Controlling line defects in wrinkling: a pathway towards hierarchical wrinkling structures

Knapp, André; Nebel, Lisa Julia; Nitschke, Mirko; Sander, Oliver; Fery, Andreas

doi:10.1039/d0sm02231d

Cited by 11 publications

(16 citation statements)

References 48 publications

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“…[ 29 ] Equation () indicates that the wavelength of the observed light increases as the value of d increases. [ 30 ] This also explains why the surrounding area with no interlayer pattern remains blue regardless of the colors of the central patterns (the spades in Figure 3), while the central patterns with the underlying chitosan interlayers exhibit a spectral shift from blue to red according to the specific properties of the intermediate layer. At the same time, according to Equation (), the shift in the neutral plane leads to stronger compressive stresses being imposed on the patterned regions with the underlying chitosan interlayer than on the other regions.…”

Section: Resultsmentioning

confidence: 96%

Multimodal Wrinkle Micro‐Nanoarchitectonics by Patterned Surface Material Properties for Transformative Structural Coloration

Park

Jeong

et al. 2023

Advanced Optical Materials

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When an external stimulus is used to generate nanoscale wrinkles on the ductile top surface of a multilayered substrate, the geometrical and optical features are known to be controlled by the material and structural properties of the laminated film. Herein, a thin tri‐layer film is fabricated that can generate various wrinkles on transparent and flexible films in the presence of external mechanical bending. In particular, the wavelength of the wrinkles is shown to be controllable on the tens of nanometers scale by modulating the material properties of each layer. This active modulation plays a critical role in determining the resulting structural color spectra. In other words, the wrinkles function as a diffraction grating so that the film displays bright structural colors under bending conditions. After the bending stress is released, the wrinkles disappear, and the film returns to its transparent state. Finally, the remarkable potential of the material and structural patterning technique is demonstrated for structural coloration applications such as multimodal displays and novel barcode‐based anti‐counterfeiting.

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Section: Resultsmentioning

confidence: 96%

Multimodal Wrinkle Micro‐Nanoarchitectonics by Patterned Surface Material Properties for Transformative Structural Coloration

Park

Jeong

et al. 2023

Advanced Optical Materials

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“…For the proposed photoresistor, we use a PDMS substrate produced by the wrinkling method. The preparation of such wrinkled substrates involves in situ plasma oxidation, operated at microwave frequency [ 50 ] using oxygen as a process gas. The details of the PDMS grating fabrication are provided in the experimental section.…”

Section: Resultsmentioning

confidence: 99%

“…First, a wrinkled PDMS grating that serves as a substrate and has a periodic (sinusoidal) surface profile. In general, the wrinkling technique provides an accessible periodicity range from submicron to micron; [49,50] however, wavelengths up to the millimeter range are also conceivable. [51] Nevertheless, we aim for a periodicity in the lower range of visible light (≈600 nm) because the damping of gold is lower at this wavelength.…”

Section: Charge Transfer Properties Of the Proposed Photoresistormentioning

confidence: 99%

Plasmonic Photoresistor Based on Interconnected Metal‐Semiconductor Grating

Ghosh

Sarkar

Tsuda

et al. 2023

Adv Funct Materials

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Metal‐semiconductor nanostructures in various configurations are extensively used in photodetection, photocatalysis, and photovoltaics. For photodetection purposes, the working principle is straightforward; on illumination, generated charge carriers in excess lead to a decrease in resistance. Notably, using an interconnected metal‐semiconductor grating, it is observed and now reported an opposite response, an increase in the resistance. Such photoresistors are fabricated through wrinkle structuring and oblique angle material deposition methods. It is found that the controlled wrinkling leads to large‐area 1D periodic structures with coexisting cracking perpendicular to the grating direction—such cracks are used as connections between the two‐point contact measurement through the associated gold layer deposition. An enhanced current reduction is further observed on photoexcitation for an additional deposition of an amorphous titania layer. Subsequently, a discussion on the mechanisms and interaction between hot electron injection, charge carrier recombination, and thermalization is presented. Supported by numerical modeling, the angle‐resolved plasmonic modes with the photoresistance can be correlated. The ease of layered deposition of the materials allows one to extend the studies on cavity‐based structures with sandwiched titania layers as hotspots. This simple, scalable, and robust fabrication method thus promises an efficient routeway toward photosensor development in which plasmon‐mediated hot electrons play a crucial role.

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“… [17–25] The responsive, tunable and controllable surface topography of wrinkles formed by these methods make them a potential tool for numerous applications in electronics, optics, adhesives, etc [26,27] . Reviews focusing on the fabrication and applications of surface instability‐induced patterns have been published [28,29] . However, there is a scope for discussing the recent developments, evolving trends, and emerging applications in this field.…”

Section: Introductionmentioning

confidence: 99%

“…[26,27] Reviews focusing on the fabrication and applications of surface instability-induced patterns have been published. [28,29] However, there is a scope for discussing the recent developments, evolving trends, and emerging applications in this field. This review aims to present an up-to-date overview of the fabrication and applications of soft substrate patterns with a focus on wrinkled surfaces of artificial soft materials.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Applications of Wrinkled Soft Substrates: An Overview

et al. 2022

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Morphology of soft materials, including those of natural systems has great influence in controlling their surface functionalities and responses to external stimuli. Surface morphological features of natural soft systems are produced through controlled cell growth and tissue growth. Artificial systems capable of emulating the morphology-dependent physicochemical responses of natural soft substrates can be prepared through various methods such as surface oxidation, thermal stress, compressive stress, etc. Wrinkling is an important morphological irregularity on soft substrates which can be leveraged in this direction. Wrinkling in artificial soft systems can be achieved through several experimental strategies such as compressive stress, thermal stress, surface oxidation, etc. The tunable, reversible and responsive nature of wrinkled soft substrates make them a potential tool for numerous applications in electronics, optics, adhesives, etc. In this review, have briefly summarized and commented on recent developments in different types of wrinkled soft substrates, their preparation, and emergent applications.

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Controlling line defects in wrinkling: a pathway towards hierarchical wrinkling structures

Abstract: We show a novel method to generate highly localized and hierarchical wrinkling structures with controllable branching features.

Cited by 11 publications

References 48 publications

Multimodal Wrinkle Micro‐Nanoarchitectonics by Patterned Surface Material Properties for Transformative Structural Coloration

Multimodal Wrinkle Micro‐Nanoarchitectonics by Patterned Surface Material Properties for Transformative Structural Coloration

Plasmonic Photoresistor Based on Interconnected Metal‐Semiconductor Grating

Fabrication and Applications of Wrinkled Soft Substrates: An Overview

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