Hyperuniform Monocrystalline Structures by Spinodal Solid-State Dewetting

Salvalaglio, Marco; Bouabdellaoui, Mohammed; Bollani, Monica; Benali, Abdennacer; Favre, Luc; Claude, Jean-Benoît; Wenger, Jérôme; Anna, Pietro de; Intonti, Francesca; Voigt, Axel; Abbarchi, Marco

doi:10.1103/physrevlett.125.126101

Cited by 32 publications

(33 citation statements)

References 63 publications

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“…Thus, we can extrapolate an S(k = 0) ~ 0.15 which is not far from typical values found for spontaneous dHU patterns [48][49][50] . From this analysis it emerges an effective hyperuniform character of the masters in use as expected for these kinds of patterns 30 and from the analysis of the spectral density measured from large atomic force microscopy images in similar samples 9 .…”

Section: Disordered Hyperuniformity Of Metal Oxide Structuresmentioning

confidence: 93%

“…separated islands, connected structures), the process can be done at temperature ranging between 400 to 800°C and time from 30 minutes to 6 hours. Examples of the final morphologies of dewetted structures used as hard masters for nano-imprint lithography are provided in Figure 5 9 .…”

Section: Experimental Section Master Preparationmentioning

confidence: 99%

“…We first characterize the BRDF of a SiGe-based master obtained by spinodal solid-state dewetting of 150 nm of Si0.7Ge0.3 on ultra-thin silicon on insulator 9 (Figure 2). The far-field scattering of the laser shined at normal incidence (exc = 0 degrees) at the center of the sample (where the morphology of the dewetted structures displays disconnected islands, Figure 6 a, d and f), shows an intense peak at k// = 0 m -1 (det = 0 degrees), a sharp decrease and two symmetric lobes at about k// ~ ±3.4 m -1 .…”

Section: Disordered Hyperuniformity Of Metal Oxide Structuresmentioning

confidence: 99%

“…Finally, study the effect of the initial sol-gel layer thickness on the quality of the metal oxide replicas and show its influence on the properties of our dHU metasurfaces as anti-reflection coatings on silicon. The hard masters used in this work were elaborated by a self-assembly method based on solid state dewetting of ultra-thin silicon films on insulator (UT-SOI) and SiGe (or Ge) deposition via molecular beam epitaxy (Figure 1a) 9,34 . The UT-SOI substrates used here were commercial monocrystalline Si films, 14 nm thick, (001)-oriented on 25 nm thick buried oxide on a Si (001) substrate.…”

Section: Introductionmentioning

confidence: 99%

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Scalable Disordered Hyperuniform Architectures via Nanoimprint Lithography of Metal Oxides

Chehadi

Bouabdellaoui

Modaresialam

et al. 2021

ACS Appl. Mater. Interfaces

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Fabrication and scaling of disordered hyperuniform materials remain hampered by the difficulties in controlling the spontaneous phenomena leading to this novel kind of exotic arrangement of objects. Here we demonstrate a hybrid top-down/bottom-up approach based on sol-gel dip-coating and nano-imprint lithography for the faithful reproduction of disordered hyperuniform metasurfaces in metal oxides. Nano-to micro-structures made of silica and titania can be directly printed over several cm 2 on glass and on silicon substrates. First, we describe the polymer mold fabrication starting from a hard master obtained via spontaneous solid-state dewetting of SiGe and Ge thin layers on SiO2. Then we assess the effective disordered hyperuniform character of master and replica and the role of the thickness of the sol-gel layer on the metal oxide replicas and on the presence of a residual layer underneath. Finally, as a potential application, we show the antireflective character of titania structures on silicon. Our results are relevant for the realistic implementation over large scales of disordered hyperuniform nano-and micro-architectures made of metal oxides thus opening their exploitation in the framework of wet chemical assembly.

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Section: Disordered Hyperuniformity Of Metal Oxide Structuresmentioning

confidence: 93%

Section: Experimental Section Master Preparationmentioning

confidence: 99%

Section: Disordered Hyperuniformity Of Metal Oxide Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scalable Disordered Hyperuniform Architectures via Nanoimprint Lithography of Metal Oxides

Chehadi

Bouabdellaoui

Modaresialam

et al. 2021

ACS Appl. Mater. Interfaces

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“…See, for example, the discussion in Backofen et al 25 . In fact, several simulations for realistic applications in materials science consider this model—see, for example, other studies 26‐38 —and claim that their large‐scale simulations would not be feasible without the additional degeneracy. The drawback of this DDCH model, which is termed RRV model in several publications, 22,31,36 is that it is nonvariational.…”

Section: Introductionmentioning

confidence: 99%

Doubly degenerate diffuse interface models of anisotropic surface diffusion

Salvalaglio

Selch

Voigt

et al. 2020

Math Methods in App Sciences

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We extend the doubly degenerate Cahn–Hilliard (DDCH) models for isotropic surface diffusion, which yield more accurate approximations than classical degenerate Cahn–Hilliard (DCH) models, to the anisotropic case. We consider both weak and strong anisotropies and demonstrate the capabilities of the approach for these cases numerically. The proposed model provides a variational and energy dissipative approach for anisotropic surface diffusion, enabling large‐scale simulations with material‐specific parameters.

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Electric Field Driven Reversible Spinodal Dewetting of Thin Liquid Films on Slippery Surfaces

Bhatt

Gupta

Sumathi

et al. 2023

Adv Materials Inter

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The stability of thin liquid films on a surface depends on the excess free energy of the system involving various short‐range and long‐range interactions. When forced to wet an unfavorable surface, thin liquid films dewet into multiple small‐sized droplets via spinodal, homogeneous, or heterogeneous nucleation process. However, if the total excess free energy of the system can be manipulated using external stimuli, for example, electric field, temperature, or light, one can control the stability of thin liquid films on demand. Here the electric‐field induced reversible dewetting and rewetting of thin liquid films underneath aqueous drops on slippery surfaces is studied. Upon applying voltage, hundreds of nanometer thick stable liquid films dewet in a manner identical to the spinodal dewetting of few nanometer‐thick liquid films following the linear stability analysis. Upon removing the applied voltage, the dewetted droplets spread, coalesce with neighboring ones, and form a uniform film again, albeit taking significantly longer times. The characteristic features defined via spatial and temporal evolution of the dewetting and rewetting processes are present over multiple cycles suggesting the complete reversibility of the process.

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Hyperuniform Monocrystalline Structures by Spinodal Solid-State Dewetting

Cited by 32 publications

References 63 publications

Scalable Disordered Hyperuniform Architectures via Nanoimprint Lithography of Metal Oxides

Scalable Disordered Hyperuniform Architectures via Nanoimprint Lithography of Metal Oxides

Doubly degenerate diffuse interface models of anisotropic surface diffusion

Electric Field Driven Reversible Spinodal Dewetting of Thin Liquid Films on Slippery Surfaces

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