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Self-defined dual charge percolation networks for solution-processed multithreshold transistors Check for updates

npj Flexible Electronics 2024年第1期8卷 1-10页

作者： Jung Woo Moon Seunghan Kim Jin Hyeon Kim Sunil V.Barma Sang Young Jeong Jinho Keum Ho Sun Lim Youngjae Yoo Han Young Woo Sae Byeok Jo Moon Sung Kang Jeong Ho Cho Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul03722Republic of Korea Department of Chemical and Biomolecular Engineering Institute of Emergent MaterialsSogang UniversitySeoul04107Republic of Korea School of Chemical Engineering SKKU Institute of Energy Science and Technology(SIEST)Sungkyunkwan University(SKKU)Suwon16419Republic of Korea Department of Chemistry Korea UniversitySeoul02841Republic of Korea Department of Chemical and Biological Engineering Institute of Advanced Materials and SystemSookmyung Women’s UniversitySeoul04310Republic of Korea Department of Advanced Materials Engineering Chung-Ang UniversityAnseong-si17546Republic of Korea

This study demonstrates multithreshold engineering of a solution-processed heterojunction electrochemical transistor using a blend of n-type CdSe tetrapod-shaped nanocrystals(TpNCs)and an n-type polymeric organic semiconductor(OSC).The unique geometry of TpNCs enables a broad concentration range of charge percolation,where charge transfer between TpNC and OSC domains determines multiple threshold *** OSC domain’s threshold voltage shifts from 1 to−1 V as TpNC content increases,while the TpNC domain maintains a threshold above 1.5 *** allows for stable intermediate states,crucial for multivalued logic *** percolation and photoluminescence studies show selective charge redistribution,shifting the threshold voltages in the polymer *** logic gates,including TNOT,TNAND,and TNOR,based on these heterojunction transistors,were also demonstrated,highlighting the potential of this approach for advanced logic applications.

关键词： heterojunction transistors charge

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Two-Step Graphene Strategy Enabling Long-Cycle Stability of Silicon Anodes

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ACS Energy Letters 2025年第6期10卷 2718-2726页

作者： Kim, Jun Beom Baek, Jaewon Jayaraman, Balamurugan Cha, Sujin Lee, Gang San Yoon, Yeo Hoon Choi, Go Bong Cheng, Colin Wing-Lok Lim, Joonwon Kim, Hee-Tak Kim, Sang Ouk Department of Materials Science and Engineering KAIST Daejeon34141 Korea Republic of Department of Chemical and Biomolecular Engineering KAIST Daejeon34141 Korea Republic of Department of Information Display Kyung Hee University Seoul02447 Korea Republic of

A two-step graphene-reinforced hierarchical structure to address the poor cycle stability due to significant volume fluctuations in silicon anodes for lithium-ion batteries (LIBs) is introduced in this study. Fine composite granules (1-2 μm), SiNPs@rGO where silicon nanoparticles (SiNPs) were fully encapsulated by reduced graphene oxide (rGO) flakes, were synthesized by a high-power planetary ball milling technique. The compact structure of the SiNPs@rGO granules effectively suppressed the dispersion loss of Si and LixSi fragments from the granules. To accommodate the large volume fluctuation of Si in lithiation and delithiation cycles, a hierarchical structure using mechanically flexible and stretchable holey reduced graphene oxide (HrGO) 2D layers was developed. The hierarchical structure of HrGO/SiNPs@rGO composite anode successfully accommodated the volume fluctuations of SiNPs@rGO, thereby markedly enhancing long-cycle stability. Systematic analyses of the characteristic electrochemical properties and morphological evolution of these 2D material-based anodes are reported. © 2025 American chemical Society.

关键词： Lithium-ion batteries

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Mechanically driven assembly of biomimetic 2D-material microtextures with bioinspired multifunctionality

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Nano Research 2024年第2期17卷 663-678页

作者： Yang Li Lin Jing Joshua M.Little Haochen Yang Tsai-Chun Chung Po-Yen Chen Department of Chemical and Biomolecular Engineering University of MarylandCollege ParkMD 20740USA Maryland Robotics Center University of MarylandCollege ParkMD 20742USA School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Nature provides a wealth of bio-inspiration for advanced material *** various nanomaterials into biomimetic microtextures with bioinspired functionalities has spurred increasing research interests and facilitated technological advances in various *** recent years,two-dimensional materials(2DMs)have emerged as important building block units in the biomimicry field due to their distinct chemical,physical,electrical,electrochemical,and catalytic *** this review article,various mechanically driven assembly approaches are summarized to fabricate various genealogies of biomimetic 2DM microtextures with bio-inspired ***,sequential deformation strategies are discussed to programmably construct higher dimensional 2DM microtextures,ranging from wrinkles/crumples(one-time deformation)to multiscale hierarchies(multiple deformations).Next,the current progress using higher dimensional 2DM microtextures to imitate different biological structures and/or induce bio-inspired multifunctionality is systematically *** showcases of bio-inspiration and biomimicry using different 2DM nanosheets are highlighted:(1)wrinkle patterns of an earthworm that spur the design of strain sensors with programmable working ranges and sensitivities,(2)wrinkle appearance of a Shar-Pei dog that motivates the fabrication of stretchable energy storage devices,(3)hierarchical scale textures of a desert lizard that inspire cation-induced gelation platforms for 2DM aerogels,and(4)wrinkle skin of an elephant that influences the development of 2DM protective skin for soft ***,challenges and future opportunities of adopting 2DM nanosheets to assemble biomimetic microstructures with synergistic functionalities are discussed.

