Bioinspired stimuli-responsive multilayer film made of silk–titanate nanocomposites

Colusso, Elena; Perotto, Giovanni; Wang, Yushu; Sturaro, Marco; Omenetto, Fiorenzo G.; Martucci, Alessandro

doi:10.1039/c7tc00149e

Cited by 50 publications

(43 citation statements)

References 45 publications

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“…In this sense, lacking permeability dense bulky inorganic DBRs are not suitable for sensing, but they can be used to confine the light and achieve surface sensors (vide infra, Bloch surface waves). Conversely, polymer an porous PhCs based on silk, cellulose and cellulose derivatives, block‐copolymers, diffraction gratings, opals, inverse opals,[160b,163] molecularly imprinted polymer opal‐like structures,[160b,163g,164] colloidal crystals, porous inorganic and hybrid[53d,167] DBRs, are highly sensitive to both liquid and gas analytes, and offer low detection limits and high sensitivity.…”

Section: Applicationsmentioning

confidence: 99%

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

168

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: Applicationsmentioning

confidence: 99%

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

168

226

View full text Add to dashboard Cite

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“…3 and Table 1. 40,41,[55][56][57][58][59]65,67,71,72 However, an even larger, rapidly growing library of 2D materials exists, which holds promise for a yet more diverse and powerful set of sensing properties that can be harnessed in the future. 42,44,[73][74][75][76][77][78] The variety of nanosheets used for achieving structural colors range from antimony phosphates, 41,56,72 layered double hydroxides 59,79 to layered silicates such as clays, 40,50,66,80 and the architectures include thin films, 1D and 3D PCs, besides liquid crystals ( Fig.…”

Section: D Materials For Structural Colorationmentioning

confidence: 99%

“…The most common stimulus that is sensed with such architectures is humidity. 41,50,55,56,58,71,72 The first example of reversible humidity sensing by a photonic architecture based on 2D materials dates back to the 1990s, where LAPONITE® thin films were assembled by the sequential deposition of nanosheets from colloidal suspensions. 50 This was followed later with graphene oxide thin films (Fig.…”

Section: D Materials For Structural Colorationmentioning

confidence: 99%

Photonic nanoarchitectonics with stimuli-responsive 2D materials

Ganter

Lotsch

2019

Mol. Syst. Des. Eng.

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The ability to produce structural color from inherently colorless materials, similar to that in butterfly wings and beetle shells, has attracted considerable research interest over the last three decades. Despite their extraordinary properties and performances, the field of structural colors based on inherently functional 2D materials only took off recently. In this minireview, we highlight the diversity of 2D materials utilized for achieving structural coloration in different architectures. We summarize the large tunability of photonic architectures based on 2D materials and emphasize their extraordinary dynamic response induced by external stimuli. Subsequently, recent strategies to tailor their properties with molecular and structural approaches are discussed. Finally, we point out promising future directions in this emerging field. Structural coloroverview and concepts 566 | Mol. Syst. Des. Eng., 2019, 4, 566-579 This journal is Design, System, ApplicationAs 2D materials are coming of age, their richness in composition, structure and properties offer a unique platform for the design of tailor-made nanoscale building blocks for functional devices. Combining the chemical scope, diverse optical properties and stimuli-responsive nature of 2D materials and their ensembles with the recent advancement in liquid-assisted assembly strategies, 2D materials have emerged as versatile building blocks in thin film-based photonic architectures, including Fabry-Pérot interference filters and 1D photonic crystals. To impart such architectures with maximum functionality, design strategies range from molecular level approaches such as ion exchange and intercalation, to morphology engineering such as porosity tuning. The integration of 2D materials into photonic architectures has opened up new horizons in the realization of smart devices, ranging from vapor and pressure sensors to functional surfaces allowing for the touchless tracking of finger motions. On a more fundamental level, thin films exhibiting tunable structural color allow for the observation of otherwise optically silent processes with the naked eye, such as intercalation into 2D materials. Cast into photonic architectures, the unique versatility of 2D materials and their molecularly engineered counterparts can be harvested to push the limits of label-free sensing, anticounterfeiting, radiation shielding, photovoltaics, display technology, and beyond.

