共查询到20条相似文献,搜索用时 31 毫秒
1.
Hongkyu Eoh Youngdoo Jung Chanho Park Chang Eun Lee Tae Hyun Park Han Sol Kang Seungbae Jeon Du Yeol Ryu June Huh Cheolmin Park 《Advanced functional materials》2022,32(1):2103697
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 solution-blending 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. 相似文献
2.
Tae Hyun Park Hongkyu Eoh Youngdoo Jung Geon-Woo Lee Chang Eun Lee Han Sol Kang Junseok Lee Kwang-Bum Kim Du Yeol Ryu Seunggun Yu Cheolmin Park 《Advanced functional materials》2021,31(11):2008548
Flexible electronics that enable the visualization of thermal energy have significant potential for various applications, such as thermal diagnosis, sensing and imaging, and displays. Thermo-adaptive flexible electronic devices based on thin 1D block copolymer (BCP) photonic crystal (PC) films with self-assembled periodic nanostructures are presented. By employing a thermo-responsive polymer/non-volatile hygroscopic ionic liquid (IL) blend on a BCP film, full visible structural colors (SCs) are developed because of the temperature-dependent expansion and contraction of one BCP domain via IL injection and release, respectively, as a function of temperature. Reversible SC control of the bi-layered BCP/IL polymer blend film from room temperature to 80 °C facilitates the development of various thermo-adaptive SC flexible electronic devices including pixel arrays of reflective-mode displays and capacitive sensing display. A flexible diagnostic thermal patch is demonstrated with the bi-layered BCP/IL polymer blend enabling the visualization of local heat sources from the human body to microelectronic circuits. 相似文献
3.
Dong Ok Shin Duck Hyun Lee Hyoung‐Seok Moon Seong‐Jun Jeong Ju Young Kim Jeong Ho Mun Heesook Cho Soojin Park Sang Ouk Kim 《Advanced functional materials》2011,21(2):201-201
The fabrication and catalytic application of a size‐tunable monodisperse nanoparticle array enabled by block copolymer lithography is demonstrated. Highly uniform vertical cylinder nanodomains are achieved in poly(styrene‐block‐4‐vinylpyridine) (PS‐b‐P4VP) diblock copolymer thin‐films by solvent annealing. The prominent diffusion of the anionic metal complexes into the protonated P4VP cylinder nanodomains occurs through specific electrostatic interactions in a weakly acidic aqueous solution. This well‐defined diffusion with nanoscale confinement enables preparation of the laterally ordered monodisperse nanoparticle array with sub‐nanometer level precise size tuning. The controlled growth of monodisperse nanoparticle arrays is proven by their catalytic use for vertical carbon nanotube (CNT) growth via plasma enhanced chemical vapor deposition (PECVD). Since the size of the catalyst particles is the decisive parameter for the diameters and wall‐numbers of CNTs, the highly selective growth of double‐walled or triple‐walled CNTs could be accomplished using monodisperse nanoparticle arrays. 相似文献
4.
Oriented Nanodomains: Vertical Orientation of Nanodomains on Versatile Substrates through Self‐Neutralization Induced by Star‐Shaped Block Copolymers (Adv. Funct. Mater. 34/2015)
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Sangshin Jang Kyuseong Lee Hong Chul Moon Jongheon Kwak Jicheol Park Gumhye Jeon Won Bo Lee Jin Kon Kim 《Advanced functional materials》2015,25(34):5405-5405
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Materials chemistry and self-assembly properties are usually treated separately, largely limiting the real-time control of their nanostructures and resulting macroscopic properties in advanced self-assembled materials. This study shows a model system that integrates synthesis and self-assembly to achieve controlled periodicity and photonic properties in block copolymers (BCPs) at defined locations. First, the BCP thin films containing a pre-dissolved photo-initiator are swollen with monomer vapors. Upon exposure to UV light, the photoreaction synthesizes homopolymers within the film, which simultaneously blend with the BCPs and modify the periodicity in the exposed regions. This technique is successfully adapted to cylindrical polystyrene-b-polyisoprene-b-polystyrene and lamellar polystyrene-b-poly(2-vinyl pyridine) BCP thin films. This capability is especially useful in the practical application of photonic crystals, where it is shown that the stop band position of polystyrene-b-quaternized-poly(2-vinyl pyridine) photonic gel films can be successfully modulated in situ. A large-scale pattern is then fabricated by using a photomask. This study provides a model system for integrating materials synthesis and self-assembly to achieve spatially defined control over structural periodicity and macroscopic properties in self-assembled materials. 相似文献
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Kathy Van Butsele Sébastien Cajot Sandra Van Vlierberghe Peter Dubruel Catherine Passirani Jean‐Pierre Benoit Robert Jérôme Christine Jérôme 《Advanced functional materials》2009,19(9):1416-1425
In the present work, a method is proposed to assemble pH‐responsive, flower‐like micelles that can expose a targeting unit at their periphery upon a decrease in pH. The micelles are composed of a novel biotinylated triblock copolymer of poly(εε‐caprolactone)‐block‐poly(ethylene oxide)‐block‐poly(2‐vinylpyridine) (PCL‐b‐PEO‐b‐P2VP) and the non‐biotinylated analogue. The block copolymers are synthesized by sequential anionic and ring‐opening polymerization. The pH‐dependent micellization behaviour in aqueous solution of the triblock copolymers developed is studied using dynamic light scattering, zeta potential, transmission electron microscopy (TEM), and fluorimetric measurements. The shielding of the biotin at neutral pH and their availability at the micelle surface upon protonation is established by TEM and surface plasmon resonance with avidin and streptavidin‐coated gold surfaces. The preliminary stealthy behavior of these pH‐responsive micelles is examined using the complement activation (CH50) test. 相似文献
8.