关键词： two-dimensional(2D)materials mechanically driven assembly biomimetic microtextures functional nanocomposite bio-inspired multifunctionality

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3D-Printing of Hierarchical Porous Copper-Based Metal-Organic-Framework Structures for Efficient Fixed-Bed Catalysts

Chem and Bio Engineering

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Chem and Bio engineering 2024年第3期1卷 264-273页

作者： Xing, Ruizhe Huang, Renliang Su, Rongxin Kong, Jie Dickey, Michael D. Qi, Wei School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi’an710072 China Department of Chemical and Biomolecular Engineering North Carolina State University RaleighNC27695 United States School of Marine Science and Technology Tianjin University Tianjin300072 China School of Chemical Engineering and Technology Tianjin University Tianjin300072 China

Metallic structures with hierarchical open pores that span several orders of magnitude are ideal candidates for various catalyst applications. However, porous metal materials prepared using alloy/dealloy methods still struggle to achieve continuous pore distribution across a broad size range. Herein, we report a printable copper (Cu)/iron (Fe) composite ink that produces a hierarchical porous Cu material with pores spanning over 4 orders of magnitude. The manufacturing process involves four steps: 3D-printing, annealing, dealloying, and reannealing. Because of the unique annealing process, the resulting hierarchical pore surface becomes coated with a layer of Cu-Fe alloy. This feature imparts remarkable catalytic ability and versatile functionality within fixed bed reactors for 4-nitrophenol (4-NP) reduction and Friedländer cyclization. Specifically, for 4-NP reduction, the porous Cu catalyst demonstrates an excellent reaction rate constant (kapp = 86.5 × 10-3 s-1) and a wide adaptability of the substrate (up to 1.26 mM), whilst for Friedländer cyclization, a conversion over 95% within a retention time of only 20 min can be achieved by metal-organic-framework-decorated porous Cu catalyst. The utilization of dual metallic particles as printable inks offers valuable insights for fabricating hierarchical porous metallic structures for applications, such as advanced fixed-bed catalysts. © 2024 The Authors. Co-published by Zhejiang University and American chemical Society.

关键词： Cyclization

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Weakly coordinating cationic polymer electrolytes for fast-charging solid-state lithium-metal batteries

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Journal of Energy Chemistry 2025年第06期 243-251页

作者： Soohyoung Lee Kyeong-Seok Oh Ji Eun Lee Sun-Phil Han Hong-I Kim Sang Kyu Kwak Sang-Young Lee Department of Battery Conflation Engineering Yonsei University Department of Chemical and Biomolecular Engineering Yonsei University School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) UNIST Central Research Facilities Ulsan National Institute of Science and Technology (UNIST) Department of Chemical and Biological Engineering Korea University

Despite the growing interest in fast-cha rging solid-state lithium（Li）-metal batteries（SSLMBs）,their practical implementation has yet to be achieved,primarily due to an incomplete understanding of the disparate and often conflicting requirements of the bulk electrolyte and the electrode-electrolyte ***,we present a weakly coordinating cationic polymer electrolyte（WCPE） specifically designed to regulate the Li+coordination structure,thereby enabling fast-charging *** WCPE comprises an imidazolium-based polycationic matrix combined with a succinonitrile（SN）-based highconcentration *** conventional neutral polymer matrices,the polycationic matrix in the WCPE competes with Li+for interactions with SN,weakening the original coordination between SN and Li+.This modulation of SN-Li+interaction improves both Li+conductivity of the WCPE(σLi+=1.29mS cm-1) and redox kinetics at the electrode-electrolyte ***,SSLMB cells（comprising LiFePO4cathodes and Li-metal anodes） with the WCPE achieve fast-charging capability（reaching over80% state of charge within 10 min）,outperforming those of previously reported polymer electrolytebased SSLMBs.

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Tuning the thermal response of 3D-printed bilayer hydrogels via architectural control using binary ethanol-water solvent systems

RSC Applied Polymers

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RSC Applied Polymers 2024年第6期2卷 1062-1073页

作者： Klincewicz, Francis Kalidindi, Subhash Korley, LaShanda T. J. Department of Materials Science and Engineering University of Delaware Newark 19716 DE United States Department of Chemical and Biomolecular Engineering University of Delaware Newark 19716 DE United States