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“…Silk Fibroin Extraction : Silk fibroin solution (SF) were extracted from the raw fibers of Bombyx mori as previously reported . Silk cocoons were first cut in small pieces and then boiled in 0.02 m sodium carbonate solution for 30 min (Sigma‐Aldrich).…”

Section: Methodsmentioning

confidence: 99%

“…These nanoparticles have been investigated for the fabrication of thin films for optoelectronic applications and in combination with a polymeric matrix for the generation of proton exchange membranes . TNSs were combined with silk fibroin (SF) for the fabrication of nanocomposite thin films and membranes with tunable optical properties and processability at the micro and nanoscale range . Silk fibroin showed to be an excellent material for the development of biocompatible optical devices and sensors, thanks to its exceptional mechanical and optical properties, associated with biocompatibility and biodegradability.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of Titanates–Silk Nanocomposites via Cation Exchange for Optical Applications

Colusso

Vitiello

Perotto

et al. 2018

Adv Materials Inter

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A wide number of organic and inor ganic materials presents cation exchange properties, such as proteins and poly saccharides, phenolic, acrylic and poly styrene divinyl resins, zeolites, and layered metal oxides. [5,6] Layered titanates are titanium oxide based compounds, with a unique struc ture composed of a 2D host with a guest cation. They have been largely investi gated because of their exchange capacity for application in adsorption of heavy metal ions from water, generation of proton exchange membrane fuel cells or for the synthesis of complex metal oxide structures. [2,[7][8][9] In particular, titanate nanosheets (TNSs) are 2D crystals with a layered nanostructure of [Ti n O 2n+1 ] 2− composition and very small dimension (oneunitcell thickness and 2-6 nm in length). They present good cation exchange properties at the nanoscale because of their high surfacetovolume ratio, the high concentration of hydroxylic groups, and the interlayer distance adaptability. [10][11][12] These nanoparticles have been investigated for the fabrica tion of thin films for optoelectronic applications [13,14] and in combination with a polymeric matrix for the generation of proton exchange membranes. [15] TNSs were combined with silk fibroin (SF) for the fabrication of nanocomposite thin films and membranes with tunable optical properties and processability at the micro and nanoscale range. [16,17] Silk fibroin showed to be an excellent material for the development of biocom patible optical devices and sensors, thanks to its exceptional mechanical and optical properties, associated with biocompat ibility and biodegradability. Many studies have been made on the development of optical and photonic applications based on silk, as microlenses, waveguides, diffraction grating, and inverse opals. [18][19][20][21][22] Recently, researchers have used proteins in combination with 2D nanomaterials (e.g., graphene, dielectric nanosheets, and MXenes) for the generation of nanostructures composites with engineered properties. [23][24][25] These hybrids materials combine the advantages of the biopolymeric matrix, such as biocompatibility and mechanical robustness, with the unique electronic and optical properties of the 2D fillers. In addition, proteins can provide a precise control on the assembly of the material, thanks to the physical and chemical interac tions established with the 2D material. For example, molecular A simple and efficient method is developed to introduce plasmonic and luminescence functionalities in titanate nanosheets (TNSs)-silk nano composites by direct cation-exchange process. First, the cation exchange properties such as exchange kinetic and capacity are studied to verify the behavior of the material and determine the best condition of exchange. In particular, the effect of the valence on the kinetic is investigated through elemental analysis, focusing on three target cations (Ag + , Cu 2+ , and Eu 3+ ) in water. It is demonstrated that the cation exchange capability of the composite is strictly dependent of the amount ...

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Bioinspired stimuli-responsive multilayer film made of silk–titanate nanocomposites

Cited by 50 publications

References 45 publications

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Photonic nanoarchitectonics with stimuli-responsive 2D materials

Functionalization of Titanates–Silk Nanocomposites via Cation Exchange for Optical Applications

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