Printable and Rewritable Full Block Copolymer Structural Color

Kang, Han Sol; Lee, Jinseong; Cho, Suk Man; Park, Taehyun; Kim, Min Ju; Park, Chanho; Lee, Seungwon; Kim, Kang Lib; Ryu, Du Yeol; Huh, June; Thomas, Edwin L.; Park, Cheolmin

doi:10.1002/adma.201700084

Cited by 108 publications

(92 citation statements)

References 37 publications

(98 reference statements)

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“…At the lab scale they are fabricated via spin‐coating (Figure a),[7b,33e,68a,84] dip‐coating (Figure d),[28e] layer‐by‐layer deposition, and by the self‐assembling of block copolymers (BCPs, Figure ) . The latter is arising interest thanks to the possibility to couple polymers pairs otherwise not processable together . The generation of ordered and periodic lattices by BCPs self‐assembling is driven by the blocks chain length ( N) and the Flory–Huggins parameter (χ), because χ∙N describes the strength of the repulsive interaction between blocks .…”

Section: Materials and Fabrication Techniquesmentioning

confidence: 99%

“…Indeed, large area commercial polymer DBRs have been demonstrated to be efficient for color tuning in electrically driven devices using emitting conjugated polymers . In this regard, Thomas and co‐workers reported on electrochemically tunable block copolymer multilayers which can change their color from red to green and blue applying low voltages ( Figure ) . The DBRs are made of a PS:(poly 2‐vinylpyridine) (P2VP) block copolymer filled with trifluoroethanol, and exploit swelling of the P2VP block achieved through oxidation/reduction processes, which modify the layer thicknesses.…”

Section: Applicationsmentioning

confidence: 99%

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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: Materials and Fabrication Techniquesmentioning

confidence: 99%

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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“…The transport across the alternating PS and QP2VP in-plane layers occurs via the vertically oriented screw dislocations created while preparing the IG layer on the BCP layer. In our previous work, numerous screw dislocations a few micrometers in size developed in a BCP film 39 . When mechanical tensile stress is applied to a ductile film on an elastic substrate, the microcracks will deform slowly and withstand repeated loading and unloading cycles 40 .…”

Section: Mechanism Of the Reversible Visualization Of Strain In The Bmentioning

confidence: 91%

Block copolymer structural color strain sensor

et al. 2018

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The development of electrically responsive sensors based on the capacitance, voltage, and resistance that can detect and simultaneou sly visualize the large strain involved with human motion is in great demand. Here, we demonstrate a highly stretchable, large strain capacitive sensor that can visualize strain based on the strain-responsive structural color (SC). Our device contains an elastomeric sensing film that produces a capacitance change under strain, in which a selfassembled block copolymer (BCP) photonic crystal (PC) film with 1D periodic in-plane lamellae aligned parallel to the film surface is embedded for the efficient visualization of strain. The capacitance change arises from changes in the dimensions of the elastomer film under strain. The mechanochromic BCP PC film responds to strain, giving rise to an SC change with strain. The initial red SC of the sensor blueshifts and turns blue when the sensor is stretched to 100%, resulting in a full-color SC alteration as a function of the strain. Our BCP SC strain sensor exhibits a fast strain response with multi-cycle reliability of both the capacitance and SC changes over 1000 cycles. This property allows for efficient visible recognition not only of the strained positions during finger bending and poking with a sharp object but also of the shapes of the strained objects.

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“…(VI) Optical images of ink‐jet‐printed lines using a black ink on a white paper (left) and the lines ink‐jet printed with an APS ink on a red color block‐copolymer film, swollen with EtOH (right). Reproduced with permission . Copyright 2017, Willey‐VCH.…”

Section: Emerging Optical Applications Of Ordered Micro/nanostructuresmentioning

confidence: 99%

“…The resolution (72 µm) is comparable with that of a commercial ink‐jet printer (50 µm). Especially, the reversible cross‐linking and uncross‐linking by aqueous APS and aqueous HBr enabled the controllable printing/erasing over 50 cycles …”

Section: Emerging Optical Applications Of Ordered Micro/nanostructuresmentioning

confidence: 99%

Ordered Hybrid Micro/Nanostructures and Their Optical Applications

Zhang

Yang

2019

Advanced Optical Materials

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known that the optical properties related refractive index is an important parameter for ordered micro/nanostructures. Commonly, organic substances own lower refraction. Aiming at improving which, researchers introduce highly polarizable heteroatoms or rigid aromatic moieties. However, the maximum of refractive index is limited to 1.54-1.60, [3] which is far from the requirements of rapidly developing technologies. [4] Incorporation of inorganic materials with relative higher refractive index (TiO 2 , ZnO, ZnS, graphene nanoparticles, and Si) into an organic matrix is capable of enlarging the optical parameters to a great extent, generally up to a value of 2.5-3.0, [5] which offers more chances for the fabrication of novel ordered micro/nanostructures. Photonic crystals (PCs), for example, regularly arrange materials of high and low dielectric constants on the order of the wavelength of light. The photonic bandgap (PBG) prohibiting the propagation of light results from the sufficient dielectric contrast and appropriate geometry. The structural color therefore generates. Manipulating the propagation of light via micro/nanostructures meets the requirements for modern optical devices. [6] As a result, more efforts have been applied to devices consisting of micro/nanostructures of multiple materials, such as synthetic materials and biomaterials. [7] Besides optical properties, the strength and toughness of ordered micro/nanostructures are also improved based on the hybrid material. Meanwhile, the electric and magnetic features of inorganic dopants can also exactly assist the adjustability. Therefore, the hybrid can significantly improve performance compared with its constituent.This review emphasizes on applications sought (sensing, imaging, communication, photoelectricity, etc.), the materials used (silicon, metals, polymers, etc.), and the preparation methods employed (patterning, etching, deposition, etc.). We present an attempt to classify and compare some intensively reported micro/nanostructures of hybrid materials and/or heterogeneous structures, along with recent important developments in literatures. It is organized as follows: First, we summarize some fundamental physical principles and concepts in brief. Second, we particularly highlight artificial and natural laminar structures, represented by Bragg stacks (BSs) and butterfly wings, which have drawn much attention in the latest literatures. Next, the focus shifts to the preparation routes and materials adoption of colloidal crystals and their derived periodic arrays. A few examples of highly functional materials Recent advances in manufacturing and technology of ordered hybrid micro/ nanostructures have acquired many breakthroughs. With the aid of the cooperation of various materials, the ordered hybrid micro/nanostructures exhibit high-quality performance and mechanical stability and allow the modulation on the light-matter interaction in a controllable manner, thereby enabling a wide variety of innovative applications. This article reviews recent deve...

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Printable and Rewritable Full Block Copolymer Structural Color

Cited by 108 publications

References 37 publications

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Block copolymer structural color strain sensor

Ordered Hybrid Micro/Nanostructures and Their Optical Applications

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