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Pandey RK, Yadav RP, Kumar T, Kumar A, Pathak S, Awasthi S, Singh UB, Pandey AC. Fractal characterizations of MeV ion treated CaF 2 thin films. CHAOS (WOODBURY, N.Y.) 2023; 33:033110. [PMID: 37003822 DOI: 10.1063/5.0135127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 02/13/2023] [Indexed: 06/19/2023]
Abstract
We present the morphological evolution and fractal characterizations of CaF2 thin-film surfaces modified by bombardment with 100 MeV Au+8 ions at various fluences. Atomic force microscopy (AFM) combined with line profile and two-dimensional power spectral density (2D-PSD) analysis was utilized to investigate the evolution of surface morphology as a function of fluence. The AFM images were utilized to investigate the relationship between fractal dimension, roughness exponent, lateral correlation length, and ion fluence. The surface erosion owing to sputtering was depicted using Rutherford backscattering spectrometry. The structural characteristics' dependency on fluence was explored with the help of glancing angle x-ray diffraction measurements on virgin and irradiated samples. Tensile stress calculated using a peak shift in the glancing angle x-ray diffractogram showed an increase in tensile stress with fluence that caused the surface to crack after the fracture strength of the surface was crossed. 2D-PSD analysis signified the role of sputtering over surface diffusion for the observed surface modifications. Fractal dimensions first increased and then decreased with ion fluence. The lateral correlation length decreased, while the roughness exponent increased with fluence after the threshold value.
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Affiliation(s)
- Ratnesh K Pandey
- Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Dehradun 248007, Uttarakhand, India
| | - Ram Pratap Yadav
- Department of Physics, Deen Dayal Upadhyay Govt. P.G. College, Saidabad, Allahabad 221508, India
| | - Tanuj Kumar
- Department of Nanosciences and Materials, Central University of Jammu, Rahya-Suchani, Bagla 181143, Jammu, India
| | - Ashish Kumar
- Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Dehradun 248007, Uttarakhand, India
| | - Sachin Pathak
- Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Dehradun 248007, Uttarakhand, India
| | - Shikha Awasthi
- Department of Physics, MM Mahila Mahavidyalaya, Ara 802301, India
| | - Udai B Singh
- Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, 273009 Gorakhpur, India
| | - Avinash C Pandey
- Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
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Boron-Doped Diamond/GaN Heterojunction-The Influence of the Low-Temperature Deposition. MATERIALS 2021; 14:ma14216328. [PMID: 34771852 PMCID: PMC8585340 DOI: 10.3390/ma14216328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/12/2021] [Accepted: 10/19/2021] [Indexed: 11/23/2022]
Abstract
We report a method of growing a boron-doped diamond film by plasma-assisted chemical vapour deposition utilizing a pre-treatment of GaN substrate to give a high density of nucleation. CVD diamond was deposited on GaN substrate grown epitaxially via the molecular-beam epitaxy process. To obtain a continuous diamond film with the presence of well-developed grains, the GaN substrates are exposed to hydrogen plasma prior to deposition. The diamond/GaN heterojunction was deposited in methane ratio, chamber pressure, temperature, and microwave power at 1%, 50 Torr, 500 °C, and 1100 W, respectively. Two samples with different doping were prepared 2000 ppm and 7000 [B/C] in the gas phase. SEM and AFM analyses revealed the presence of well-developed grains with an average size of 100 nm. The epitaxial GaN substrate-induced preferential formation of (111)-facetted diamond was revealed by AFM and XRD. After the deposition process, the signal of the GaN substrate is still visible in Raman spectroscopy (showing three main GaN bands located at 565, 640 and 735 cm−1) as well as in typical XRD patterns. Analysis of the current–voltage characteristics as a function of temperature yielded activation energy equal to 93.8 meV.
