Silver nanopillar coatings grown by glancing angle magnetron sputtering for reducing multipactor effect in spacecrafts

Troncoso, G.; García-Martín, José Miguel; González, María Ujué; Morales, Carlos; Castro, Marcial Fernández; Soler-Morala, J.; Galán, L.; Soriano, L.

doi:10.1016/j.apsusc.2020.146699

Cited by 6 publications

(6 citation statements)

References 31 publications

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“…Since the mask selects a portion of the sputtered atoms that leave the target at a given angle, the incorporation of thermalized and partially thermalized species is minimized. Consequently, fewer atoms reach the substrate [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…Finally, physical screens, like the mask shown in Figure 1 c,d, inhibit the deposition of low-energy atoms that may arrive at the substrate from random directions, consequently selecting a subset of the incoming atomic flux. In other words, the mask acts as an additional particle collimator [ 37 , 38 ]. We used a mask made of molybdenum with the following dimensions: 4 mm height, 15 mm width, and 19 mm length; thus, covering the whole substrate area.…”

Section: Methodsmentioning

confidence: 99%

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Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

et al. 2022

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Ferromagnetic films down to thicknesses of tens of nanometers and composed by polycrystalline Fe and Fe2O3 nanopillars are grown in large areas by glancing angle deposition with magnetron sputtering (MS-GLAD). The morphological features of these films strongly depend on the growth conditions. Vertical or tilted nanopillars have been fabricated depending on whether the substrate is kept rotating azimuthally during deposition or not, respectively. The magnetic properties of these nanopillars films, such as hysteresis loops squareness, adjustable switching fields, magnetic anisotropy and coercivity, can be tuned with the specific morphology. In particular, the growth performed through a collimator mask mounted onto a not rotating azimuthally substrate produces almost isolated well-defined tilted nanopillars that exhibit a magnetic hardening. The first-order reversal curves diagrams and micromagnetic simulations revealed that a growth-induced uniaxial anisotropy, associated with an anisotropic surface morphology produced by the glancing angle deposition in the direction perpendicular to the atomic flux, plays an important role in the observed magnetic signatures. These results demonstrate the potential of the MS-GLAD method to fabricate nanostructured films in large area with tailored structural and magnetic properties for technological applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

et al. 2022

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“…With the aid of well-developed techniques, nanopillar microstructures similar to those of natural animals and plants can be prepared from different materials, such as silicon, silver, zinc oxide, titanium oxide, gallium nitride, polymers, and other materials. , In some reports, researchers have shown that these nanopillar microstructures have good potential in antibacterial uses and have presented many speculations about sterilization mechanisms of nanopillar microstructures. ,, …”

Section: Introductionmentioning

confidence: 99%

“…For instance, the micro−nano protrusion structures on the surface of a lotus leaf provide superhydrophobicity that can inhibit bacterial adhesion, 16,17 and the protruding microstructures on the surface of the wings of a cicada can puncture the cell membranes of bacteria and kill them. 18−20 With the aid of well-developed techniques, nanopillar microstructures similar to those of natural animals and plants can be prepared from different materials, such as silicon, 21 silver, 22 zinc oxide, 23 titanium oxide, 24 gallium nitride, 25 polymers, 26 and other materials. 27,28 In some reports, researchers have shown that these nanopillar microstructures have good potential in antibacterial uses and have presented many speculations about sterilization mechanisms of nanopillar microstructures.…”

Section: ■ Introductionmentioning

confidence: 99%

Normal Force-Induced Highly Efficient Mechanical Sterilization of GaN Nanopillars

Chen

Wang

et al. 2022

Langmuir

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Bacterial residue is one of the main causes of diseases and economic losses. In recent years, microfabrication technology has inspired the introduction of microstructures on the surfaces of relevant materials to provide antibacterial effects. This antibacterial method has become a popular research topic due to its safety, effectiveness, and stability. However, its exact mechanism is still under debate. In this study, normal force was introduced to bacteria on GaN nanopillars to investigate the mechanical sterilization effects and a computer simulation was conducted. The results show that the normal force induces highly efficient mechanical sterilization of the nanopillars, and their surfaces impede the attachment of bacteria. This study provides insights into the antibacterial effect of nanopillars and offers a potential antibacterial tool with high efficiency.

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“…[20] In particular, glancing angle deposition with magnetron sputtering (MS-GLAD) is a powerful technique for producing nanostructured coatings in large areas and with a great variety of morphologies. [21][22][23] In this work, we have followed our recent protocol to fabricate TiO 2 nanocolumn arrays in two steps: growth of Ti nanocolumns (NCs) by MS-GLAD and subsequent thermal oxidation to transform them into TiO 2 . [24] In addition, further modification of TiO 2 photoinduced properties can be achieved by creating a semiconductor-metal interface by means of metal nanoparticle decoration, which provides the system with enhanced charge separation and can modify the surface chemistry, representing a powerful method to tune the characteristics of photoactive surfaces.…”

Section: Introductionmentioning

confidence: 99%

Photo‐Induced Self‐Cleaning and Wettability in TiO₂ Nanocolumn Arrays Obtained by Glancing‐Angle Deposition with Sputtering

Fresno

González

Martínez

et al. 2021

Advanced Sustainable Systems

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In this work, the preparation of regular nanosized columnar structures of titanium dioxide by means of glancing angle deposition with magnetron sputtering (MS‐GLAD) followed by thermal annealing is reported. MS‐GLAD gives rise to metallic titanium columnar structures with regular width and length that after thermal treatment are fully oxidized to form TiO2 nanocolumns that maintain the morphological features of the original metallic ones. Further functionalization with gold by means of multiple ion cluster source results in well‐dispersed Au nanoparticles across the nanocolumns’ surface with a narrow size distribution centered at ca. 8.5 nm. The obtained nanostructures show photocatalytic self‐cleaning activity as shown by the elimination of an organic layer deposited on their surface and the detection of hydroxyl radicals. Photoelectrochemical measurements show a better charge separation at the Au/TiO2 interface. In addition, wettability studies show that the degree of hydrophobicity of the surface is increased by the presence of nanocolumns, both in the dark and under UV illumination. This behavior is not modified by the presence of Au nanoparticles on the surface. The obtained results open up interesting implications in the tunability of the properties of nanostructured thin films for this kind of photo‐activated application.

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Silver nanopillar coatings grown by glancing angle magnetron sputtering for reducing multipactor effect in spacecrafts

Cited by 6 publications

References 31 publications

Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

Normal Force-Induced Highly Efficient Mechanical Sterilization of GaN Nanopillars

Photo‐Induced Self‐Cleaning and Wettability in TiO₂ Nanocolumn Arrays Obtained by Glancing‐Angle Deposition with Sputtering

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Silver nanopillar coatings grown by glancing angle magnetron sputtering for reducing multipactor effect in spacecrafts

Cited by 6 publications

References 31 publications

Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

Normal Force-Induced Highly Efficient Mechanical Sterilization of GaN Nanopillars

Photo‐Induced Self‐Cleaning and Wettability in TiO2 Nanocolumn Arrays Obtained by Glancing‐Angle Deposition with Sputtering

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Photo‐Induced Self‐Cleaning and Wettability in TiO₂ Nanocolumn Arrays Obtained by Glancing‐Angle Deposition with Sputtering