Bio-inspired iridescent layer-by-layer assembled cellulose nanocrystal Bragg stacks

Tzeng, Ping; Hewson, D.; Vukusic, Peter; Eichhorn, Stephen J.; Grunlan, Jaime C.

doi:10.1039/c5tc00590f

Cited by 18 publications

(20 citation statements)

References 46 publications

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“…From the fabrication point of view, polymer DBRs are interesting thanks to the variety of techniques available both at the laboratory and at the industrial scale. At the lab scale they are fabricated via spin‐coating (Figure a),[7b,33e,68a,84] dip‐coating (Figure d),[28e] layer‐by‐layer deposition, and by the self‐assembling of block copolymers (BCPs, Figure ) . The latter is arising interest thanks to the possibility to couple polymers pairs otherwise not processable together .…”

Section: Materials and Fabrication Techniquesmentioning

confidence: 99%

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

179

226

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photonic states (PDOS), [2][3][4] which helps explaining the photoluminescence (PL) changes of materials when embedded in the PhC structure.Traditionally, PhCs have been made carving bulky inorganic dielectrics or sem iconductors. These structures are still a hot topic in photonics for optical fibers, light emitting diodes (LEDs), sensors, photo voltaic devices, lasers, discrete and integrated optical components, lightening, and quantum computing. [6] However, new solution processable photoactive materials (e.g., organic semiconductors, quantum dots, hybrid perovskites, and selfassem bling supramolecular systems) stimulated the development of PhCs grown with organic and colloidal materials by solution and melt processes. [7] Among PhCs, distributed Bragg reflectors (DBRs) are cur rently the most interesting owing to their planar structure which generates a simple optical response that represents a playground to understand deep physical concepts, as described in Sections 2.4 and 4. DBRs are indeed made of alternated thin films of different dielectric materials. This simplicity makes them the only PhCs that can take advantage of large area growths (see Section 3.1). [8] Such fabrication methods are unconceivable with bulky inorganic DBRs and might reduce processing costs and enhance customizability, also on industrial scale, thus adding unprecedented market opportunities. Figure 1 illustrates the evolution and fabrications of solution and melt processed DBRs. The top of the Figure displays three wellknown natural DBRs belonging to animal and plant reigns: the mother of pearl, [9] the Panamanian Tortoise beetle exoskel eton, [10] and the Pollia Condensata skin, [11] whose growth is driven by the thermodynamics of spinodal phase separation. [12] The interest in these natural structures leads to their emulation until the development of solutionbased fabrication methods for flexible synthetic DBRs made of polymers and inorganic nanoparticles (Figure 1). At the base of Figure 1, we also show some applications arose only in the last decades. From left to right: the use of DBRs in functional architecture, in enhance ment of photon absorption for photovoltaic cells and modules, emission control, lasing, and sensing. [7c,13] In this paper we will first briefly review the properties of DBRs and then focus on the reasons that guided the research toward new solutionbased and largearea fabrications, describing current processes used both at the laboratory and largearea scales. We will then review the main applications of these structures comparing the performances of mesoporous inorganic and polymer devices. An overview on the properties and applications of polymer and inorganic planar 1D photonic crystals fabricated from solution is provided here. In the last decades, photonic crystals became technologically relevant for light management, photovoltaics, sensing, and lasing. Such structures are traditionally produced by lithographic and vacuum techniques, but the need to reduce costs and to scale-up the fabrication have lea...

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Section: Materials and Fabrication Techniquesmentioning

confidence: 99%

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

179

226

View full text Add to dashboard Cite

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“…Absorption of light in a given wavelength range leads to a macroscopic color; for example, by electronic excitations in dyes or plasmonic resonances in noble metal nanoparticles. [16] The combination of structural coloration and absorption can improve the color saturation of materials by reducing the amount of nonspecific background scattering in the structure. Examples of structural coloration abound in natural species, [13] and can also be found in synthetic photonic structures such as diffraction gratings, [7,14] colloidal crystals, [15] and multilayer stacks.…”

