Application of Fractal Geometry in Gas Sensor: A Review

Tian, Fengchun; Jiang, Anyan; Yang, Tie; Qian, Junhui; Liu, Ran; Jiang, Maogang

doi:10.1109/jsen.2021.3072621

Cited by 22 publications

(18 citation statements)

References 81 publications

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“…Many thin film surfaces, machined surfaces [2,[46][47][48], and other treated surfaces have been shown to have fractal properties. In the field of surface engineering, the surfaces have different degrees of fractal topography, which leads to different performance of the functional film [37,49]. In the field of thin films, different substrate surfaces and preparation methods lead to different fractal micro-structures.…”

Section: Mechanism and Techniques Of Thin Filmsmentioning

confidence: 99%

“…In terms of practical application, many of above-mentioned previous studies have linked fractal characteristics with the application properties of specific film surfaces, such as gas sensing characteristics [49], refractive properties [87], wettability [102], capacitance behavior [112], and resistivity performance [37]. Since the artificial surface of fractal structure can characterize rough surface profile [113], which is random but is also multi-scale and self-similar [25], it is also used in modeling research on the effect of surface topography on performance [114,115].…”

Section: Fractal For Surface Mechanism and Propertiesmentioning

confidence: 99%

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Fractal Analysis on Surface Topography of Thin Films: A Review

et al. 2022

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The topographies of various surfaces have been studied in many fields due to the significant influence that surfaces have on the practical performance of a given sample. A comprehensive evaluation requires the assistance of fractal analysis, which is of significant importance for modern science and technology. Due to the deep insights of fractal theory, fractal analysis on surface topographies has been widely applied and recommended. In this paper, the remarkable uprising in recent decades of fractal analysis on the surfaces of thin films, an essential domain of surface engineering, is reviewed. By summarizing the methods used to calculate fractal dimension and the deposition techniques of thin films, the results and trends of fractal analysis are associated with the microstructure, deposition parameters, etc. and this contributes profoundly to exploring the mechanism of film growth under different conditions. Choosing appropriate methods of surface characterization and calculation methods to study diverse surfaces is the main challenge of current research on thin film surface topography by using fractal theory. Prospective developing trends are proposed based on the data extraction and statistics of the published literature in this field.

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Section: Mechanism and Techniques Of Thin Filmsmentioning

confidence: 99%

Section: Fractal For Surface Mechanism and Propertiesmentioning

confidence: 99%

Fractal Analysis on Surface Topography of Thin Films: A Review

et al. 2022

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“…This similarity makes the surface area of fractal bodies much greater than that of traditional Euclidean shapes. Therefore, fractal theory provides an opportunity to develop new gas sensor structures, which in turn, could improve sensitivity [16].…”

Section: Introductionmentioning

confidence: 99%

Development of Gas Sensor Based on Fractal Substrate Structures

Jiang

Tian

Covington

et al. 2022

IEEE Trans. Instrum. Meas.

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“…1,9,36,37 Fractal objects have a higher surface area as compared to the substrates. 9,38,39 Many researchers have reported that the performance of a supercapacitor is enhanced with metal doping as well as the formation of nanocomposites. [9][10][11]36,40,41 Recently, our group reported a high specific capacity (∼413 C g −1 ), energy density (∼45.95 Wh kg −1 ), and power density (∼2.6 kW kg −1 ) in an Sr(OH) 2 -based supercapacitive electrode.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a fractal study of a Cu-doped Sr(OH) 2 thin film as a supercapacitive electrode reported that the supercapacitive value enhances with increase in fractal dimension . This suggests that surface engineering can be an efficient tool to adjust the surface area of electrodes with fractal porosity/granularity for further improvements in the performance of devices. , It is interesting to note that the electrode–electrolyte interface with fractal geometry offers an improved electrode–electrolyte interface. ,,, Fractal objects have a higher surface area as compared to the substrates. ,, …”

Section: Introductionmentioning

confidence: 99%

Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)₂ Thin Films: A Fractal Approach

Yadav

Priya

et al. 2021

J. Phys. Chem. C

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Fractal concepts have been employed to explore the morphological evolution of Sr(OH) 2 thin films prepared by the successive ionic layer adsorption and reaction (SILAR) method on stainless steel (SS) substrate. The surface morphology of each sample was captured using atomic force microscopy (AFM). Interface width, lateral correlation length, and roughness exponent were computed. Our study reveals that as doping is increased, the roughness exponent decreases and the fractal dimension increases. In all cases, the value of the roughness exponent was found to be greater than 0.5, indicating that the height fluctuations at neighboring pixels are correlated positively and exhibit persistent behavior and memory effect. Advanced fractal parameters such as lacunarity coefficient (σ), Hurst coefficient (HC), fractal succolarity (FS), and surface entropy (SE) are also calculated. Our study reveals that the surface entropy does not show any significant change, indicating a globally uniform surface. Furthermore, the local surface slope is found to play a crucial role in the performance of supercapacitive electrodes. Fractal analysis indicates that electrodes with larger fractal dimension are better for supercapacitor applications. These observations are corroborated with the 0.5 atom % Fe/Sr(OH) 2 doped sample. This sample exhibits both the highest fractal dimension and a specific capacity of 776 C g −1 at a scan rate of 5 mV s −1 . The materials with higher fractal dimension could thus be a strong candidate for the fabrication of highly efficient supercapacitors.

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Application of Fractal Geometry in Gas Sensor: A Review

Cited by 22 publications

References 81 publications

Fractal Analysis on Surface Topography of Thin Films: A Review

Fractal Analysis on Surface Topography of Thin Films: A Review

Development of Gas Sensor Based on Fractal Substrate Structures

Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)₂ Thin Films: A Fractal Approach

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Application of Fractal Geometry in Gas Sensor: A Review

Cited by 22 publications

References 81 publications

Fractal Analysis on Surface Topography of Thin Films: A Review

Fractal Analysis on Surface Topography of Thin Films: A Review

Development of Gas Sensor Based on Fractal Substrate Structures

Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)2 Thin Films: A Fractal Approach

Contact Info

Product

Resources

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Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)₂ Thin Films: A Fractal Approach