Hyunjung Jung Frank A. Leibfarth Sanghoon Woo Sumi Lee Minhyuk Kang Bongjin Moon Craig J. Hawker Joona Bang 《Advanced functional materials》2013,23(12):1597-1602
Balancing the interfacial interactions between a polymer and substrate is one of the most commonly employed methods to ensure the vertical orientation of nanodomains in block copolymer lithography. Although a number of technologies have been developed to meet this challenge, there remains a need for a universal solution for surface neutralization that combines simple synthesis, fast processing times, generality toward substrate, low density of film defects, and good surface adhesion. The chemistry of ketenes, which combines highly efficient polymer crosslinking through dimerization and surface adhesion through reaction with the substrate, is shown to be well suited to the challenge. The versatile chemistry of ketenes are accessed through the post‐polymerization of Meldrum's acid, which can be easily incorporated into copolymers through controlled radical polymerization processes. Further, the Meldrum's acid monomer is synthesized on a large scale in one step without the need for chromatography. Processing times of seconds, low defect density, simple synthetic procedures, and good substrate adhesion make these materials attractive as robust block copolymer neutralization layers. 相似文献
9.
Simin Chai Zhi Chang Yue Zhong Qiong He Yijiang Wang Yuanlang Wan MingYang Feng Yingzhu Hu WeiHang Li Weifeng Wei Anqiang Pan 《Advanced functional materials》2023,33(27):2370164
Low safety, unstable interfaces, and high reactivity of liquid electrolytes greatly hinder the development of lithium metal batteries (LMBs). Quasi-solid-state electrolytes (QGPEs) with superior mechanical properties and high compatibility can meet the demands of LMBs. Herein, a biodegradable polyacrylonitrile/polylactic acid-block-ethylene glycol polymer (PALE) as membrane skeleton for GPEs is designed and systematically investigated by regulating the length and structure of the cross-linked chain. Benefiting from the enriched affinitive sites of polar functional groups ( CO, C O C, CN, and OH) in highly cross-linked polymer structure, the designed PALE membrane skeleton exhibits flame-retardant property and ultrahigh liquid electrolyte uptake property, and the derived quasi-solid-state PALE GPEs deliver enhanced stretchability and a higher electrochemical stable window of 5.11 V. Besides, the PALE GPEs effectively protect cathodes from corrosion while allowing uniform and fast transfer of Li+ ions. Therefore, the Li||Li symmetrical battery and LFP or NCM811||Li full-cell using PALE GPEs exhibit excellent cycling stability coupled with compact and flat inorganic/organic interface layers. And the excellent cycling stability of pouch cells under harsh operating conditions indicates the application possibilities of PALE GPEs in flexible devices with high-energy-density. 相似文献
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R. Glass M. Arnold J. Blümmel A. Küller M. Mller J.P. Spatz 《Advanced functional materials》2003,13(7):569-575
This paper introduces an approach where the match of two different length scales, i.e., pattern from self‐assembly of block copolymer micelles (< 100 nm) and electron‐beam (e‐beam) writing (> 50 nm), allow the grouping of nanometer‐sized gold clusters in very small numbers in even aperiodic pattern and separation of these groups at length scales that are not accessible by pure self‐assembly. Thus, we could demonstrate the grouping of Au nanoclusters in different geometries such as squares, rings, or spheres. 相似文献
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Sub‐Nanometer Level Size Tuning of a Monodisperse Nanoparticle Array Via Block Copolymer Lithography
Dong Ok Shin Duck Hyun Lee Hyoung‐Seok Moon Seong‐Jun Jeong Ju Young Kim Jeong Ho Mun Heesook Cho Soojin Park Sang Ouk Kim 《Advanced functional materials》2011,21(2):250-254
