Variable structural colouration of composite interphases

Deng, Yinhu; Gao, Shang‐Lin; Liu, Jianwen; Gohs, Uwe; Mäder, Edith; Heinrich, Gert

doi:10.1039/c6mh00559d

Cited by 17 publications

(13 citation statements)

References 45 publications

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“…64,65 However, to make more efficient use of the structural color for sensing, the nanosheets need to be assembled into solvent-free photonic architectures. 40,50,66,67 To achieve this, the most important, liquid-assisted strategies for nanosheets are spin or dipcoating. 27,40,41,50,56,58,[68][69][70] The crucial parameters for nanosheet deposition using these methods are the concentration, wetting properties and volatility of the solvent.…”

Section: D Materials For Structural Colorationmentioning

confidence: 99%

“…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%

“…One of the very few examples of a colorimetric mechanical sensor (Fig. 4a) 67 based on 2D materials is derived from multilayer graphene nanoplatelets coated on a glass fibre. Under tensile strain or compressive stress, the thickness of the graphene layer decreases, resulting in a blue shift of the interference-based color (see eqn (1)).…”

Section: D Materials For Structural Colorationmentioning

confidence: 99%

“…Under tensile strain or compressive stress, the thickness of the graphene layer decreases, resulting in a blue shift of the interference-based color (see eqn (1)). 67 Photonic temperature sensors based on 2D materials include liquid crystalline H 0.52−x TMA x Ti 0.87 O 2 and 1D PC Mg-Al-NO 3 LDH/TiO 2 sensors (Fig. 4b and c).…”

Section: D Materials For Structural Colorationmentioning

confidence: 99%

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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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Section: D Materials For Structural Colorationmentioning

confidence: 99%

Section: D Materials For Structural Colorationmentioning

confidence: 99%

Section: D Materials For Structural Colorationmentioning

confidence: 99%

Section: D Materials For Structural Colorationmentioning

confidence: 99%

See 2 more Smart Citations

Photonic nanoarchitectonics with stimuli-responsive 2D materials

Ganter

Lotsch

2019

Mol. Syst. Des. Eng.

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“…A clear color‐shift, which requires a shift in the absorption band, would provide a fast, visible warning sign for mechanical stress or deformations in the material. Moreover, mechanochromic polymers might be useful in many emerging materials and applications, e.g., in artificial skin, wearable, camouflage systems, and attoreactor sensors, and for anti‐counterfeiting …”

mentioning

confidence: 99%

Remarkable Mechanochromism in Blends of a π‐Conjugated Polymer P3TEOT: The Role of Conformational Transitions and Aggregation

Zessin

Schnepf

Oertel

et al. 2019

Advanced Optical Materials

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respond to mechanical stress with a change of their absorption and fluorescence features, [1][2][3] have been previously considered to monitor the material's failure. A clear color-shift, which requires a shift in the absorption band, would provide a fast, visible warning sign for mechanical stress or deformations in the material. Moreover, mechanochromic polymers might be useful in many emerging materials and applications, e.g., in artificial skin, wearable, camouflage systems, and attoreactor sensors, and for anti-counterfeiting. [4][5][6][7][8][9] There are two major approaches to build up polymer-based mechanochromic materials. The first is the incorporation of so-called aggregachromic dyes into polymer matrixes to form thermodynamically stable micro-/nano-sized aggregates. [6,10] Aggregachromic dyes are planar, rigid π-conjugated small molecules, which form J-or H-aggregates through the π-stacking interactions and exhibit distinct optical properties as compared to the monomeric species (bathochromically or hypsochromically shifted absorptions/emissions). The second approach involves a covalent linking of chromogenic units to polymer chains. [11,12] The colorimetric transition can originate from changing molecular interactions, e.g., aggregation, [6,13] or caused by chemical transformations. [11,14,15] Common chromogenic units are organic molecules [16] or organometallic complexes. [17,18] The use of π-conjugated polymers (CPs) as chromogenic units is rare and mainly based on the cis-trans isomerization of acetylene derivatives. [19][20][21][22] One of the most abundant mechanisms responsible for the mechanochromism is the aggregation-induced change of the material optical properties (absorption and/or fluorescence) on the response of the mechanical stress. [10,23,24] For such systems to perform properly, the active chromophore should be evenly distributed in the matrix and be present at substantial amounts, around a critical aggregation concentration (typically in 0.1-1% range), which is not always convenient and cheap.We propose CPs as interesting alternative to aggregachromic dyes for mechanochromic materials. Due to their extended π-conjugated systems along their polymer backbone, CPs possess a strong absorption and luminescence in the visible range of the electromagnetic spectrum. Moreover, their optical properties are very sensitive to any conformational perturbations, as was successfully demonstrated in sensory devices. [25,26] Conformation-induced mechanochromism was already demonstrated A novel mechanism for well-pronounced mechanochromism in blends of a π-conjugated polymer based on reversible conformational transitions of a chromophore rather than caused by its aggregation state, is exemplified. Particularly, a strong stretching-induced bathochromic shift of the light absorption, or hypsochromic shift of the emission, is found in blends of the water-soluble poly(3-tri(ethylene glycol)) (P3TEOT) embedded into the matrix of thermoplastic polyvinyl alcohol. This counterintuitive phenomenon is explaine...

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Graphene and CNT‐Based Smart Fiber‐Reinforced Composites: A Review

Islam

Afroj

Uddin

et al. 2022

Adv Funct Materials

101

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Multifunctional fiber-reinforced polymer (FRP) composites provide an ideal platform for next-generation smart composites applications including structural health monitoring, electrical and thermal conductivity, energy storage and harvesting, and electromagnetic interference shielding without compromising their mechanical properties. Recent progress in carbon-based nanomaterials such as graphene and carbon nanotubes (CNTs) has enabled the development of many novel multifunctional composites with excellent mechanical, electrical, and thermal properties. However, the effective incorporation of such carbon nanomaterials into FRP composites using scalable, high-speed, and cost-effective manufacturing without compromising their performance is challenging. This review summarizes the recent progress on graphene and CNT-based FRP composites, their manufacturing techniques, and their applications in smart composites. Current technical challenges and future perspectives on smart FRP composites research to facilitate an essential step toward moving from research and development-based smart composites to industrial-scale mass production are also discussed.

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Variable structural colouration of composite interphases

Abstract: Variable structural colouration from red, orange, yellow to green is realised by mechanically tuning a composite interphase region.

Cited by 17 publications

References 45 publications

Photonic nanoarchitectonics with stimuli-responsive 2D materials

Photonic nanoarchitectonics with stimuli-responsive 2D materials

Remarkable Mechanochromism in Blends of a π‐Conjugated Polymer P3TEOT: The Role of Conformational Transitions and Aggregation

Graphene and CNT‐Based Smart Fiber‐Reinforced Composites: A Review

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