Multifractal and optical bandgap characterization of Ta2O5 thin films deposited by electron gun method

Shakoury, Reza; Rezaee, Sahar; Mwema, Fredrick Madaraka; Luna, Carlos; Ghosh, Koushik; Jurečka, Stanislav; Ţălu, Ștefan; Arman, Ali; Korpi, Alireza Grayeli

doi:10.1007/s11082-019-2173-5

Cited by 54 publications

(27 citation statements)

References 43 publications

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“…extract affects the statistical parameters of the surface of kefir biofilms. The study of surface parameters by the AFM technique provides several important aspects of biofilms, such as roughness, volume, peak distribution, height distribution, and texture homogeneity (Astinchap, 2019; Arman et al, 2015; Ansari et al, 2017; Yadav et al, 2017; Shakoury et al, 2020; Jing & Tang, 2016). This research reports the first discussion of statistical parameters and possible applications related to the surface of kefir biofilms prepared with the extract from Maytenus rigida Mart.…”

Section: Introductionmentioning

confidence: 99%

Stereometric characterization of kefir microbial films associated with Maytenus rigida extract

Matos

Pinto

Ramos

et al. 2020

Microscopy Res & Technique

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The aim of this study was to report the first discussion of statistical parameters and possible applications related to the surface of kefir biofilms prepared with Maytenus rigida Mart. extract through micromorphology, using atomic force microscopy (AFM). Four different samples were produced. The reference contained demerara sugar with a concentration of 40 g/L and the others had added extract whose concentrations were 0.25, 0.50, and 0.75 g/L, respectively. AFM was used to image the surface in tapping mode, on square areas of 30 μm × 30 μm. Images were studied by the MountainsMap premium commercial software. The main parameter of the surface, roughness, grew with the increase of the extract concentration up to 0.50 g/L. In addition, asymmetry and kurtosis showed that the biofilm with the best peak distribution was the one with 0.25 g/L of plant extract. The other parameters followed the main results for the surface and were observed for the depth and volume parameters. The power spectrum density spectrum confirmed the reliability of the results for the sample with 0.25 g/L. Therefore, the sample with 0.25 g/L of plant extract produced the best balance in relation to the surface properties. These results showed that the biofilm morphology and microtexture were affected by the incorporation of the plant extract and can be useful to define possible applications.

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Section: Introductionmentioning

confidence: 99%

Stereometric characterization of kefir microbial films associated with Maytenus rigida extract

Matos

Pinto

Ramos

et al. 2020

Microscopy Res & Technique

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“…It is important to mention that multiferroic materials contribute to the development of new scientific methods [20]. In addition, topographical maps obtained by AFM allow us to access several parameters, such as stereometric [21][22][23], fractal [24][25][26][27], multifractal [28][29][30], and power spectrum density (PSD) [23,31,32], which are very useful for characterization of surfaces at micro-or nanoscale. For this reason, exploring the nanoscale morphology of LuMnO 3 thin films can provide reliable answers about the effect of sintering temperature on the formation of its topography.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Stereometric and Fractal Patterns of Spin‐Coated LuMnO₃ Thin Films

Marques

Matos

Romaguera-Barcelay

et al. 2021

Advances in Materials Science and Engineering

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In this paper, we have performed qualitative and quantitative analysis of LuMnO3 thin films surfaces, deposited by spin coating over Pt(111)/TiO2/SiO2/Si substrates, to evaluate their spatial patterns as a function of the film’s sintering temperature. Atomic force microscopy was employed to obtain topographic maps that were extensively analyzed via image processing techniques and mathematical tools. 3D (three-dimensional) topographical images revealed that films sintered at 650°C and 750°C presented the formation of smoother surfaces, while the film sintered at 850°C displayed a rougher surface with a root mean square roughness of ∼2.5 nm. On the other direction, the height distribution of the surface for all films has similar asymmetries and shape, although the film sintered using the highest temperature showed the lower density of rough peaks and a sharper peak shape. The advanced fractal parameters revealed that the film sintered at 850°C is dominated by low spatial frequencies, showing less spatial complexity, higher microtexture homogeneity, and uniform height distribution. These results suggest that the combination of stereometric and fractal parameters can be especially useful for identification of unique topographic spatial patterns in LuMnO3 thin films, helping in their implementation in technological applications, such as photovoltaic solar cells and information magnetic date storage and spintronic devices.

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“…AFM has been an important tool for analyzing biological surfaces (e.g., Gonçalves et al, 2017; Sobola et al, 2017; Zaneta et al, 2017; Matos et al, 2018; Almeida et al, 2019; Ferraro et al, 2020). The most relevant aspects of topographical features and fractal parameters have been reported using this technique (e.g., Arman et al, 2015; Ţəlu et al, 2015; Jing & Tang, 2016; Ţălu et al, 2016 b , 2018; Ansari et al, 2017; Yadav et al, 2017; Astinchap, 2019; Shakoury et al, 2020). The characterization of plant leaf morphology by AFM has already been reported in the literature (Ramos et al, 2016; Salcedo et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Advanced Microtexture Study of Anacardium occidentale L. Leaf Surface From the Amazon by Fractal Theory

2020

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This work applies stereometric parameters and fractal theory to characterize the structural complexity of the 3D surface roughness of Anacardium occidentale L. leaf using atomic force microscopy (AFM) measurements. Surface roughness was studied by AFM in tapping mode, in air, on square areas of 6,400 and 10,000 μm2. The stereometric analyses using MountainsMap Premium and WSXM software provided detailed information on the 3D surface topography of the samples. These data showed that the morphology of the abaxial and adaxial side of the cashew leaf is different, which was also observed in relation to their microtextures. Fractal analysis showed that the adaxial and abaxial sides have strong microtexture homogeneity, but the adaxial side presented higher surface entropy. These results show that image processing associated with fractal theory can be an indispensable tool for identifying plant species by their leaves because this species has singularities on each side of the leaf.

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Multifractal and optical bandgap characterization of Ta2O5 thin films deposited by electron gun method

Cited by 54 publications

References 43 publications

Stereometric characterization of kefir microbial films associated with Maytenus rigida extract

Stereometric characterization of kefir microbial films associated with Maytenus rigida extract

Investigation of Stereometric and Fractal Patterns of Spin‐Coated LuMnO₃ Thin Films

Advanced Microtexture Study of Anacardium occidentale L. Leaf Surface From the Amazon by Fractal Theory

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Multifractal and optical bandgap characterization of Ta2O5 thin films deposited by electron gun method

Cited by 54 publications

References 43 publications

Stereometric characterization of kefir microbial films associated with Maytenus rigida extract

Stereometric characterization of kefir microbial films associated with Maytenus rigida extract

Investigation of Stereometric and Fractal Patterns of Spin‐Coated LuMnO3 Thin Films

Advanced Microtexture Study of Anacardium occidentale L. Leaf Surface From the Amazon by Fractal Theory

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Investigation of Stereometric and Fractal Patterns of Spin‐Coated LuMnO₃ Thin Films