Photonic Crystals: Photoresponsive Block Copolymer Photonic Gels with Widely Tunable Photosensitivity by Counter‐Ions (Adv. Mater. 23/2012)

Ahn, Youshin; Kim, Eun-Joo; Hyon, Jinho; Kang, Changjoon; Kang, Youngjong

doi:10.1002/adma.201290136

Cited by 3 publications

(4 citation statements)

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“…8 PC patterns achieved through selective-area immobilization. Patterns induced by a (A) magnetic field and UV curing, 71 (B) electric field and UV curing, 72 (C) selective photolysis modification process, 202 (D) counteranion with photosensitivity, 97 (E) regioselective thermal compression, 193 and (F) programmed thermal input and compression. 214 bandgaps and dynamic chemical patterns based on a selfreporting feature of the PC (Fig.…”

Section: Responsive Pc Patternsmentioning

confidence: 99%

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Bio-inspired photonic crystal patterns

2020

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Section: Responsive Pc Patternsmentioning

confidence: 99%

“…8D). 97 Heat-curing crosslinking is also an important approach to achieve the permanent preservation of PC patterns. The crosslinking degree can be modified by changing the temperature per curing cross-linking reaction of the photoresist, contributing to the regional PC structure.…”

Section: Responsive Pc Patternsmentioning

confidence: 99%

Bio-inspired photonic crystal patterns

2020

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“…Material templating at the nanoscale is of much scientific interest. − In particular, thin films of diblock copolymers have gained attention because of their nanoscale domains, easy processing, and environment-based responsiveness, which arise from the blocks’ different solvent interactions. ,− These systems offer templating with natural , and controllable ,− orders that can act as scaffolds for other materials, ,,− align nanoparticles, ,,− offer chemical ,,− and topographic ,,,,,− surface control, and serve as ion channels, , antireflective coatings, , and photonic gels. − …”

Section: Introductionmentioning

confidence: 99%

Enhanced Corrugation and Chemical Contrast of Diblock Copolymer Films by Sequential Solvent Exposures

Malachosky¹,

Filatov²,

Guyot‐Sionnest³

2018

J. Phys. Chem. C

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Planar cylinder polystyrene−block-poly(2-vinylpyridine) (PS−P2VP) diblock copolymer thin films, with no corrugation and a uniform PS surface, undergo major restructuring upon sequential solvent swelling, yielding 10 nm P2VP ridges separated by PS troughs. Ovenannealed thin films were exposed to P2VP selective solvents, with or without an intermediate tetrahydrofuran vapor treatment, and the resulting surface morphologies were characterized. Experiments indicate that tetrahydrofuran enhances the permeability of the PS matrix to the P2VP selective solvents, with the ultimate swelling topography dictated by the hydrocarbon chain length and pK a of the selective solvent. We show that the film swelling occurs in stages, with P2VP punching to the surface as puckered pillars that eventually link into ridges separated by PS troughs. The chemical duality of the surfaces allows the selective deposition of negatively charged gold nanoparticles on the P2VP ridges.

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“…[6,7] In addition to SCs arising from PCs based on colloidal assemblies and layer-by-layer fabricated hydrogels, [8][9][10] SCs arising from self-assembled block copolymer (BCP) PCs are of interest owing to facile and reversible alteration of both microstructures and dielectric constants of the constituent BCP domains upon various stimuli. [11,12] Many examples of such stimuli-interactive SC changes of BCP PCs are observed with electric, [13][14][15][16][17] magnetic, [18,19] solvating, [20,21] thermal, [7,22,23] and mechanical stimuli. [24][25][26][27] Development of the high performance SC of BCP PCs, however, requires a swelling agent due to the insufficient domain size, which often results in the maximum reflection of a typical BCP PC occurring in the UV region.…”

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confidence: 99%

Photonic Crystal Palette of Binary Block Copolymer Blends for Full Visible Structural Color Encryption

Eoh

Jung

Park

et al. 2021

Adv Funct Materials

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Structural color (SC) arising from a periodically ordered self-assembled block copolymer (BCP) photonic crystal (PC) is useful for reflective-mode sensing displays owing to its capability of stimuli-responsive structure alteration. However, a set of PC inks, each providing a precisely addressable SC in the full visible range, has rarely been demonstrated. Here, a strategy for developing BCP PC inks with tunable structures is presented. This involves solutionblending of two lamellar-forming BCPs with different molecular weights. By controlling the mixing ratio of the two BCPs, a thin 1D BCP PC film is developed with alternating in-plane lamellae whose periodicity varies linearly from ≈46 to ≈91 nm. Subsequent preferential swelling of one-type lamellae with either solvent or non-volatile ionic liquid causes the photonic band gap of the films to red-shift, giving rise to full-visible-range SC correlated with the pristine nanostructures of the blended films in both liquid and solid states. The BCP PC palette of solution-blended binary solutions is conveniently employed in various coating processes, allowing facile development of BCP SC on the targeted surface. Furthermore, full-color SC paintings are realized with their transparent PC inks, facilitating low-power pattern encryption.

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Photonic Crystals: Photoresponsive Block Copolymer Photonic Gels with Widely Tunable Photosensitivity by Counter‐Ions (Adv. Mater. 23/2012)

Cited by 3 publications

References 0 publications

Bio-inspired photonic crystal patterns

Bio-inspired photonic crystal patterns

Enhanced Corrugation and Chemical Contrast of Diblock Copolymer Films by Sequential Solvent Exposures

Photonic Crystal Palette of Binary Block Copolymer Blends for Full Visible Structural Color Encryption

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