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JAHANGIRI ALIREZA, RAJABI KALVANI PAYAM, SHAPOURI SAMANEH, SARI AMIRHOSSEIN, ŢĂLU ŞTEFAN, JALILI YOUSEFSEYED. Quantitative SEM characterisation of ceramic target prior and after magnetron sputtering: a case study of aluminium zinc oxide. J Microsc 2021; 281:190-201. [PMID: 32926411 PMCID: PMC7891359 DOI: 10.1111/jmi.12961] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 08/08/2020] [Accepted: 09/03/2020] [Indexed: 02/05/2023]
Abstract
Till now electron microscopy techniques have not been used to evaluate the plasma-target interactions undergone during the magnetron sputtering process. The destructive nature of this interaction severely alters the target microstructure. Utilising quantitative microscopy techniques can shed light on the complex plasma and solid-state processes involved which can ultimately lead to improved functional thin film deposition. As a representative functional material, aluminium-doped-zinc oxide (AZO) is an upcoming alternative to conventional transparent electrode wherein the process optimisation is of great importance. In this paper, we evaluate the pre- and post-sputter field emission scanning electron microscopy (FESEM) data for ceramic AZO target fabricated at three final sintering temperatures (1100°C, 1200°C and 1300°C). In all cases, grain boundaries are merged in addition to a visible reduction in the secondary phases which makes segmentation-based image analysis challenging. Through surface statistics (i.e. fractal dimension, autocorrelation length, texture aspect ratio and entropy) as a function of magnification we can quantify the electron microscopy image of the microstructure. We show that the plasma-microstructure interaction leads to an increase in autocorrelation length, texture aspect ratio and entropy for the optimum AZO ceramic sputtering target sintered at 1200°C. Furthermore, a maximum reduction in fractal dimension span (as determined by exponential regression) is also observed for 1200°C. In addition to the evaluation of plasma effects on sintering, our approach can provide a window towards understanding the underlying thin film growth mechanisms. We believe that this technique can be applied to the defect characterisation of a wide range of polycrystalline ceramic sputtering targets (e.g. ITO, CZTS, GAZO and so on) with the ultimate goal of improving the magnetron sputtering process and the resulting functional thin film. LAY DESCRIPTION: Magnetron sputtering allows scientists to make functional thin films on the order of the nanoscale. In this technique, atoms are plucked from a 'target' then placed onto a substrate forming a thin nanometric film: all thanks to magnets, a special power supply and the fourth state of matter (plasma). Understanding what is going on and how to make a 'good' thin film is important for making better light emitting diodes, solar cells and light sensors. Scientists use electron microscopy to see what is going on in the microstructure of the sputtered thin films to fine tune the sputtering recipe. Here, for the first time, we have applied electron microscopy to see the surface of the microstructure before and after magnetron sputtering. This will help us understanding the plasma-microstructure interaction allowing us to make more informed decisions when fine-tuning the sputtering process to get improved thin films. This is a case study of aluminium-doped zinc oxide (AZO) target that could potentially replace indium tin oxide (ITO), which is widely used as a transparent electrode in devices involving light and electricity. In this case, improved characteristics would be lower electrical resistivity and higher transmission of light. We show that it is possible to use a mathematical description (e.g. the fractal dimension) of the scanning electron microscopy picture to show a link between the target surface and the functional properties. Simple explanation of fractal dimensions by Sixty Symbols ○ https://www.youtube.com/watch?v=cmBljeC79Ls Experimental demonstration of magnetron sputtering by The Thought Emporium ○ https://www.youtube.com/watch?v=Cyu7etM-0Ko Introductory video on magnetron sputtering by Applied Science ○ https://www.youtube.com/watch?v=9OEz_e9C4KM Demonstration of AZO target fabrication and sputtering by Pradhyut Rajjkumar ○ https://www.youtube.com/watch?v=kTLaTJfNX3c Simple explanation of a DIY SEM by Applied Science ○ https://www.youtube.com/watch?v=VdjYVF4a6iU.