The fabrication and catalytic application of a size‐tunable monodisperse nanoparticle array enabled by block copolymer lithography is demonstrated. Highly uniform vertical cylinder nanodomains are achieved in poly(styrene‐block‐4‐vinylpyridine) (PS‐b‐P4VP) diblock copolymer thin‐films by solvent annealing. The prominent diffusion of the anionic metal complexes into the protonated P4VP cylinder nanodomains occurs through specific electrostatic interactions in a weakly acidic aqueous solution. This well‐defined diffusion with nanoscale confinement enables preparation of the laterally ordered monodisperse nanoparticle array with sub‐nanometer level precise size tuning. The controlled growth of monodisperse nanoparticle arrays is proven by their catalytic use for vertical carbon nanotube (CNT) growth via plasma enhanced chemical vapor deposition (PECVD). Since the size of the catalyst particles is the decisive parameter for the diameters and wall‐numbers of CNTs, the highly selective growth of double‐walled or triple‐walled CNTs could be accomplished using monodisperse nanoparticle arrays. 相似文献
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L. Cao J.A. Massey M.A. Winnik I. Manners S. Riethmüller F. Banhart J.P. Spatz M. Mller 《Advanced functional materials》2003,13(4):271-276
The diblock copolymers, poly(isoprene‐block‐ferrocenyldimethylsilane) (PI‐b‐PFDMS) and poly(ferrocenyldimethylsilane‐block‐dimethylsiloxane) (PFDMS‐b‐PDMS), form cylindrical micelles with an organometallic polyferrocenylsilane core in a solvent of hexanes. These cylindrical micelles were deposited onto a Si substrate from solution by either spin or dip coating, and upon reactive ion etching, continuous ceramic nanolines with lengths of micrometers and widths as small as 8 nm were created. The nanolines were characterized by scanning force microscopy (SFM) and transmission electron microscopy (TEM), and were shown to contain Fe, Si, and O from X‐ray photoelectron spectroscopy (XPS) studies. The widths of the nanolines could be varied from ca. 8 to 30 nm, depending on the composition of the corona (PI or PDMS). The oriented deposition of these cylindrical micelles can be achieved along pre‐patterned grooves on a resist film using capillary forces. Following treatment with hydrogen or oxygen plasma, oriented ceramic nanolines can be fabricated. The approach reported here represents a relatively simple method to create ceramic nanolines with large aspect ratio on semiconducting substrates. 相似文献
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Surface segregation in blended polymer films has attracted much interest in fundamental research as well as for practical applications. A variety of methodologies have been proposed for controlling surface segregation. They often require long annealing times, however, to achieve thermodynamic equilibrium. Here, a strategy and proof-of-principle experiments are described to control surface segregation of thin block-copolymer (BCP) layers on top of a homopolymer in a single casting step from blended BCP/homopolymer solutions. The surface coverage by the minor constituent BCP (2–10 wt%) is accomplished despite almost identical surface energies of BCP and homopolymer constituents. Immersing this casted solution into water for nonsolvent induced phase separation (NIPS), a nonequilibrium process, affords solidified bilayer ultrafiltration membranes composed of a thin porous surface layer of self-assembled BCP atop an asymmetric porous homopolymer substructure. Key to successful BCP surface segregation is the choice of a binary solvent system based on careful considerations of solvent surface energies and polymer-solvent interaction parameters. Furthermore, stabilizing the BCP micellar structure by a divalent metal additive is also essential. The approach provides a cost-effective method for fabricating bilayer-type asymmetric ultrafiltration membranes with uniform BCP self-assembly based selective top surface pore layers in a single casting step. 相似文献
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Jang Hwan Kim Hyeong Min Jin Geon Gug Yang Kyu Hyo Han Taeyeong Yun Jin Yong Shin Seong‐Jun Jeong Sang Ouk Kim 《Advanced functional materials》2020,30(2)
