Construction of ultra-stable magnetic imine-cyclization covalent organic frameworks for efficient extraction of phenylurea herbicides in plant beverages.

Imine-linked covalent organic frameworks (COFs) are considered as promising adsorbents to remove the water contaminants. However, the reversibility and hydrolyzation of imine bond may generate limited stability in long-term aqueous environment-based applications, and the improved stability of imine-linked COFs is highly desired. In this work, a carboxyl-quinoline linked COFs (CQ-COF) was synthesized by the cyclization of imine linkage via one-step modification.

Opto/Catalytic Metal-Organic Framework Adjuvant-Empowered Acidolytic Nanozymes Amplified for Bimodal Glycoprotein Assay.

In this work, an adaptive fusion strategy of acidolytic nanozyme-based sandwich immunoreaction and metal-organic framework (MOF) adjuvants was developed for the inspired establishment of an enhanced glycoprotein assay, in which MOFs can function as dual-signal opto/catalytic adjuvants. The specific means toward the glycoprotein recognition pattern were guaranteed by both antigen recognition as well as glycosylated epitope binding through lectin affinity, and the immediate responses were initiated by textural acidolysis of the typical FeO nanozymes for signal generation. Upon the solid FeO particles being subjected to acidolytic decomposition, the signal generators can be harvested in an on-demand manner.

In-situ growth of olefin-linked covalent organic framework nanofiber membranes via surface-mediated condensation for sustainable removal of bisphenol A.

Developing multifunctional adsorbents with exceptional capture performance and outstanding stability is significant for pollutant removal. Olefin-linked sp² carbon-conjugated covalent organic frameworks (sp²c-COFs) exhibit high chemical stability and robust framework properties. This work developed a facile in-situ growth strategy to synthesize sp²c-COF films on polyacrylonitrile (PAN) nanofibers via aldol condensation.

Boronic acid functionalized hierarchical covalent organic frameworks based on sacrificial template and thiol-ene click chemistry for the enhanced enrichment of glycoproteins.

Glycoproteins are closely related to the formation and development of many diseases and even cancer, it is necessary to design and develop a method for efficient isolation and enrichment of glycoproteins in biomedical sciences, and in particular biomarker research. In this work, a strategy has been developed for the synthesis of phenylboronic acid-modified hierarchical covalent organic frameworks (COFs), which were applied to selective enrichment of glycoproteins from complex biological samples. The metastable metal-organic framework (MOF) was utilized as a sacrificial template to prepare hierarchical COFs (HCOFs) with highly interconnected macro/meso/microprous channels, and subsequently the thiol-ene click chemistry was utilized to obtain 4-mercapto-phenylboronic acid-modified HCOFs.

Super Strong Bonding at the Interface between ETL and Perovskite for Robust Flexible Optoelectronic Devices.

Organic-inorganic hybrid perovskites have demonstrated great potential for flexible optoelectronic devices due to their superior optoelectronic properties and structural flexibility. However, mechanical deformation-induced cracks at the buried interface and delamination from the substrate severely constrain the optoelectronic performance and device lifespan. Here, we design a two-site bonding strategy aiming to reinforce the mechanical stability of the SnO/perovskite interface and perovskite layer using a multifunctional organic salt, 4-(trifluoromethoxy)phenylhydrazine hydrochloride (TPH).

Bioinspired Spatial Compartment of Substrate Molecules and Catalytic Counting Entities in Hierarchical MOFs Initiated for a Dual-Mode Glycoprotein Assay.

Living cell systems possess multiple isolated compartments that can spatially confine complex substances and shield them from each other to allow for feedback reactions. In this work, a bioinspired design of metal-organic frameworks (MOFs) with well-defined multishelled matrices was fabricated as a hierarchical host for multiple guest substances including fluorogenic molecules and catalytic nanoparticles (NPs) at the separated locations for the development of a dual-mode glycoprotein assay. The multispatial-compartmental zeolitic imidazolate framework-8 (ZIF-8) constituents were synthesized via epitaxial shell-by-shell overgrowth to guide the integration and spatial organization of host guests.