mentioning

confidence: 99%

The Optical Janus Effect: Asymmetric Structural Color Reflection Materials

et al. 2017

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Structurally colored materials are often used for their resistance to photobleaching and their complex viewing-direction-dependent optical properties. Frequently, absorption has been added to these types of materials in order to improve the color saturation by mitigating the effects of nonspecific scattering that is present in most samples due to imperfect manufacturing procedures. The combination of absorbing elements and structural coloration often yields emergent optical properties. Here, a new hybrid architecture is introduced that leads to an interesting, highly directional optical effect. By localizing absorption in a thin layer within a transparent, structurally colored multilayer material, an optical Janus effect is created, wherein the observed reflected color is different on one side of the sample than on the other. A systematic characterization of the optical properties of these structures as a function of their geometry and composition is performed. The experimental studies are coupled with a theoretical analysis that enables a precise, rational design of various optical Janus structures with highly controlled color, pattern, and fabrication approaches. These asymmetrically colored materials will open applications in art, architecture, semitransparent solar cells, and security features in anticounterfeiting materials.

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“…a) Schematic images of neon tera fish, seashell, and C. rajah beetle . ( In clockwise sequence, the same hereinafter ) b) Schematic images of Asian Arowana fish, fly compound eyes, and fish gill .…”

Section: Introductionmentioning

confidence: 99%

“…c) Schematic images of plant leaf, Electrophorus electricus , and honeycomb . d) Photonic applications of incidence angle, incidence wavelength, and iridescence by magnetic actuation . e) Wettable applications of spilled oil collection, superhydrophobic surface, anti‐fogging coating and contact angle .…”

Section: Introductionmentioning

confidence: 99%

Bioinspired 2D Nanomaterials for Sustainable Applications

et al. 2019

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opens new doors for innovation in materials and sustainable technologies. Owing to the great diversity and complexity of nature, the well-evolved natural structures corresponding to specific functionalities may vary from 1D nanofibers or nanoneedles to 2D nanosheets or nanoplates or even 3D multiscale-ordered structures. [32] A good understanding of the structureproperty relationships is essential for the design and fabrication of bioinspired nanomaterials.2D nanomaterials have achieved some significant triumphs in various applications, benefitting from their unique structural characteristics and relevant chemical and physical properties. [33][34][35] In fact, 2D nanostructures also widely exist in nature and generate some amazing functionalities, which offers us great opportunities to further expand the design and fabrication of 2D nanostructured materials, devices, and technologies. [36] By integrating 2D nanomaterials with the bioinspired strategies, innovative materials and technologies have been proposed and realized. In this research news, recent progress that mainly achieved over the past decade in bioinspired materials and technologies based on 2D nanomaterials for targeted sustainable energy and environmental technologies, such as energy conversion and storages, environmental remediation, etc., is reviewed and discussed. As shown in Figure 1, three topical subjects, including bioinspired 2D photonic structures, bioinspired 2D energy nanomaterials, and bioinspired 2D superwetting materials, along with the challenges and opportunities will be the focus of this article, and give an overall perspective to this emerging and promising research area. Bioinspired 2D Photonic MaterialsTo survive in the wild world, natural species have evolved various unique structures with fascinating optical functionalities, such as glitzy structural colors for attracting prey or mates, [37] tunable camouflage colors for escaping from predators, [38] antireflection function of compound eyes for weak light vision, [36] and so on. These structures, as known as photonic crystal structures, have inspired the design of novel photonic micro/nanostructures and some smart optical devices.Among the various natural photonic structures, one class consists of periodically stacked 2D multilayers, also known as Bragg Stacks, have been found in many natural organisms, such as plants, insects, and marine benthos. [39] Multiple pairs of 2D layers with different refractive indexes in Bragg Stacks can generate iridescent structural colors through constructive The increasing demand for constructing ecological civilization and promoting socially sustainable development has encouraged scientists to develop bioinspired materials with required properties and functions. By bringing science and nature together, plenty of novel materials with extraordinary properties can be created by learning the best from natural species. In combination with the exceptional features of 2D nanomaterials, bioinspired 2D nanomaterials and technologies have delivered signif...

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Bio-inspired iridescent layer-by-layer assembled cellulose nanocrystal Bragg stacks

Cited by 18 publications

References 46 publications

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Advances in Functional Solution Processed Planar 1D Photonic Crystals

The Optical Janus Effect: Asymmetric Structural Color Reflection Materials

Bioinspired 2D Nanomaterials for Sustainable Applications

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