Tunable Structural Color Patterns Based on the Visible‐Light‐Responsive Dynamic Diselenide Metathesis

Liu, Cheng; Fan, Zhiyuan; Tan, Yizheng; Fan, Fuqiang; Xu, Huaping

doi:10.1002/adma.201907569

Cited by 115 publications

(94 citation statements)

References 70 publications

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“…In a similar approach, Xu and co‐workers created a dynamical diselenide‐crosslinked polymer for chromatic polarization pattering. [ 125 ] The stress of the film could be controlled by the dynamic diselenide metathesis through irradiations by visible light with different wavelengths. The patterning could be realized by a photolithography process with a mask (Figure 15c), showing a patterning resolution of 6.20 µm (Figure 15d).…”

Section: Strategies For Anticounterfeiting Via Structural Colorsmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

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332

251

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The counterfeiting of goods is growing worldwide, affecting practically any marketable item ranging from consumer goods to human health. Anticounterfeiting is essential for authentication, currency, and security. Anticounterfeiting tags based on structural color materials have enjoyed worldwide and long‐term commercial success due to their inexpensive production and exceptional ease of percept. However, conventional anticounterfeiting tags of holographic gratings can be readily copied or imitated. Much progress has been made recently to overcome this limitation by employing sufficient complexity and stimuli‐responsive ability into the structural color materials. Moreover, traditional processing methods of structural color tags are mainly based on photolithography and nanoimprinting, while new processing methods such as the inkless printing and additive manufacturing have been developed, enabling massive scale up fabrication of novel structural color security engineering. This review presents recent breakthroughs in structural color materials, and their applications in optical encryption and anticounterfeiting are discussed in detail. Special attention is given to the unique structures for optical anticounterfeiting techniques and their optical aspects for encryption. Finally, emerging research directions and current challenges in optical encryption technologies using structural color materials is presented.

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Section: Strategies For Anticounterfeiting Via Structural Colorsmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

Small

332

251

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“…Therefore, invisible patterns with birefringent colors can be achieved through uniaxial stretching the dynamic covalent shape‐memory polymer. [ 133,134 ] The mechanically induced structural colors can only be recognizable through polarized under linear polarization light and become colorless under natural light, providing higher crypticity compared to the plasmon‐based polarization strategy. [ 135 ]…”

Section: Applications Of Mechanochromic Structural‐colored Materialsmentioning

confidence: 99%

Mechanochromism of Structural‐Colored Materials

Chen

Hong

2020

Advanced Optical Materials

134

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In comparison with pigmentary colors, structural colors are with superior chemical stability and are resistant to photobleaching, making them promising candidates for color displays. What is more, the use of toxic dyes can be avoided by utilizing structural-colored materials to display various hues. Structural colors are widespread in nature and observed in opals, [3] beetles, [4] tropical fish, [5] peacock feathers, [6] chameleons, and similar iridescent materials. [7-9] Along with the growing understanding of the morphology and mechanism of natural structural-colored materials, their artificial counterparts have been manufactured with improved performance and functions consequently. Emerging structural-colored materials can be divided into three main categories according to their nanoscale architectures: photonic crystals (PCs), [10] liquid crystals (LCs), [11] and photonic glass. [12] Due to their ability to modulate visible light, the structural-colored materials have been applied in diverse domains such as optical waveguides, [13-16] luminescence enhancement, [17-19] photo electric devices, [20,21] photocatalysts, [22,23] anti-counterfeiting technologies, [24-26] and chemical and biological sensing. [27-29] With ingenious designs of nanostructures, a variety of responsiveness has been obtained on the structural-colored materials, corresponding to varying stimuli such as temperature, [30-32] solvent, [27] gases, [28] magnetic fields, [33] and external forces. [10-12] Among them, the mechanical responsive structural colors are able to visualize invisible stress in the materials, providing effective indicators for mechanical stimuli such as stretching, compression, or bending. Such mechanochromism can be directly achieved by the deformation-induced changes in periodic lattice constants of the structural-colored materials. [34,35] Recently developed mechanochromic structuralcolored materials have extended the responsive functions from conventional mechanical stimuli to complex signals such as electric stimuli. [10] In addition, although the color shift is a predominant method to achieve mechanochromic behavior, [34-36] increasing efforts have been made to develop mechanochromism based on polarization and transparence. [11,37,38] As one of the rapidly developing intelligent materials with multiresponse, [34,39,40] mechanochromic structural-colored materials have become promising in various applications, such as mechanical sensing, [11,41] colorful displays, [10,42] anti-counterfeiting, [26,37] and healthcare materials. [43,44] In this review, we summarize recent advances in mechanochromic structural-colored materials as shown in Figure 1.

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“…Xu and coworkers designed and synthesized a shape memory polymer containing diselenide bond to create variable structural color patterning. 82 The diselenide bond is a visible-light-responsive dynamic covalent bond, which can be formed, cleaved, and metathesized reversibly under certain conditions. The structural color was derived from the birefringence of stretched polymer, and its shape can be fixed while maintaining mechanical stress.…”

Section: Photoresponsive Nonconjugated Polymersmentioning

confidence: 99%

“…Chiral photochromic molecules can twist the nematic LC phase into a helical superstructure, which is named the helical twisting force (HTP, β). 82,103,104 The central wavelength (λ) of the selective reflection is calculated by λ ¼ np, where n is the average refractive index of the CLCs, and HTP is expressed by the formula β ¼ 1∕ðpcÞ, where c is the chiral photochromic molecules concentration. 106,111,112 Therefore, the selective reflection could be regulated through the variations in HTP and the pitch length of the helices, which are caused by the configurational changes of photochromic molecules.…”

Section: Photoresponsive Cholesteric Liquid Crystalsmentioning

confidence: 99%