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Affiliation(s)
- ALI REZA JAHANGIRI
- NanoLundLund UniversityBox 118, 22100LundSweden
- Department of Physics, Faculty of Science, Science and Research BranchIslamic Azad UniversityTehranIran
- Plasma Physics Research Centre, Science and Research BranchIslamic Azad UniversityTehranIran
- Nano‐Optoelectronics Laboratory, Sheykh Bahaee Research Complex, Science and Research BranchIslamic Azad UniversityTehranIran
| | - PAYAM RAJABI KALVANI
- Department of Physics, Faculty of Science, Science and Research BranchIslamic Azad UniversityTehranIran
- Plasma Physics Research Centre, Science and Research BranchIslamic Azad UniversityTehranIran
- Nano‐Optoelectronics Laboratory, Sheykh Bahaee Research Complex, Science and Research BranchIslamic Azad UniversityTehranIran
| | - SAMANEH SHAPOURI
- Department of Physics, Faculty of Science, Science and Research BranchIslamic Azad UniversityTehranIran
- Plasma Physics Research Centre, Science and Research BranchIslamic Azad UniversityTehranIran
- Nano‐Optoelectronics Laboratory, Sheykh Bahaee Research Complex, Science and Research BranchIslamic Azad UniversityTehranIran
| | - AMIRHOSSEIN SARI
- Department of Physics, Faculty of Science, Science and Research BranchIslamic Azad UniversityTehranIran
- Plasma Physics Research Centre, Science and Research BranchIslamic Azad UniversityTehranIran
| | - ŞTEFAN ŢĂLU
- The Directorate of Research, Development and Innovation Management (DMCDI)Technical University of Cluj‐NapocaCluj‐NapocaClujRomania
| | - YOUSEF SEYED JALILI
- Department of Physics, Faculty of Science, Science and Research BranchIslamic Azad UniversityTehranIran
- Plasma Physics Research Centre, Science and Research BranchIslamic Azad UniversityTehranIran
- Nano‐Optoelectronics Laboratory, Sheykh Bahaee Research Complex, Science and Research BranchIslamic Azad UniversityTehranIran
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Yadav RP, Baranwal V, Kumar S, Pandey AC, Mittal AK. Multifractal analysis of SiO2 surface embedded with Ge nanocrystal. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01626-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Solaymani S, Ţălu Ş, Nezafat NB, Rezaee S, Kenari MF. Diamond nanocrystal thin films: Case study on surface texture and power spectral density properties. AIP ADVANCES 2020. [DOI: 10.1063/5.0003866] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Shahram Solaymani
- Department of Physics, Harsin Branch, Islamic Azad University, 6731994934 Harsin, Iran
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Constantin Daicoviciu St., No. 15, Cluj-Napoca 400020, Cluj County, Romania
| | - Negin Beryani Nezafat
- School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
| | - Sahar Rezaee
- Department of Physics, Kermanshah Branch, Islamic Azad University, 6718997551 Kermanshah, Iran
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Abstract
Abstract
The purpose of this work is the study of the correlation between the thickness of tantalum pentoxide thin films and their three-dimensional (3D) micromorphology. The samples were prepared on silicon substrates by electron beam evaporation. The differences in surface structure of the processed and reference samples were investigated. Compositional studies were performed by energy-dispersive X-ray spectroscopy. Stereometric analysis was carried out on the basis of atomic force microscopy (AFM) data, for tantalum pentoxide samples with 20 nm, 40 nm, 60 nm, 80 nm and 100 nm thicknesses. These methods are frequently used in describing experimental data of surface nanomorphology of Ta2O5. The results can be used to validate theoretical models for prediction or correlation of nanotexture surface parameters.
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Stach S, Ţălu Ş, Dallaev R, Arman A, Sobola D, Salerno M. Evaluation of the Topographical Surface Changes of Silicon Wafers after Annealing and Plasma Cleaning. SILICON 2019. [DOI: 10.1007/s12633-019-00351-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ţălu Ş, Stach S, Lainović T, Blažić L. Characterization of spatial patterns of dental restorative nanocomposites. Microsc Res Tech 2019; 82:1215-1223. [PMID: 30938008 DOI: 10.1002/jemt.23270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 03/04/2019] [Accepted: 03/14/2019] [Indexed: 02/05/2023]
Abstract
The aim of this study was to provide important insights into the effects of four different dental polishing protocols (one single-step and one multi-step either followed or not by diamond paste polishing) on the 3D surface morphology of two representative dental resin-based nanocomposites (a nanofilled and a nanohybrid composite) by means of digital image analysis and processing techniques. The 3D surface morphology was investigated by atomic force microscopy. Segmentation, statistics of height distributions (described by statistical parameters, according to ISO 25178-2: 2012) and Minkowski functionals were applied to the images to characterize the spatial patterns of analyzed samples at micrometer scale. The nanofilled composite had significantly lower values of height parameters in comparison with nanohybrid one. Multi-step polishing protocol generated a statistically significant smoother finish for both tested materials, than one-step polishing protocol, even when it was followed by diamond paste polishing. Diamond paste polishing generated a statistically significant smoother surface of tested samples. This suite of surface analysis tools is important in the research and manufacture of these dental resin-based nanocomposites, where material surfaces have a key role in the functionality of objects.