Rapid Synthesis of Covalent Organic Framework at Room Temperature Incorporated Electrospun Nanofiber for Thin Film Microextraction of Quinolone Antibiotics in Honey and Chicken Samples.

In this work, the covalent organic frameworks-incorporated electrospun nanofiber membranes were used as a highly efficient adsorbent to enrich quinolone antibiotics in food samples. Covalent organic frameworks composed of 1,3,5-tris(4-aminophenyl) benzene and 2,5-dihydroxyterephthalaldehyde were rapid prepared only 20 min at room temperature, then were further synthesized into electrospun polyacrylonitrile nanofiber membranes by electrospinning the binary precursors solution directly. Coupled with high-performance liquid chromatography with ultraviolet detector, the method exhibited good linearity in the range of 1-100 ng·mL for four quinolone antibiotics, with low limits of detection 0.

Recent advances in photonic crystal-based chemical sensors.

The increasing attention towards environmental quality, food safety, public security and medical diagnosis demands high requirements and standards for chemical sensors with merits of rapid response, high precision, long-term stability and reusability. In this case, a prominent innovation in sensory materials holds potential to realize new generations of chemical sensor technologies. Specifically, photonic crystals (PCs) as structured dielectric materials with spatially periodic ordered arrangements offer unique advantages in improving the sensing performance of chemical sensors.

Textural Precursor Compositions Harvested for Independent Signal Generators: Scaling Micron-Sized Flower-Like Metal-Organic Frameworks as Amplifying Units for Dual-Mode Glycoprotein Assay.

In this work, a micron-sized flower-like metal-organic frameworks (MOFs)-based boronate-affinity sandwich-type immunoassay was fabricated for the dual-mode glycoprotein assay. For proof of concept, the flower-like MOFs were synthesized from transition Cu nodes and tetrakis (4-carboxyphenyl) porphyrin (TCPP) ligands by spontaneous standing assembly. In addition, the specificity toward glycoprotein involved the antigen recognition as well as covalent bonding via the boronate-glycan affinity, and the immediate signal responses were initiated by textural decomposition of the flower-like MOFs.

A self-calibrating ratiometric fluorescence sensor with photonic crystal-based signal amplification for the detection of tetracycline in food.

A dual-color ratiometric fluorescence sensor based on photonic crystals (PCs) was developed to detect tetracycline (TC) in food. PC was fabricated via self-assembly of carbon dots (CDs)-loaded SiO nanoparticles. Gold nanoclusters (AuNCs) and copper ions (Cu) were then adsorbed onto the PC for sensor fabrication.

Electrospun Fiber Membrane with the Dual Affinity of Chelation and Covalent Interactions for the Efficient Enrichment of Glycoproteins.

As important biomarkers of many diseases, glycoproteins are of great significance to biomedical science. It is essential to develop efficient glycoprotein enrichment platforms and investigate their adsorption mechanism. In this work, a conspicuous enrichment strategy for glycoproteins was developed by using an electrospun fiber membrane wrapped with polydopamine (PDA) and modified with 3-aminophenylboronic acid and nickel ions, named PAN/DA@PDA@APBA/Ni.

Highly Efficient Solar-Driven Dry Reforming of Methane on a Rh/LaNiO Catalyst through a Light-induced Metal-To-Metal Charge Transfer Process.

As an energy-saving and green method, solar-driven dry reforming of methane (DRM) is expected to introduce new activation processes and prevent sintering and coking of the catalysts. However, it still lacks an efficient way to coordinate the regulation of activation of reactants and lattice oxygen migration. In this study, Rh/LaNiO is designed as a highly efficient photothermal catalyst for solar-driven DRM, which performs production rates of 452.

An aptamer-functionalized photonic crystal sensor for ultrasensitive and label-free detection of aflatoxin B1.

As a novel optical responsive material, photonic crystal is a promising sensing material in the recognition and detection of small molecules. Herein, a label-free composite sensor for aflatoxin B1 (AFB1) based on aptamer-functionalized photonic crystal arrays was successfully developed. Three-dimensional photonic crystals (3D PhCs) with a controllable number of layers were produced by a layer-by-layer (LBL) approach, and the introduction of gold nanoparticles (AuNPs) facilitated the immobilization procedure of recognition element aptamers, thus creating the AFB1 sensing detection system (AFB1-Apt 3D PhCs).

