigated. CuTsPc films surface roughness was studied by AFM in tapping-mode™, in an aqueous environment, on square areas of 100 μm2 and 2500 μm2. A detailed methodology for CuTsPc films surface multifractal characterization, which may be applied for AFM data, was also presented. Analysis of surface roughness revealed that CuTsPc films have a multifractal geometry at various magnifications. The generalized dimension Dq and the singularity spectrum f(α) provided quantitative values that characterize the local scale properties of CuTsPc films surface morphology at nanometer scale. Multifractal analysis provides different yet complementary information to that offered by traditional surface statistical parameters.
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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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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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