Ultra-high ordered, centimeter scale preparation of microsphere Langmuir films

Kallepalli, L. N. Deepak; Constantinescu, Cătălin; Delaporte, Philippe; Utéza, O.; Grojo, David

doi:10.1016/j.jcis.2015.01.047

Cited by 12 publications

(5 citation statements)

References 53 publications

(75 reference statements)

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“…However, the preference lies in colloidal materials that: (1) can be synthesized with precise monodispersed particle sizes; (2) allow highly-selective etching (RIE) in step b) of Figure 2 ; and (3) can be easily removed by chemical lift-off in step d) [ 54 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. In view of that, the most synthesized particle materials for use in CL have been polystyrene (PS), polymethyl methacrylate (PMMA), and silica [ 65 ]. Good phase stability, together with a narrow colloidal size distribution (less than 5% for the typically employed microspheres), has been achieved by suspension [ 40 ], emulsion [ 66 ], and dispersion polymerization [ 64 , 67 ] synthesis techniques.…”

Section: Colloidal Lithography (Cl) Methodologiesmentioning

confidence: 99%

“…Still, using the simpler CL version with close-packed 2D colloidal crystals as etching masks, triangular nanoparticles [ 105 ], nanodots [ 106 ], and thin-films with nanohole arrays [ 107 ], nanotips [ 108 ], or nanopillars [ 109 ] have been fabricated on several substrates (such as polymer-based, silica, and silicon) [ 65 , 69 , 97 ].…”

Section: Colloidal Lithography (Cl) Methodologiesmentioning

confidence: 99%

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Colloidal Lithography for Photovoltaics: An Attractive Route for Light Management

et al. 2021

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The pursuit of ever-more efficient, reliable, and affordable solar cells has pushed the development of nano/micro-technological solutions capable of boosting photovoltaic (PV) performance without significantly increasing costs. One of the most relevant solutions is based on light management via photonic wavelength-sized structures, as these enable pronounced efficiency improvements by reducing reflection and by trapping the light inside the devices. Furthermore, optimized microstructured coatings allow self-cleaning functionality via effective water repulsion, which reduces the accumulation of dust and particles that cause shading. Nevertheless, when it comes to market deployment, nano/micro-patterning strategies can only find application in the PV industry if their integration does not require high additional costs or delays in high-throughput solar cell manufacturing. As such, colloidal lithography (CL) is considered the preferential structuring method for PV, as it is an inexpensive and highly scalable soft-patterning technique allowing nanoscopic precision over indefinitely large areas. Tuning specific parameters, such as the size of colloids, shape, monodispersity, and final arrangement, CL enables the production of various templates/masks for different purposes and applications. This review intends to compile several recent high-profile works on this subject and how they can influence the future of solar electricity.

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Section: Colloidal Lithography (Cl) Methodologiesmentioning

confidence: 99%

Section: Colloidal Lithography (Cl) Methodologiesmentioning

confidence: 99%

Colloidal Lithography for Photovoltaics: An Attractive Route for Light Management

et al. 2021

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“…On the basis of this classical process, the LB principle has been adapted for microsphere colloidal lithography. The role of the classical amphiphilic molecules is played by microspheres of polystyrene functionalized with a steric acid group, e.g., C18-triethoxy (octadecyl) silane [22]. Here, the colloidal lithography experiments are performed using P-spheres with diameters of 2 and 3 µm, commercially available at Microparticles GmbH ® and Micro Partikeltechnologie GmbH ® .…”

Section: Methodsmentioning

confidence: 99%

Vanadium Dioxide–Iridium Composite Development: Specific Near Infrared Surface Plasmon Resonance

et al. 2021

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This work serves as a roadmap for the development of a Vanadium dioxide (VO2)–Iridium composite based on the self-assembly of closely packed colloidal polystyrene microspheres (P-spheres) coupled with a Pulsed Laser Deposition (PLD) process. The self-assembly of a monolayer of PS is performed on an Al2O3-c substrate, using an adapted Langmuir–Blodgett (LB) process. Then, on the substrate covered with P-spheres, a 50-nanometer Iridium layer is deposited by PLD. The Iridium deposition is followed by the removal of PS with acetone, revealing an array of triangular shaped metallic elements formed on the underlaying substrate. In a last deposition step, 50-, 100- and 200-nanometer thin films of VO2 are deposited by PLD on top of the substrates covered with the Iridium quasi-triangles, forming a composite. Adapting the size of the P-spheres leads to control of both the size of the Iridium micro-triangle and, consequently, the optical transmittance of the composite. Owing to their shape and size the Iridium micro-triangles exhibit localized surface plasmon resonance (LSPR) characterized by a selective absorption of light. Due to the temperature dependent properties of VO2, the LSPR properties of the composite can be changeable and tunable.

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“…A key aspect, in common with so-called colloidal lithography, is the preparation of self-assembled arrays of spheres [113], that is a material science topic attracting special attention. In this context, the Langmuir-Blodgett technique is a widely applied method due to its ability to prepare large-scale high-quality self-assembled monolayers, provided that the spheres and/or the surface are appropriately functionalized [114]. Figure 6a shows, by atomic force microscopy (AFM), the hexagonal periodic arrangement of functionalized spheres (1 µm diameter) as obtained by this method.…”

Section: Microsphere-assisted Sub-diffraction Laser Processingmentioning

confidence: 99%

Short-Pulse Lasers: A Versatile Tool in Creating Novel Nano-/Micro-Structures and Compositional Analysis for Healthcare and Wellbeing Challenges

et al. 2021

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Driven by flexibility, precision, repeatability and eco-friendliness, laser-based technologies have attracted great interest to engineer or to analyze materials in various fields including energy, environment, biology and medicine. A major advantage of laser processing relies on the ability to directly structure matter at different scales and to prepare novel materials with unique physical and chemical properties. It is also a contact-free approach that makes it possible to work in inert or reactive liquid or gaseous environment. This leads today to a unique opportunity for designing, fabricating and even analyzing novel complex bio-systems. To illustrate this potential, in this paper, we gather our recent research on four types of laser-based methods relevant for nano-/micro-scale applications. First, we present and discuss pulsed laser ablation in liquid, exploited today for synthetizing ultraclean “bare” nanoparticles attractive for medicine and tissue engineering applications. Second, we discuss robust methods for rapid surface and bulk machining (subtractive manufacturing) at different scales by laser ablation. Among them, the microsphere-assisted laser surface engineering is detailed for its appropriateness to design structured substrates with hierarchically periodic patterns at nano-/micro-scale without chemical treatments. Third, we address the laser-induced forward transfer, a technology based on direct laser printing, to transfer and assemble a multitude of materials (additive structuring), including biological moiety without alteration of functionality. Finally, the fourth method is about chemical analysis: we present the potential of laser-induced breakdown spectroscopy, providing a unique tool for contact-free and space-resolved elemental analysis of organic materials. Overall, we present and discuss the prospect and complementarity of emerging reliable laser technologies, to address challenges in materials’ preparation relevant for the development of innovative multi-scale and multi-material platforms for bio-applications.

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Ultra-high ordered, centimeter scale preparation of microsphere Langmuir films

Cited by 12 publications

References 53 publications

Colloidal Lithography for Photovoltaics: An Attractive Route for Light Management

Colloidal Lithography for Photovoltaics: An Attractive Route for Light Management

Vanadium Dioxide–Iridium Composite Development: Specific Near Infrared Surface Plasmon Resonance

Short-Pulse Lasers: A Versatile Tool in Creating Novel Nano-/Micro-Structures and Compositional Analysis for Healthcare and Wellbeing Challenges

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