Highly Active Hydrogen-rich Photothermal Reverse Water Gas Shift Reaction on Ni/LaInO Perovskite Catalysts with Near-unity Selectivity.

Photo-assisted reverse water gas shift (RWGS) reaction is regarded green and promising in controlling the reaction gas ratio in Fischer Tropsch synthesis. But it is inclined to produce more byproducts in high H concentration condition. Herein, LaInO loaded with Ni-nanoparticles (Ni NPs) was designed to obtain an efficient photothermal RWGS reaction rate, where LaInO was enriched with oxygen vacancies to roundly adsorbing CO and the strong interaction with Ni NPs endowed the catalysts with powerful H activity.

Construction of Stable Magnetic Vinylene-Linked Covalent Organic Frameworks for Efficient Extraction of Benzimidazole Fungicides.

Covalent organic frameworks (COFs) have attracted impressive interest in separation on aqueous media. Herein, we integrated the stable vinylene-linked COFs with magnetic nanosphere via the monomer-mediated in situ growth strategy to construct a crystalline FeO@v-COF composite for enrichment and determination of benzimidazole fungicides (BZDs) from complex sample matrices. The FeO@v-COF has a crystalline assembly, high surface area, porous character together with a well-defined core-shell structure, and serves as progressive pretreatment materials for magnetic solid phase extraction (MSPE) of BZDs.

An ultrasensitive label-free biosensor based on aptamer functionalized two-dimensional photonic crystal for kanamycin detection in milk.

A novel photonic crystal aptamer biosensor SiO-Au-ssDNA two-dimensional photonic crystal (2D PC), allowing label-free and highly sensitive to kanamycin (KANA), is successfully manufactured. This 2D PC biosensor was prepared via a needle tip flow method, using electrostatic adsorption to introduce negatively charged gold nanoparticles (Au NPs) into the 2D PC, combined with sulfhydryl-modified ssDNA for the rapid measurement. Benefiting from the localized surface plasmon resonance effect of Au NPs and optical response capability of PC, the biosensor has an excellent performance on quantitative analysis of KANA ranging from 5 pg∙mL to 5 μg∙mL, with a limit of detection of 1.

A Highly Selective and Sensitive Fluorescent Sensor Based on Molecularly Imprinted Polymer-Functionalized Mn-Doped ZnS Quantum Dots for Detection of Roxarsone in Feeds.

Roxarsone (ROX) as an organoarsenic feed additive has been widely used in livestock breeding and poultry industry, but ROX can degrade into highly toxic inorganic arsenic species in natural environments to threaten to the environment and human health. Therefore, there is a considerable interest in developing convenient, selective and sensitive methods for the detection of ROX in livestock breeding and poultry industry. In this work, a fluorescent molecularly imprinted polymer (MIPs) probe based on amino-modified Mn-ZnS quantum dots (QDs) has been developed by sol-gel polymerization for specific recognition of ROX.

Construction of magnetic covalent organic frameworks functionalized by benzoboroxole for efficient enrichment of glycoproteins in the physiological environment.

To date, the development of highly selective and efficient glycoproteins/peptides enrichment is still a challenge for mass spectrometry-based proteomic analysis. In this work, we reported a novel strategy to prepare a magnetic amide-linked covalent organic framework functionalized by benzoboroxole (denoted as FeO@COF-ABB), which was then used as an adsorbent for the enrichment of glycoproteins. The physical and adsorption properties of FeO@COF-ABB were fully investigated.

Covalent Organic Framework/Polyacrylonitrile Electrospun Nanofiber for Dispersive Solid-Phase Extraction of Trace Quinolones in Food Samples.

The extraction of quinolone antibiotics (QAs) is crucial for the environment and human health. In this work, polyacrylonitrile (PAN)/covalent organic framework TpPa-1 nanofiber was prepared by an electrospinning technique and used as an adsorbent for dispersive solid-phase extraction (dSPE) of five QAs in the honey and pork. The morphology and structure of the adsorbent were characterized, and the extraction and desorption conditions for the targeted analytes were optimized.