While stimuli-responsive materials can be prepared via many established procedures, digital light processing (DLP) 3D printing offers a simple and robust technique for the fabrication of hydrogels, including spatially-defined bilayer hydrogels. The use of synthesis solvent mixtures has recently gained attention as a facile alternative to more complicated chemical modifications to tune hydrogel morphology by exploiting solvent-monomer interactions and cononsolvency which, by extension, modulates stimuli-response time and magnitude. In this work, we utilized a binary solvent system consisting of ethanol and water to induce morphological changes within a thermally-responsive poly(N-isopropyl acrylamide) (pNIPAAm) hydrogel during polymerization. By varying the ratio of ethanol to water, we demonstrated that hydrogel properties, such as crosslink density, pore morphology, and thermal response, can be tuned and correlated. While mass expulsion was fastest in gels prepared in 100% ethanol, we found that gels prepared in 75%-25% ethanol-water and 50%-50% ethanol-water maintained mechanical integrity at high temperatures, allowing expulsion of water mass without large amounts of contraction. We utilized the experimental findings from the monolayer hydrogel studies and investigated the response of bilayer structures comprised of pNIPAAm hydrogel layer and a non-responsive poly(2-hydroxyethyl acrylate) (pHEA) hydrogel layer and applied a mathematical model to better understand the fundamental kinematics of these bilayer systems in response to temperature. We also demonstrated the utility of these bilayer hydrogels for use in soft robotics applications. Overall, this work highlights that modulation of binary solvent mixture ratios is a strategy that enables control of morphological and mechanical features of stimuli-responsive hydrogels via 3D printing. © 2024 RSC.

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3D-architected acceptor affords efficient, stable and stretchable photovoltaics

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National science Review 2025年第4期 85-87页

作者： Jin-Woo Lee Jung-Yong Lee Bumjoon J.Kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST)

Polymer solar cells(PSCs) have emerged as a transformative photovoltaic technology, offering inherent advantages such as light weight, flexibility, cost-effectiveness and environmental friendliness [1].These attributes make PSCs particularly suitable for applications in wearable devices. Over the past decades, the evolution from fullerene-based acceptors to diverse small-molecule acceptors(SMAs) has been driven by innovative molecular design and in-depth understanding of the structure-performance relationships [2].

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Cross-Disciplinary Advances in Battery Research

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JACS AU 2025年第5期5卷 2059-2060页

作者： Lee, Hyunjoo Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology 291 Daehak-ro Daejeon 34141 South Korea

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Recent advances on the systems metabolically engineered Pseudomonas species as versatile biosynthetic platforms for the production of polyhydroxyalkanoates

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Systems Microbiology and Biomanufacturing 2024年第2期4卷 473-499页

作者： Hye Min Song Seo Young Jo Haeyoung Lee Subeen Jeon Dohye Yun Chaerin Kim Jina Son Yu Jung Sohn Jong-Il Choi Si Jae Park Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and EngineeringEwha Womans UniversitySeoul 03760Republic of Korea Department of Biotechnology and Bioengineering Chonnam National UniversityGwangju 61186Republic of Korea

Pseudomonas *** been considered one of the most promising microbial platform strains due to its versatile metabolism,enabling the valorization of waste materials into value-added chemical *** the native producer of polyhydroxyal-kanoates(PHAs),the biodegradable biopolyesters,it has been widely engineered by various metabolic engineering tools for the production of PHAs composed of short-chain-length and medium-chain-length monomers with adjustable composition from diverse carbon sources,ranging from pure sugars to crude oils and fatty *** review discusses the feasibility of Pseudomonas *** the industrial host strain and the recent advances regarding the systems metabolic engineering strategies for PHAs production in Pseudomonas sp.

关键词： Pseudomonas sp. Polyhydroxyalkanoates Systems metabolic engineering Synthetic biology Fermentation

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Electrocatalytic Reduction of CO_(2)to CO with Almost 100%Faradaic Efficiency Using Oxygen-Vacancy Enriched Two-Dimensional MgO

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CCS Chemistry 2024年第6期6卷 1477-1486页

作者： Yu Han Sunggi An Xinyu Zhan Leiduan Hao Liang Xu Song Hong Dongmin Park Yuxin Chen Yiwen Xu Jiwen Zhao Xinyi Tan Alex W.Robertson Yousung Jung Zhenyu Sun State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029 Department of Chemical and Biomolecular Engineering(BK21four) Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141 Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081 Department of Physics University of WarwickCoventry

The design and development of cheap,abundant,and efficient electrocatalysts for selective CO_(2)electroreduction is highly desirable yet remains an ongoing ***,we report on our discovery of the use of two-dimensional MgO rich in oxygen vacancies(VO)as an electrocatalyst for the efficient reduction of CO_(2)to yield CO in 1-butyl-3-methylimidazolium hexafluorophosphate dissolved in *** faradaic efficiency toward CO reaches as high as 99.6±0.24%with a current density of up to 40.8 mA cm−*** functional theory calculations illustrate that the introduction of VO in MgO substantially lowers the reaction-free energy for the transformation of ^(*)COO^(−) to ^(*)COOH,the potential determining step,which greatly boosts CO_(2)conversion *** work opens the way to realizing economic and efficient CO_(2)electrolysis of group II metals.

关键词： CO_(2)reduction electrocatalysis CO MgO ionic liquid oxygen-vacancy

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