Investigation of Femtosecond Laser-Induced Periodic Surface Structure on Tungsten

Chen, 李晨 Li; Guanghua, 程光华 Cheng; Razvan, Stoian Razvan Stoian

doi:10.3788/aos201636.0532001

Cited by 4 publications

(2 citation statements)

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“…We use the genetic algorithm and DFT single point energy to search the existing adsorption sites on the surface of Ni (100). Most of the adsorption sites concentrate in the region of (3.5, 4.5) and (2,4). Only a few adsorption sites are discrete.…”

Section: Discussionmentioning

confidence: 99%

Optimal Adsorption Site of Periodical Metal Surface Based on Global Search of Genetic Algorithm

Zhang¹

2016

Proceedings of the 2016 4th International Conference on Electrical &Amp; Electronics Engineering and Computer Science (ICEEECS

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When using the chemical calculation method to study the adsorption, we should firstly find the preferential adsorption site of the catalyst surface. But at present, we often place the reactants in the typical adsorption sites, such as bridge position, vacancy and vertex position, to find the minimum energy point of the system according to the DFT structure optimization. The lack of study on atypical adsorption sites leads to the lack of other preferential adsorption sites. Therefore, we need to explore the potential adsorption sites on the periodic metal surfaces using global search method. The calculation operation of this paper involves the single point energy and structure optimization. The single point energy measures the size of the total energy of the system. The low the total energy of the system, the more stable adsorption is. The structural optimization is to change the structure to the most stable point by adjusting the coordinates of the atoms. In other words, the structural optimization is to find the most stable geometry. Structural optimization is used to calculate the configuration, which is the lowest energy structure and corresponds to the position of the optimal adsorption site. In addition, this paper also introduces the orbital analysis to verify the molecular structure of thiophene. We use the HOMO-LOMO Channel analysis to confirm whether there is π conjugate in thiophene. Conjugate is a criterion for judging whether thiophene molecules are dissociated or adsorbed. MethodWe choose the super unit cell model to study the adsorption of thiophene molecules on Ni (100) surface. The thiophene and the two layer of the metal top are allowed to relax.

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Section: Discussionmentioning

confidence: 99%

Optimal Adsorption Site of Periodical Metal Surface Based on Global Search of Genetic Algorithm

Zhang¹

2016

Proceedings of the 2016 4th International Conference on Electrical &Amp; Electronics Engineering and Computer Science (ICEEECS

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“…(2) Another fabrication mechanism of surface structure is mainly derived from the laser-induced effect. The theories for the generation of periodic fringe structure induced by ultrashort pulse laser include self-organization [104], plasma excitation [105], and second harmonic generation [106]. Electromagnetic field energy of the incident plan wave does not distribute evenly on thin, rough surfaces (note that the surface thickness is much smaller than the wavelength of the incident light).…”

Section: Interaction Between Femtosecond Laser and Solid Substratementioning

confidence: 99%

Bioinspired micro/nanostructured surfaces prepared by femtosecond laser direct writing for multi-functional applications

Zhang¹,

Jiao

et al. 2020

Int. J. Extrem. Manuf.

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Femtosecond laser direct writing (FLDW) has been widely employed in controllable manufacturing of biomimetic micro/nanostructures due to its specific advantages including high precision, simplicity, and compatibility for diverse materials in comparison with other methods (e.g. ion etching, sol-gel process, chemical vapor deposition, template method, and self-assembly). These biomimetic micro/nanostructured surfaces are of significant interest for academic and industrial research due to their wide range of potential applications, including self-cleaning surfaces, oil-water separation, and fog collection. This review presents the inherent relationship between natural organisms, fabrication methods, micro/nanostructures and their potential applications. Thereafter, we throw a list of current fabrication strategies so as to highlight the advantages of FLDW in manufacturing bioinspired microstructured surfaces. Subsequently, we summarize a variety of typical bioinspired designs (e.g. lotus leaf, pitcher plant, rice leaf, butterfly wings, etc) for diverse multifunctional micro/nanostructures through extreme femtosecond laser processing technology. Based on the principle of interfacial chemistry and geometrical optics, we discuss the potential applications of these functional micro/nanostructures and assess the underlying challenges and opportunities in the extreme fabrication of bioinspired micro/nanostructures by FLDW. This review concludes with a follow up and an outlook of femtosecond laser processing in biomimetic domains.

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A study of morphology of silicon with femtosecond laser based on phase field model

Zhang

et al. 2022

Mater. Res. Express

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In this paper, phase field model is employed to simulate the process of femtosecond laser which irradiates on silicon surface. The numerical model is mainly used to study the micro/nano evolution process and the atomic diffusion motion of the system. Meanwhile, the Semi-Implicit Fourier spectral method and Semi-Implicit Backwards Differentiation Formula are applied for high efficiency and numerical stability. Further, the rules of surface bumps are controlled by different thermal conductivities which are systematically revealed. Our work provides a new prospect for fabricating the bumps of the probe, to obtain high sensitivity sensors in chemical and biological fields.

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Investigation of Femtosecond Laser-Induced Periodic Surface Structure on Tungsten

Cited by 4 publications

References 0 publications

Optimal Adsorption Site of Periodical Metal Surface Based on Global Search of Genetic Algorithm

Optimal Adsorption Site of Periodical Metal Surface Based on Global Search of Genetic Algorithm

Bioinspired micro/nanostructured surfaces prepared by femtosecond laser direct writing for multi-functional applications

A study of morphology of silicon with femtosecond laser based on phase field model

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