Nanoscale fabrication of smart materials relying on the molecular self‐assembly of block copolymers (BCPs) has been recognized as a valuable platform for various next‐generation functional structures. In this Progress Report, the recent advances in the BCP self‐assembly process, which has paved the way for viable applications of emerging nanotechnologies, are highlighted. Effective light‐induced self‐assembly based on photothermal annealing of high‐χ BCPs and conformal 3D surface nanopatterning exploiting chemically modified graphene flexible substrates are reviewed as the typical instances of advanced BCP‐based nanofabrication methodologies. Additionally, relevant potential application fields are suggested, namely, graphene nanoribbon field effect transistors, highly tunable refractive index metasurfaces for visible light, high‐sensitivity surface‐enhanced Raman spectroscopy, 2D transition metal dichalcogenide nanopatterning, sequential infiltration synthesis, and organic photovoltaics. Finally, the future research direction as well as innovative applications of these smart nanostructured materials is proposed. 相似文献
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Vertical Orientation of Nanodomains on Versatile Substrates through Self‐Neutralization Induced by Star‐Shaped Block Copolymers
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Sangshin Jang Kyuseong Lee Hong Chul Moon Jongheon Kwak Jicheol Park Gumhye Jeon Won Bo Lee Jin Kon Kim 《Advanced functional materials》2015,25(34):5414-5419
Vertical orientation of lamellar and cylindrical nanodomains of block copolymers on substrates is one of the most promising means for developing nanopatterns of next‐generation microelectronics and storage media. However, parallel orientation of lamellar and cylindrical nanodomains is generally preferred due to different affinity between two block segments in a block copolymer toward the substrate and/or air. Thus, vertical orientation of the nanodomains is only obtained under various pre‐ or post‐treatments such as surface neutralization by random copolymers, solvent annealing, and electric or magnetic field. Here, a novel self‐neutralization concept is introduced by designing molecular architecture of a block copolymer. Star‐shaped 18 arm poly(methyl methacrylate)‐block‐polystyrene copolymers ((PMMA‐b‐PS)18) exhibiting lamellar and PMMA cylindrical nanodomains are synthesized. When a thin film of (PMMA‐b‐PS)18 is spin‐coated on a substrate, vertically aligned lamellar and cylindrical nanodomains are obtained without any pre‐ or post‐treatment, although thermal annealing for a short time (less than 30 min) is required to improve the spatial array of vertically aligned nanodomains. This result is attributed to the star‐shaped molecular architecture that overcomes the difference in the surface affinity between PS and PMMA chains. Moreover, vertical orientations are observed on versatile substrates, for instance, semiconductor (Si, SiOx), metal (Au), PS or PMMA‐brushed substrate, and a flexible polymer sheet of polyethylene naphthalate. 相似文献
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光子晶体光纤 总被引:15,自引:0,他引:15
宁鼎 《光纤与电缆及其应用技术》2004,(1):1-3
光子晶体光纤在光纤的几何结构、模式特性、色散及双折射性质等方面完全不同于传统的光纤。为此介绍了光子晶体光纤的一些重要特性、制作工艺和应用前景。 相似文献
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Philipp Keckeis Elika Drabinov Cristina Ruiz‐Agudo Jonathan Avaro Lisa Glatt Milo Sedlk Helmut Clfen 《Advanced functional materials》2019,29(19)
The solubilization of targeted compounds represents key criteria in the sophisticated field of medical chemistry but also in technical applications like scale removal. Especially, the simultaneous dissolution of two chemically different compounds remains challenging. Herein, macromolecular solubilizers are introduced for the simultaneous dissolution and encapsulation of poorly water‐soluble cholesterol and hydroxyapatite. The peptide‐based, amphiphilic block copolymers possess physicochemically disparate segments combined in one polymer chain as binding sites for hydrophobic as well as ionic materials. Small polymer libraries are synthesized and screened for structure–property relationships. Complementary analytical techniques suggest polymeric self‐assembly into spherical adaptive nanoparticles with the fundamental ability to passively absorb significant amounts of hydrophobic cholesterol up to 33 wt%. Furthermore, the additional incorporation of acidic domains enables the simultaneous dissolution of hydrophobic compounds and mineral phases such as hydroxyapatite. Ultimately, those nontoxic block copolymers can be used to solubilize and absorb other lipophilic and ionic compounds such as Sudan III dye and calcium ions. Such multifunctional nanomaterials have a wide range of direct application for simultaneous dissolution or delivery of hydrophobic molecules and cations resp. minerals for instance in the field of atherosclerosis. 相似文献