Oriented Covalent Organic Framework Film Synthesis from Azomethine Compounds

Article Chemistry, Physical

Divergent Properties in Structural Isomers of Triphenylamine-Based Covalent Organic Frameworks

Ly D. Tran et al.

Summary: Covalent organic frameworks (COFs) are a type of crystalline, porous materials that can be synthesized in a predictable manner. This study compares two COFs and investigates how structural changes can affect their properties.

CHEMISTRY OF MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Oriented Growth of Thin Films of Covalent Organic Frameworks with Large Single-Crystalline Domains on the Water Surface

Zhaowei Ou et al.

Summary: This study presents a general strategy for the creation of 2D crystals of covalent organic frameworks (COFs) on the water surface, assisted by a charged polymer. Thin films of 2D COFs with large single-crystalline domains have been achieved, and key factors in the formation of larger single-crystalline domains are revealed. The synthesis method shows a high level of generality and has potential for further investigation and applications in electronics.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Dual Nanomechanics in Anisotropic Porous Covalent Organic Framework Janus-Type Thin Films

Shibani Mohata et al.

Summary: Utilizing graphene as a grafting layer, a new method for preparing Janus-type COF-graphene thin films was proposed, demonstrating the fabrication of two distinct Janus-type films with heterogeneous surface morphologies and porosity.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Multidisciplinary Sciences

Steering CO2 hydrogenation toward C-C coupling to hydrocarbons using porous organic polymer/metal interfaces

Chengshuang Zhou et al.

Summary: The conversion of CO2 into fuels and chemicals is an important option for reducing emissions, and controlling the selectivity of C-C coupling on a supported Ru/TiO2 catalyst can significantly enhance C2+ production turnover frequency.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2022)

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Article Materials Science, Multidisciplinary

Highly Crystalline, Free-Standing Covalent Organic Framework Films Produced Directly from Monomer Solutions

Morgan G. Barnes et al.

Summary: A scalable method for casting imine-based COF films directly from a solution of monomers in trifluoroacetic acid and water is reported. By controlling the initial film formation and heating the films in ethanol with residual acid, highly crystalline films with large surface areas could be achieved.

ACS APPLIED POLYMER MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Amorphous-to-Crystalline Transformation: General Synthesis of Hollow Structured Covalent Organic Frameworks with High Crystallinity

Zeshan Xiong et al.

Summary: This study reports a versatile and efficient strategy of amorphous-to-crystalline transformation for the fabrication of highly crystalline HCOFs. The approach allows for the control of hollowing process and crystallization process by regulating the dynamic imine exchange reaction. Various HCOFs with ultrahigh surface areas and uniform morphologies were successfully synthesized, and COF-based yolk-shell nanostructures with functional interior cores were also fabricated. The obtained metal@HCOFs catalysts showed enhanced catalytic activity and size-selectivity, highlighting the significance of nucleation-growth kinetics of COFs in tuning their morphologies, structures, and applications.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Multidisciplinary Sciences

Two-dimensional covalent organic framework films prepared on various substrates through vapor induced conversion

Minghui Liu et al.

Summary: This study reports the synthesis of large-area two-dimensional (2D) COF films with controllable thicknesses via vapor-induced conversion. The reversible Schiff base polycondensation reaction results in the formation of a uniform organic framework film directly on the growth substrate. Wafer-scale 2D COF films with different structures have been successfully synthesized by adjusting their building blocks.

NATURE COMMUNICATIONS (2022)

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Article Chemistry, Multidisciplinary

In Situ Growth of Covalent Organic Framework Nanosheets on Graphene as the Cathode for Long-Life High-Capacity Lithium-Ion Batteries

Xiaolin Liu et al.

Summary: In this study, a dual-porous COF material with rich redox-active sites and good electronic conductivity was designed and fabricated for use in lithium-ion batteries as electrodes, demonstrating excellent capacity and cycling performance.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Landscaping Covalent Organic Framework Nanomorphologies

Himadri Sekhar Sasmal et al.

Summary: This article reviews the synthetic strategies for controlling the nanomorphologies of covalent organic frameworks (COFs) and examines the impact of dimensionalities on their physicochemical properties and applications. The aim is to improve the performance of COFs in various fields by optimizing their morphological dimensions.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Multidisciplinary Sciences

Assembling covalent organic framework membranes via phase switching for ultrafast molecular transport

Niaz Ali Khan et al.

Summary: The authors propose a two-step phase switching strategy to assemble compact and highly crystalline COF membranes, decoupling the polymerization and crystallization process. The resulting COF membranes exhibit exceptional permeance, making them a promising method for the fabrication of advanced organic crystalline microporous membranes.

NATURE COMMUNICATIONS (2022)

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Article Nanoscience & Nanotechnology

Microwave Facilitated Covalent Organic Framework/Transition Metal Dichalcogenide Heterostructures

Lucas K. Beagle et al.