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Affiliation(s)
- Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Romania
| | - Sebastian Stach
- Department of Biomedical Computer Systems, Institute of Informatics, Faculty of Computer Science and Materials Science, University of Silesia, Sosnowiec, Poland
| | - Tijana Lainović
- School of Dentistry, Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
| | - Larisa Blažić
- School of Dentistry, Faculty of Medicine, Department of Restorative Dentistry and Endodontics, Clinic of Dentistry of Vojvodina, University of Novi Sad, Novi Sad, Serbia
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Dejam L, Solaymani S, Achour A, Stach S, Ţălu Ş, Nezafat NB, Dalouji V, Shokri AA, Ghaderi A. Correlation between surface topography, optical band gaps and crystalline properties of engineered AZO and CAZO thin films. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.042] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Rashid D, Stach S, Ţălu Ş, Sobola D, Méndez-Albores A, Córdova GT, Grmela L. Stereometric Analysis of Effects of Heat Stressing on Micromorphology of Si Single Crystals. SILICON 2019. [DOI: 10.1007/s12633-019-0085-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ţălu Ş, Morozov IA, Sobola D, Škarvada P. Multifractal Characterization of Butterfly Wings Scales. Bull Math Biol 2018; 80:2856-2870. [PMID: 30194522 DOI: 10.1007/s11538-018-0490-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 08/24/2018] [Indexed: 02/07/2023]
Abstract
A lot of insect families have physical structures created by evolution for coloration. These structures are a source of ideas for new bio-inspired materials. The aim of this study was to quantitatively characterize the micromorphology of butterfly wings scales using atomic force microscopy and multifractal analysis. Two types of butterflies, Euploea mulciber ("striped blue crow") and Morpho didius ("giant blue morpho"), were studied. The three-dimensional (3D) surface texture of the butterfly wings scales was investigated focusing on two areas: where the perceived colors strongly depend on and where they do not depend on the viewing angle. The results highlight a correlation between the surface coloration and 3D surface microtexture of butterfly wings scales.
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Affiliation(s)
- Ştefan Ţălu
- The Technical University of Cluj-Napoca, The Directorate of Research, Development and Innovation Management (DMCDI), Constantin Daicoviciu Street, No. 15, 400020, Cluj-Napoca, Cluj County, Romania
| | - Ilya A Morozov
- Institute of Continuous Media Mechanics UB RAS, 1 Korolev St., Perm, Russia, 614013
| | - Dinara Sobola
- Faculty of Electrical Engineering and Communication, Physics Department, Brno University of Technology, Technická 8, 616 00, Brno, Czech Republic.
| | - Pavel Škarvada
- Faculty of Electrical Engineering and Communication, Physics Department, Brno University of Technology, Technická 8, 616 00, Brno, Czech Republic
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Ţălu Ş, Yadav RP, Šik O, Sobola D, Dallaev R, Solaymani S, Man O. How topographical surface parameters are correlated with CdTe monocrystal surface oxidation. MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING 2018. [DOI: 10.1016/j.mssp.2018.05.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ţălu Ş, Yadav RP, Lainović T, Méndez-Albores A, Trejo G, Kukuruzović D, Nezafat NB, Shafiekhani A, Solaymani S. The effect of dental LED light-curing unit photoactivation mode on 3D surface morphology of dental nanocomposites evaluated by two-dimensional multifractal detrended fluctuation analysis. Microsc Res Tech 2018; 81:1223-1230. [PMID: 30351526 DOI: 10.1002/jemt.23123] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 08/04/2018] [Accepted: 08/07/2018] [Indexed: 02/05/2023]
Abstract
The objective of this study was to evaluate the effect of two photoactivation modes of dental LED light-curing unit (LCUs) (conventional and "Soft Start" mode) on surface texture parameters of two dental resin-based nanocomposites. LED LCUs were considered as standard light-curing devices in contemporary dental practice. Atomic force microscopy (AFM) was applied to investigate surface morphology on 90 × 90 μm2 scanning area through 2D multifractal detrended fluctuation analysis with computational algorithms basis. In order to compare 3D surface roughness at nanometer scale, singularity spectrum f[α] was used which characterize local scale properties of multifractal nature of samples. The results confirmed that larger spectrum width Δα (Δα = αmax - αmin ) of f(α) is associated with non-uniform surface morphology. Moreover, materials whose polymerization was photoactivated by the "soft start" polymerization mode, showed better quality of the surface microstructure with lower values of AFM surface texture parameters.
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Affiliation(s)
- Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Cluj County, Romania
| | | | - Tijana Lainović
- Faculty of Medicine, School of Dentistry, University of Novi Sad, Novi Sad, Serbia
| | - Alia Méndez-Albores
- Institute of Sciences-ICUAP Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria Puebla, Puebla, Mexico
| | - Gabriel Trejo
- Center of Research and Technological Development in Electrochemistry (CIDETEQ), Parque Tecnológico Sanfandila, Querétaro, Mexico
| | | | - Negin Beryani Nezafat
- Young Researchers and Elite Club, West Tehran Branch, Islamic Azad University, Tehran, Iran
| | | | - Shahram Solaymani
- Young Researchers and Elite Club, West Tehran Branch, Islamic Azad University, Tehran, Iran
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Zare M, Solaymani S, Shafiekhani A, Kulesza S, Ţălu Ş, Bramowicz M. Evolution of rough-surface geometry and crystalline structures of aligned TiO 2 nanotubes for photoelectrochemical water splitting. Sci Rep 2018; 8:10870. [PMID: 30022150 PMCID: PMC6052034 DOI: 10.1038/s41598-018-29247-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 07/09/2018] [Indexed: 02/07/2023] Open
Abstract
Nowadays, increasing awareness of environment and fossil fuels protection stimulates intensive research on clean and renewable sources of energy. Production of hydrogen from water through solar-driven splitting reactions is one of the most promising approaches in the field of photoelectrochemistry (PEC). In this work we have fabricated well-aligned, highly-ordered, smooth-mouth TiO2 nanotube arrays (TNAs) in a two-step anodization process of titanium foil, which were then used as photoelectrodes for PEC water splitting. It demonstrates for the first time correspondence between non-linear component characteristics of multiscale rough surface and crystalline structure of annealed TNAs measured at various fabrication stages and their photoelectrochemical response. The as-anodized TNAs with isotropic surface (deduced from AFM and SEM images) and largest figure of merit (according to their PEC performance) were annealed at 450 °C in air. Scale-invariant descriptors of the surface structure of the deposits involved: fractal dimension, corner frequency, roughness, size of nanostructures and their dominant habits. Moreover, X-ray diffraction data processed using the Rietveld method confirmed co-existence of various oxides, for example: TiO2 in the form of anatase, TiO and Ti3O5 phases in the TNAs under study pointing that previous well-established mechanisms of the TNA growth were to certain degree incomplete.
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Affiliation(s)
- Maryam Zare
- School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
| | - Shahram Solaymani
- Young Researchers and Elite Club, West Tehran Branch, Islamic Azad University, Tehran, Iran.
| | - Azizollah Shafiekhani
- School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
- Physics Department, Alzahra University, Tehran, 1993891167, Iran
| | - Slawomir Kulesza
- University of Warmia and Mazury in Olsztyn, Faculty of Mathematics and Computer Science, Sloneczna 54, 10-710, Olsztyn, Poland
| | - Ştefan Ţălu
- Technical University of Cluj-Napoca, The Directorate of Research, Development and Innovation Management (DMCDI), Constantin Daicoviciu St., no. 15, Cluj-Napoca, 400020, Cluj county, Romania
| | - Miroslaw Bramowicz
- University of Warmia and Mazury in Olsztyn, Faculty of Technical Sciences, Oczapowskiego 11, 10-719, Olsztyn, Poland
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Naseri N, Ţălu Ş, Kulesza S, Qarechalloo S, Achour A, Bramowicz M, Ghaderi A, Solaymani S. How morphological surface parameters are correlated with electrocatalytic performance of cobalt-based nanostructures. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.08.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ghaderi A, Solaymani S, Dalouji V. Second comment on: “The effect of pressure on morphological features and quality of synthesized graphene” [Res Chem Intermed DOI 10.1007/s11164-016-2594-8]. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-017-2958-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ţălu Ş, Nikola P, Sobola D, Achour A, Solaymani S. Micromorphology investigation of GaAs solar cells: case study on statistical surface roughness parameters. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2017. [DOI: 10.1007/s10854-017-7422-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Influence of annealing process on surface micromorphology of carbon–nickel composite thin films. OPTICAL AND QUANTUM ELECTRONICS 2017. [DOI: 10.1007/s11082-017-1040-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Solaymani S, Ghaderi A, Kulesza S, Bramowicz M. Comment on: ‘‘The effect of pressure on morphological features and quality of synthesized graphene’’ [Res Chem Intermed journal DOI 10.1007/s11164-016-2594-8]. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-016-2758-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Kumar M, Javid A, Han JG. Surface Energy in Nanocrystalline Carbon Thin Films: Effect of Size Dependence and Atmospheric Exposure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2514-2522. [PMID: 28206768 DOI: 10.1021/acs.langmuir.6b04463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surface energy (SE) is the most sensitive and fundamental parameter for governing the interfacial interactions in nanoscale carbon materials. However, on account of the complexities involved of hybridization states and surface bonds, achieved SE values are often less in comparison with their theoretical counterparts and strongly influenced by stability aspects. Here, an advanced facing-target pulsed dc unbalanced magnetron-sputtering process is presented for the synthesis of undoped and H/N-doped nanocrystalline carbon thin films. The time-dependent surface properties of the undoped and H/N-doped nanocrystalline carbon thin films are systematically studied. The advanced plasma process induced the dominant deposition of high-energy neutral carbon species, consequently controlling the intercolumnar spacing of nanodomain morphology and surface anisotropy of electron density. As a result, significantly higher SE values (maximum = 79.24 mJ/m2) are achieved, with a possible window of 79.24-66.5 mJ/m2 by controlling the experimental conditions. The intrinsic (size effects and functionality) and extrinsic factors (atmospheric exposure) are resolved and explained on the basis of size-dependent cohesive energy model and long-range van der Waals interactions between hydrocarbon molecules and the carbon surface. The findings anticipate the enhanced functionality of nanocrystalline carbon thin films in terms of selectivity, sensitivity, and stability.
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Affiliation(s)
- Manish Kumar
- Center for Advanced Plasma Surface Technology (CAPST), NU-SKKU Joint Institute for Plasma-Nano Materials (IPNM), Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 440-746, Republic of Korea
| | - Amjed Javid
- Center for Advanced Plasma Surface Technology (CAPST), NU-SKKU Joint Institute for Plasma-Nano Materials (IPNM), Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 440-746, Republic of Korea
- Department of Textile Processing, National Textile University , Faisalabad 37610, Pakistan
| | - Jeon Geon Han
- Center for Advanced Plasma Surface Technology (CAPST), NU-SKKU Joint Institute for Plasma-Nano Materials (IPNM), Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 440-746, Republic of Korea
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Naseri N, Solaymani S, Ghaderi A, Bramowicz M, Kulesza S, Ţălu Ş, Pourreza M, Ghasemi S. Microstructure, morphology and electrochemical properties of Co nanoflake water oxidation electrocatalyst at micro- and nanoscale. RSC Adv 2017. [DOI: 10.1039/c6ra28795f] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Nowadays, fossil fuel limitations and environmental concerns push researchers to find clean and renewable energy resources.
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Affiliation(s)
- Naimeh Naseri
- Department of Physics
- Sharif University of Technology
- Tehran 11155-9161
- Iran
| | - Shahram Solaymani
- Department of Physics
- Science and Research Branch
- Islamic Azad University
- Tehran
- Iran
| | - Atefeh Ghaderi
- Department of Physics
- West Tehran Branch
- Islamic Azad University
- Tehran
- Iran
| | - Miroslaw Bramowicz
- University of Warmia and Mazury in Olsztyn
- Faculty of Technical Sciences
- 10-719 Olsztyn
- Poland
| | - Slawomir Kulesza
- University of Warmia and Mazury in Olsztyn
- Faculty of Mathematics and Computer Science
- 10-710 Olsztyn
- Poland
| | - Ştefan Ţălu
- Technical University of Cluj-Napoca
- Faculty of Mechanical Engineering
- Department of AET
- Discipline of Descriptive Geometry and Engineering Graphics
- Cluj-Napoca 400641
| | - Mohammad Pourreza
- Department of Physics
- Sharif University of Technology
- Tehran 11155-9161
- Iran
| | - Shahnaz Ghasemi
- Water and Energy Research Center
- Sharif University of Technology
- Tehran 11155-9161
- Iran
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