Multiscale structured germanium nanoripples as templates for bioactive surfaces

Dell’Anna, Rossana; Masciullo, Cecilia; Iacob, Erica; Barozzi, M.; Giubertoni, D.; Böttger, Roman; Cecchini, Marco; Pepponi, G.

doi:10.1039/c6ra28531g

Cited by 12 publications

(15 citation statements)

References 41 publications

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“…After having fabricated the PFPE intermediate molds as previously described, we performed thermal NIL to transfer the nanostructures on Cyclic Olefin Copolymer (COC) foils. The process parameters were previously optimized for this copolymer as follows: T imprint = 150 °C (T COC g = 134 °C, t = 300 s, P = 50 bar, T cool-down = 80 °C) [ 18 , 19 , 20 ]. The characteristic of low surface energy of PFPE also helped in this case, thus facilitating the final detachment of the imprinted plastics.…”

Section: Resultsmentioning

confidence: 99%

“…PFPE resin (FLUOROLINK ® MD 700, Solvay Speciality Polymers, Bollate, Italy) was mixed with 3% w / w photoinitiator Darocure 1173 (C 10 H 12 O 2 , 405655 Sigma Aldrich, Milano, Italy), poured on top of the PMMA surfaces, and crosslinked by UV-light (365 nm, 25 mW·cm −2 ). The exposure was performed in two steps, which was reported in References [ 18 , 19 ]. Briefly, the samples were kept for 180 s in nitrogen atmosphere and then were kept for 60 s in air.…”

Section: Methodsmentioning

confidence: 99%

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Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

et al. 2018

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Among soft lithography techniques, Thermal Nanoimprint Lithography (NIL) is a high-throughput and low-cost process that can be applied to a broad range of thermoplastic materials. By simply applying the appropriate pressure and temperature combination, it is possible to transfer a pattern from a mold surface to the chosen material. Usually, high-resolution and large-area NIL molds are difficult to fabricate and expensive. Furthermore, they are typically made of silicon or other hard materials such as nickel or quartz for preserving their functionality. Nonetheless, after a large number of imprinting cycles, they undergo degradation and become unusable. In this paper, we introduce and characterize an innovative two-step NIL process based on the use of a perfluoropolyether (PFPE) intermediate mold to replicate sub-100 nm features from a silicon mold to the final thermoplastic material. We compare PFPE elastomeric molds with molds made of the standard polydimethylsiloxane (PDMS) elastomer, which demonstrates better resolution and fidelity of the replica process. By using PFPE intermediate molds, the nanostructured masters are preserved and the throughput of the process is significantly enhanced.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

et al. 2018

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“…For periodic nanopatterns, the x ‐projection gives the corresponding wave‐vector direction and l represents the ripple wavelength λ . To measure the average difference between peak heights and valley depths of the ripples, called mean roughness depth R z , the maximum vertical distances D l between the highest and lowest data points within one correlation length and for all the possible lengths l contained in a single x ‐line scan were calculated and summed to provide the final R z average value (more details about this calculation can be found in Dell'Anna et al ., 2017). The D l histograms were computed together with the corresponding probability distribution function (PDF), calculated with a Gaussian kernel density estimation by Scott's method (Scott, 1992).…”

Section: Methodsmentioning

confidence: 99%

“…The use of nanorippled surfaces as periodic templates for thin‐film (Fassbender et al ., 2009) and nanoparticle deposition (Ranjan & Stefan Facsko, 2012) is particularly promising to tailor specific magnetic or optical properties through the introduction of a spatial anisotropy. Recently, it has been shown that highly regular ion‐induced nanorippled surfaces can be transferred onto biocompatible polymeric substrates (Dell'Anna et al ., 2017) and used in a neural cell adhesion and spatial organization study (Masciullo et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

AFM and Raman study of graphene deposited on silicon surfaces nanostructured by ion beam irradiation

Dell’Anna

Iacob

Dalton

et al. 2020

Journal of Microscopy

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Nanoscale structures were produced on silicon surfaces by low-energy oxygen ion irradiation: periodic rippled or terraced patterns formed spontaneously, depending on the chosen combination of beam incidence angle and ion fluence. Atomic force microscopy image processing and analysis accurately described the obtained nanotopographies. Graphene monolayers grown by chemical vapour deposition were transferred onto the nanostructured silicon surfaces. The interfacial interaction between the textured surface and the deposited graphene governs the conformation of the thin carbon layer; the resulting different degree of regularity and conformality of the substrate-induced graphene corrugations was studied and it was related to the distinctive topographical features of the silicon nanostructures. Raman spectroscopy revealed specific features of the strain caused by the alternating suspension and contact with the underlying nanostructures and the consequent modulation of the silicon-graphene interaction.

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“…Two strategies have been reported so far. Dell'Anna et al employed thermal nanoimprinting lithography via an intermediate mold [105]. This intermediate mold was fabricated by UV crosslinking of a perfluoropolyether (PFPE) resin on a nanorippled Ge surface with about 300 nm periodicity.…”

Section: Pattern Transfermentioning

confidence: 99%

Ion Beam Nanopatterning of Biomaterial Surfaces

Yang

Keller

2021

Applied Sciences

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Ion beam irradiation of solid surfaces may result in the self-organized formation of well-defined topographic nanopatterns. Depending on the irradiation conditions and the material properties, isotropic or anisotropic patterns of differently shaped features may be obtained. Most intriguingly, the periodicities of these patterns can be adjusted in the range between less than twenty and several hundred nanometers, which covers the dimensions of many cellular and extracellular features. However, even though ion beam nanopatterning has been studied for several decades and is nowadays widely employed in the fabrication of functional surfaces, it has found its way into the biomaterials field only recently. This review provides a brief overview of the basics of ion beam nanopatterning, emphasizes aspects of particular relevance for biomaterials applications, and summarizes a number of recent studies that investigated the effects of such nanopatterned surfaces on the adsorption of biomolecules and the response of adhering cells. Finally, promising future directions and potential translational challenges are identified.

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Multiscale structured germanium nanoripples as templates for bioactive surfaces

Abstract: A novel two-step transfer process, that produces by nanoimprinting lithography biocompatible polymeric nanowired ripples, starting from germanium surfaces nanopatterned by irradiating gold ions.

Cited by 12 publications

References 41 publications

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

AFM and Raman study of graphene deposited on silicon surfaces nanostructured by ion beam irradiation

Ion Beam Nanopatterning of Biomaterial Surfaces

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