Highly fluorinated magnetic covalent organic framework for efficient adsorption and sensitive detection of microcystin toxin in aqueous samples.

The effective adsorption and sensitive determination of microcystin-LR (MC-LR) are crucial for the environment and human health. In this work, a highly fluorinated magnetic covalent organic framework (denoted as FeO@TabTfa-F) was synthesized through a simple strategy. The morphology and structure of the as-prepared FeO@TabTfa-F were investigated and FeO@TabTfa-F showed that it had a high specific surface area (442.

Near 90% Transparent ITO-Based Flexible Electrode with Double-Sided Antireflection Layers for Highly Efficient Flexible Optoelectronic Devices.

As a widely used substrate for flexible electronics, indium-tin oxide-based polymer electrodes (polymer-ITO electrodes) exhibit poorly visible light transmittance of less than 80%. The inferior transmittance for polymer-ITO electrodes severely limits the performance improvement of polymer-ITO based electronics. Here, a conceptually different approach of the double-sided antireflection coatings (DARCs) strategy is proposed to modulate both the air-polymer substrate interface and ITO-air interface refractive index gradient, to synergistically improve the transmittance of polymer-ITO electrodes.

Multi-stimuli responsive molecularly imprinted nanoparticles with tailorable affinity for modulated specific recognition of human serum albumin.

A kind of novel multi-stimuli responsive molecularly imprinted polymers with bovine serum albumin (BSA) as a dummy template (MSR-BSA-MIPs) was fabricated for specific recognition of human serum albumin (HSA) with modulated affinity. The MSR-BSA-MIPs were prepared through free radical polymerization using vinyl modified magnetic nanoparticles as substrates, bovine serum albumin (BSA), with high amino acid sequence similarity but low price compared to HSA, as the dummy template, -(3-(dimethylamino)-propyl)-methacrylamide (DMAPMA) and -isopropylacrylamide (NIPAm) as functional monomers with ionic strength and temperature response. The conditions of polymerization, adsorption and elution were systematically investigated.

The electrospun polyacrylonitrile/covalent organic framework nanofibers for efficient enrichment of trace sulfonamides residues in food samples.

In this work, the electrospun polyacrylonitrile/covalent organic frameworks Tp-BD nanofibers (PAN/Tp-BD) were synthesized and applied as an adsorbent for thin film microextraction (TFME) of seven sulfonamides in animal derived food samples. The morphology, structure, porosity, and stability of the prepared nanofibers were investigated. The PAN/Tp-BD nanofibers exhibited good chemical stability, high flexibility, porous fibrous structure, and excellent extraction efficiency.

Efficient Extraction and Determination of Carbamate Pesticides in Vegetables Based on a Covalent Organic Frameworks with Acylamide Sites.

It is an important challenge to effectively extract and determine pesticides in complex samples. Covalent organic frameworks (COFs) are burgeoning porous crystalline organic materials with good environmental resistance, thus demonstrating great potential as adsorbents in contaminants detection. In this work, we design and synthesize a novel COF-TpDB via 1,3,5-triformylphloroglucinol (Tp) and 4,4'-diaminobenzoylanilide (DB) as well as its packed cartridge for solid phase extraction (SPE) of carbamate pesticides.

Phosphate group functionalized magnetic metal-organic framework nanocomposite for highly efficient removal of U(VI) from aqueous solution.

The phosphate group functionalized metal-organic frameworks (MOFs) as the adsorbent for removal of U(VI) from aqueous solution still suffer from low adsorption efficiency, due to the low grafting rate of groups into the skeleton structure. Herein, a novel phosphate group functionalized metal-organic framework nanoparticles (denoted as FeO@SiO@UiO-66-TPP NPs) designed and prepared by the chelation between Zr and phytic acid, showing fast adsorption rate and outstanding selectivity in aqueous media including 10 coexisting ions. The FeO@SiO@UiO-66-TPP was properly characterized by TEM, FT-IR, BET, VSM and Zeta potential measurement.