Controlled Nanopores in Thin Films of Nonstoichiometrically Supramolecularly Assembled Graft Copolymers

Cho, Suk Man; Song, Giyoung; Hwang, Sun Kak; Kim, Richard Hahnkee; Lee, Jinseong; Yu, Seunggun; Huh, June; Park, Hui Joon; Park, Cheolmin

doi:10.1002/chem.201502866

Cited by 6 publications

(11 citation statements)

References 59 publications

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“…This electrostatic complexing approach to self-assembly can be extended to inorganic nanoparticles, coated with monovalent counter ions, such as primary amine-coated gold nanoparticles [178]. Besides, such polyanionic blocks are also able to organize into stable complexes with polycationic blocks, such as poly(dimethylbenzylammonium) [179] or poly(2-vinylpyridinium) (Figure 4( 8 )) [180,181], and originate a great variety of morphologies, such as core-shell micelles or multilayered membranes, exhibiting a striking pH - and solvent polarity-sensitivity.…”

Section: From Polymer Amphiphilicity To Polyphilicitymentioning

confidence: 99%

Polyphilicity—An Extension of the Concept of Amphiphilicity in Polymers

2018

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Recent developments in synthetic pathways as simple reversible-deactivation radical polymerization (RDRP) techniques and quantitative post-polymerization reactions, most notoriously ‘click’ reactions, leading to segmented copolymers, have broadened the molecular architectures accessible to polymer chemists as a matter of routine. Segments can be blocks, grafted chains, branchings, telechelic end-groups, covalently attached nanoparticles, nanodomains in networks, even sequences of random copolymers, and so on. In this review, we describe the variety of the segmented synthetic copolymers landscape from the point of view of their chemical affinity, or synonymous philicity, in bulk or with their surroundings, such as solvents, permeant gases, and solid surfaces. We focus on recent contributions, current trends, and perspectives regarding polyphilic copolymers, which have, in addition to hydrophilic and lipophilic segments, other philicities, for example, towards solvents, fluorophilic entities, ions, silicones, metals, nanoparticles, and liquid crystalline moieties.

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Section: From Polymer Amphiphilicity To Polyphilicitymentioning

confidence: 99%

Polyphilicity—An Extension of the Concept of Amphiphilicity in Polymers

2018

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“…the Lewis acid/base interaction (for the sulfonic acid/ primary amine group) and hydrogen bonding interaction (for the sulfonic acid and secondary amine group)) resulted in open-core nanopores. [217] Moreover, these phenomena could be similarly observed on various substrates, such as buckled PDMS, natural leaves, and fabric. Particularly, when the STENF was used as a bottom contact layer of TENGs (Figure 7b), the output voltage of the device was 1.5 times that of the TENG based on planar films.…”

Section: Interfacial Design For Flexible Tengsmentioning

confidence: 82%

Interfacial Design and Assembly for Flexible Energy Electrodes with Highly Efficient Energy Harvesting, Conversion, and Storage

Lee

Kwon

et al. 2021

Advanced Energy Materials

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Charge transfer between a conductive support and active materials as well as between neighboring active materials is one of the most critical factors in determining the performance of various electrodes in energy harvesting, conversion, and/or storage. Particularly, when preparing energy electrodes using conductive and/or electrochemically active nanoparticles (NPs), the bulky organic materials (i.e., ligand or polymeric binder) covering the NP surface seriously limit the charge transfer within the electrode, thereby restricting the energy storage or conversion efficiency. Furthermore, the flexibility and mechanical stability of the electrode have been considered important evaluation indices for flexible/wearable energy applications. In this regard, considerable research has been directed toward controlling the interfacial structure to enhance the charge transfer efficiency and toward incorporating functional materials into flexible/porous supports. This review describes the central progress in flexible electrodes for energy harvesting, conversion, and storage, along with the challenges in designing highperformance energy electrodes. In particular, layer-by-layer (LbL) assembly is analyzed, which is an ultrathin film fabrication technology that enables fine tuning of the interfacial structure for various electrode materials. It is shown how LbL assembly can be effectively applied to energy electrodes to obtain desired functionalities and improve the charge transfer efficiency of electrodes.

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“…One was the Lewis acid/base interaction between the sulfonic acid group of SPS and primary amine group of APEO. 34,35 The other was the hydrogen bonding between the sulfonic acid group of SPS and the secondary amine group in the pyridine unit of P2VP, 38 as shown in Figure 1a. The competition between these two interactions resulted in well-defined nanopores even without any postetching processes when the solvent was evaporated during coating, as shown subsequently in detail.…”

Section: Resultsmentioning

confidence: 99%

“…The micelles developed with a binary SPS/P2VP blend without APEO were approxiamtely 50 nm in diameter with the P2VP cores of approximately 40 nm and became larger with APEO in the binary SPS/P2VP blend from approximately 50 nm up to 89 nm in diameter, giving rise to open-core pores of approximately 33 nm in diameter. 38 The use of our ternary solution in diverse coating processes allowed us to conveniently fabricate thin nanoporous films on various topological surfaces over large areas, yielding TENGs, as shown in Figure 1b. The tribo-pair of our device containing a STENF was constructed by fabricating a FOTS-SAM via vapor deposition on a hydroxyl-group-functionalized PDMS placed on a heavily P-doped silicon substrate used as an electrode.…”

Section: Resultsmentioning

confidence: 99%

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Surface-Conformal Triboelectric Nanopores via Supramolecular Ternary Polymer Assembly

et al. 2020

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A triboelectric nanogenerator (TENG) is of tremendous interest owing to its high energy efficiency with a simple device architecture and applicability to various materials. Most previous topological surface modifications introduced for further improving the performance of a TENG are detrimental because they require expensive and/or harsh (e.g., high temperature and acidity) postetching processes, which limit the material choice and design of its components. Herein, we demonstrate an one-step route for developing rapid wetprocessable surface-conformal triboelectric nanoporous films (STENFs). Our method is based on a simple supramolecular assembly of a ternary polymer blend suitable for various conventional solution processes such as spin-, bar-, spray-, and dip-coating. The one-step wet process of a ternary solution produces thin large-area films in which self-assembled, ordered nanopores of approximately 33 nm in diameter are developed even without an additional etching process. The study reveals that the small amount of amine-terminated poly(ethylene oxide) added to the binary blend of sulfonic-acid-terminated poly(styrene) and poly(2-vinylpyridine) efficiently activates the formation of spontaneous nanopores as a pore-generating agent. Our STENF significantly enhances the open-circuit voltage up to 1.5 times higher than that of a planar one, leading to an improved power density of approximately 77 μW/cm 2 . The suitability for diverse conventional coating processes offers a convenient approach for fabricating high-performance STENFs not only on flat substrates such as metals, polymers, and oxides but also on topological ones including wrinkled, roughened surfaces, textile fibers, natural leaves, and fabrics over a large area.

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Controlled Nanopores in Thin Films of Nonstoichiometrically Supramolecularly Assembled Graft Copolymers

Cited by 6 publications

References 59 publications

Polyphilicity—An Extension of the Concept of Amphiphilicity in Polymers

Polyphilicity—An Extension of the Concept of Amphiphilicity in Polymers

Interfacial Design and Assembly for Flexible Energy Electrodes with Highly Efficient Energy Harvesting, Conversion, and Storage

Surface-Conformal Triboelectric Nanopores via Supramolecular Ternary Polymer Assembly

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