Summary: This study demonstrates a microwave facilitated synthesis process to attach few-layer covalent organic framework (COF) films onto monolayer transition metal dichalcogenides (TMDC). The electronic coupling between TMDC and COF at higher TMDC defect densities results in a shift in the A-exciton peak location of MoSe2.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Chemistry, Physical

Transformation of One-Dimensional Linear Polymers into Two-Dimensional Covalent Organic Frameworks Through Sequential Reversible and Irreversible Chemistries

Dongyang Zhu et al.

Summary: Covalent organic frameworks (COFs) are crystalline porous materials linked by dynamic covalent bonds. This study demonstrates a method to transform linear polymers into COFs through a linker replacement strategy. The analysis of the transformation process and substitution mechanisms provides a potential approach to synthesizing COFs.

CHEMISTRY OF MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Self-Assembly-Driven Nanomechanics in Porous Covalent Organic Framework Thin Films

Kaushik Dey et al.

Summary: This study investigates the mechanical behavior of different types of COF thin films by controlling the internal order and self-assembly of building blocks, revealing that defect density and the nature of supramolecular interactions play a significant role in determining the stress-strain behavior of the films.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Chemistry, Multidisciplinary

Polycrystalline Covalent Organic Framework Films Act as Adsorbents, Not Membranes

Julie L. Fenton et al.

Summary: Covalent organic framework (COF) membranes function as adsorbents rather than size-sieving membranes. Adsorption of various dyes by COFs shows high capacity and diverse affinities, driven by variable entropic gains. Further examination of the COF membrane literature is necessary, as separations based on differential transport through 2D COF pores remain an important yet unrealized frontier.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Chemistry, Applied

Synthesis of nitrogen-containing covalent organic framework with reversible iodine capture capability

Run Chen et al.

Summary: This study explored the crystallization of a stable nitrogen-containing COF for efficient and reversible volatile iodine capture, demonstrating high uptake capacity and recyclability.

MICROPOROUS AND MESOPOROUS MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Chemically Stable Polyarylether-Based Metallophthalocyanine Frameworks with High Carrier Mobilities for Capacitive Energy Storage

Chongqing Yang et al.

Summary: This study reports the synthesis of COFs with efficient charge transport and chemical stability, as well as the growth of thin films on various substrates. The thin films exhibit excellent semiconducting properties and significant increases in conductivity. Additionally, density functional theory calculations reveal the anisotropic nature of carrier transport in the framework.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Chemistry, Multidisciplinary

Crystallizing Sub 10 nm Covalent Organic Framework Thin Films via Interfacial-Residual Concomitance

Ashok Kumar Mahato et al.

Summary: Using the residual crystallization (RC) method along with interfacial crystallization (IC) as a rate-controlling tool, and two different crystallization pathways - fiber-to-film (F-F) and sphere-to-film (S-F), high surface area, crystallinity, and conductivity COF thin films have been successfully synthesized.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Materials Science, Multidisciplinary

Synthesis and tailored properties of covalent organic framework thin films and heterostructures

Lucas K. Beagle et al.

Summary: This review highlights recent progress in the synthesis, customization of properties, and integration with other materials of porous polymeric covalent organic frameworks (COFs) thin films, showcasing their potential applications in filtration, electronics, sensors, and electrochemistry.

MATERIALS TODAY (2021)

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Article Polymer Science

Quantifying alignment in carbon nanotube yarns and similar two-dimensional anisotropic systems

Adarsh Kaniyoor et al.

Summary: This study examines the measurement of uniaxial orientational order in macromolecular systems and demonstrates the applicability of Chebyshev polynomials for analyzing orientation in two-dimensional materials. Additionally, a method for rapidly estimating the orientation parameter from a sample's 2D Fourier power spectrum using an analysis program written in Python is presented.

JOURNAL OF APPLIED POLYMER SCIENCE (2021)

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Article Chemistry, Multidisciplinary

Fast-Switching Vis-IR Electrochromic Covalent Organic Frameworks

Derya Bessinger et al.

Summary: Electrochromic thin films based on covalent organic frameworks (COFs) exhibit high coloration efficiency and fast switching speeds, with reversible absorption changes of close to 3 OD triggered at low operating voltages and low charge per unit area. The champion material reaches a coloration efficiency of 858 cm(2) C-1 at 880 nm and maintains >95% of its response over 100 oxidation/reduction cycles, with extremely fast response times below 0.4 seconds for oxidation and around 0.2 seconds for reduction.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Chemistry, Multidisciplinary

Scalable Fabrication of Crystalline COF Membranes from Amorphous Polymeric Membranes

Chunyang Fan et al.

Summary: The transformation from amorphous polymeric membrane to crystalline COF membrane via monomer exchange allows for improved proton conductivity. The addition of intramolecular hydrogen bonds helps the crystalline COF maintain the morphology of the amorphous membrane.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary