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- Hanyang University
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Organic transistor nonvolatile memory with an integrated molecular floating-gate/tunneling layer
摘要： Floating-gate based organic ?eld-effect transistor (FG-OFET) nonvolatile memories (NVMs) are demonstrated based on an integrated molecular ?oating-gate/tunneling layer, in which small molecular fullerene (C60) acting as the ?oating-gate and long-chain alkane molecule tetratetracontane acting as the tunneling layer are synchronously prepared by vacuum thermal evaporation. The effects of the thickness and the component of the integrated ?oating-gate/tunneling layer on the performances of memory are investigated. As a result, a high performance FG-OFET NVM is achieved, with a large memory window of 8.0 V on average, stable retention capability over 10 years, and reliable switching endurance over 100 cycles at the programming/erasing voltages of 640 V, at an optimized condition.
关键词： organic transistor,nonvolatile memory,fullerene,tunneling layer,molecular floating-gate,tetratetracontane
更新于2025-09-04 15:30:14
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Low‐dimensional hybrid perovskites containing an organic cation with an extended conjugated system: tuning the excitonic absorption features
摘要： Low-dimensional hybrid perovskites are receiving increased attention. One of the advantages of the low dimensional hybrids over their 3D counterparts is their greater structural flexibility towards the incorporation of bigger, more complex, organic cations. In this communication, we introduce a pyrene derivative as an organic cation containing an extended π-system for use in a variety of low dimensional hybrids. We show that materials with different excitonic absorption features can be obtained by tuning the iodide/lead ratio in the precursor solutions, using the same pyrene cation. In this way, hybrids with optical characteristics corresponding to 2D, 1D and 0D hybrid perovskites are obtained. The formation and thermal stability of the different hybrids is analysed and compared.
关键词： excitons,stability,organic-inorganic hybrid composites,low-dimensional,perovskite phases
更新于2025-09-04 15:30:14
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Bimetallic metal organic frameworks: Magnetically separable heterogeneous catalyst for efficient organic transformation and photocatalytic dye degradation
摘要： A new bimetallic MOF (BMOF) has been synthesized using iron and zinc as inorganic metal nodes and 1-4, benzenedicarboxylic acid (BDC) as organic linker molecule. BMOF was confirmed with Single crystal X-ray diffraction (SCXRD), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy-high angle annular dark-field imaging (TEM-HAADF), Field emission scanning electron microscopy-energy dispersive x-ray analysis (FESEM-EDX), Vibrating sample magnetometer (VSM) and inductively coupled plasma-mass spectrometry (ICP-MS) analysis. The synthesized BMOF shows excellent optical and magnetic properties. BMOF acts as a heterogeneous catalyst and show high catalytic activity towards bis(indolyl)methane synthesis and photocatalytic degradation of methylene blue (MB) under visible light illumination.
关键词： Metal-organic frameworks,dye degradation,Bis(indolyl)methanes,photocatalysis
更新于2025-09-04 15:30:14
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A Diamine Silver(I) Carbonate: Ammonium Formate: Polyol-Based Water Soluble Ink for Inkjet Printing of Conductive Patterns
摘要： Electron devices are components used in ICT where information is encoded in the electronic charge channel. Among them, those manufactured through digital printing, benefited from a tremendous research effort the creation of a palette of functionalities provided by solution processed materials, to achieve dielectric, metallic and semiconductive behavior. The degree of metallicity of available printable inks very seldom goes below the threshold of 200 mΩ/□ which is fundamental for the fabrication of high quality conductors. Here we describe the formulation of a ink, based on Diamine Silver(I) Carbonate, Ammonium Formate and Polyols, providing several physicochemical characterizations and describing the process leading to sheet resistance below 200 mΩ/□ after a annealing at 120 °C for 5 minutes.
关键词： annealing,inkjet printing,metal pattern,Ag,metal-organic
更新于2025-09-04 15:30:14
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Hybridization of an unoccupied molecular orbital with an image potential state at a lead phthalocyanine/graphite interface
摘要： The interaction of a molecular orbital with a surface state is important to understand the spatial distribution of the wave function at the molecule/substrate interface. In this study, we focus on hybridization of an unoccupied state of lead phthalocyanine (PbPc) with the image potential state (IPS) on a graphite surface. The hybridization modifies the energy-momentum dispersions of the IPS on PbPc films as observed by angle-resolved two-photon photoemission. On the PbPc 1 monolayer film, the IPS band forms a band gap and back-folding appears at the first Brillouin zone boundary due to the periodic potential by the adsorbate lattice. The modification of the dispersion is accompanied by the intensity enhancement of the IPS. We attributed the origin of the modified dispersion and intensity enhancement to a hybridization of the IPS with a molecule-derived unoccupied level. From the photon energy-dependent measurement on multilayer films, we have found the diffuse unoccupied molecular level in the vicinity of the IPS. The tail part of the IPS wave function in the substrate is enhanced by the hybridization with the unoccupied state, and thus strengthens the transition from the occupied substrate band to the hybridized IPS.
关键词： organic ultrathin films,image potential states,two-photon photoemission spectroscopy,unoccupied states,hybridization
更新于2025-09-04 15:30:14
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Bismuth(III) based Metal Organic Frameworks: Luminescence, Gas Adsorption, and Antibacterial Studies
摘要： BiIII-MOFs 1–4 were prepared via solvothermal method using four organic linkers; 2-mercapto-3-methyl-4-thiazoleacetic acid (H2MMTA), 2,6-naphthalenedicarboxylic acid (2,6-NDA), 4,6-dihydroxy-2-mercaptopyrimidine (H2DMP), and 4-mercaptobenzoic acid (H2MBA), respectively. The resulting MOFs were structurally/morphologically characterized by UV/Vis, AAS/ICP-MS, Fourier transform infrared spectroscopy (FT-IR), 1H NMR, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and powder X-ray diffraction technique. All these MOFs showed good luminescence properties exhibiting blue luminescence. N2 gas adsorption isotherms of 1–4 confirmed the porosity of these frameworks. In order to evaluate the effect of metal ion upon chelation, the free organic linkers and respective MOFs were screened for their antibacterial potential against some pathogenic bacteria and appreciable activity was observed.
关键词： Metal organic frameworks,Luminescence,Bismuth,Bidentate ligands
更新于2025-09-04 15:30:14
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Synthesis of graphene by in situ catalytic chemical vapor deposition of reed as a carbon source for VOC adsorption
摘要： Few-layer graphene was synthesized by in situ catalytic carbon vapor deposition (CCVD) method, using reed as a carbon source and Ni, Cu, and Mg salts as the catalyst compounds. The synthesized graphene was also used for adsorption of VOCs. Furthermore, the effect of organic additives, sorbitol, and citric acid on catalyst compounds was investigated by temperature-programmed reduction analysis (H2-TPR). The products’ properties were characterized by thermo-gravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and Brunauer–Emmett–Teller (BET) surface area analysis. TEM and FE-SEM images confirmed the formation of graphene sheets. Activation of the graphene by phosphoric acid at 500 °C and then by CO2 at 800 °C increased the surface area from 298 to 568 m2/g. Gasoline working capacity of the activated graphene was 65.24 g/ladsorbent.
关键词： Volatile organic compounds,Catalytic carbon vapor deposition,Graphene,Reed,Adsorption
更新于2025-09-04 15:30:14
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Interface-induced enhanced electromagnetic wave absorption property of metal-organic frameworks wrapped by graphene sheets
摘要： Most of metal–organic frameworks (MOFs) themselves have low electrical conductivities, leading to bad electromagnetic wave (EMW) absorption properties. Herein we found that the EMW absorption property of zeolitic imidazolate frameworks-8 (ZIF-8) particles was improved unexpectedly after coupling them with graphene sheets. Experimental results and theoretical calculations indicated that well-defined interfaces between ZIF-8 and the graphene sheets were crucial to the improvement of EMW absorption property. Our strategy presented here may open a new way for designing other MOFs based hybrids for high-performance EMW absorbers.
关键词： Porous structure,Graphene-organics composites,Metal–organic frameworks,Electromagnetic wave absorption,Multiple interfaces
更新于2025-09-04 15:30:14
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Restriction of Molecular Rotors in Ultrathin Two-Dimensional Covalent Organic Framework Nanosheets for Sensing Signal Amplification
摘要： Covalent organic frameworks (COFs) have emerged as promising crystalline porous materials with well-defined structures, high porosity, tunable topology and functionalities suitable for various applications. However, studies of few-layered ultrathin two-dimensional (2D) COF nanosheets, which may lead to unprecedented properties and applications, are still limited. Herein we report the targeted synthesis of three azine-linked and imine-linked 2D COFs named NUS 30-32 using monomers containing aggregation-induced emission (AIE) rotor-active tetraphenylethylene (TPE) moieties, affording micro- and meso- dual pores in NUS-30 and NUS-32, and triple pores in NUS-31. For the first time, we demonstrate that these isostructural bulk COF powders can be exfoliated into ultrathin 2D nanosheets (2 – 4 nm thickness) by temperature-swing gas exfoliation approach. Compared with TPE monomers and COF model compounds, the AIE characteristic of NUS 30-32 nanosheets is distinctly suppressed due to the covalent restriction of the AIE molecular rotors in the confined 2D frameworks. As a result, the enhancement of conjugated conformations of NUS 30-32 nanosheets with unusual structure relaxation show signal amplification effect in biomolecular recognition of amino acids and small pharmaceutical molecules (L-dopa), exhibiting much higher sensitivity than their stacked bulk powders, TPE monomer, and COF model compound. Moreover, the binding affinity of the COF nanosheets toward amino acids can be controlled by increasing the number of azine moieties in the structure. Density functional theory (DFT) calculations reveal that binding affinity control results from the crucial geometric roles and stronger host-guest binding between azine moieties and amino acids. In addition, we demonstrate that minimal loading of the NUS-30 nanosheets in composite membranes can afford excellent performance for biomolecule detection. Our findings pave a way for the development of functional ultrathin 2D COF nanosheets with precise control over the nature, density, and arrangement of the binding active sites involved in enhanced molecule recognition.
关键词： molecular rotors,Covalent organic frameworks,aggregation-induced emission,biomolecular recognition,signal amplification,two-dimensional nanosheets
更新于2025-09-04 15:30:14
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End-cap Group Engineering of a Small Molecule Non-Fullerene Acceptor: The Influence of Benzothiophene Dioxide
摘要： In this study, a sulfonyl-containing end-capping moiety, benzothiophene dioxide, was selected to prepare the nonfullerene acceptor ITBC. ITBC has an acceptor?donor?acceptor (A-D-A) structure, with indacenodithieno[3,2-b]thiophene (IDTT) as the electron-rich core moiety. The strong electron-withdrawing sulfonyl acceptor units leads to extended UV?vis absorption into the near-IR region and relatively low frontier molecular orbital energy levels (LUMO/HOMO: ?4.13 eV/?5.61 eV) with a narrow bandgap of 1.48 eV. These values compare favorably to the well-studied small molecule acceptor 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end-capped indacenodithieno[3,2-b]thiophene (ITIC). A power conversion e?ciency of 4.17% was achieved by fabricating organic solar cells with the ?uorinated conjugated polymer FTAZ as the donor and ITBC as the acceptor. These results indicate that benzothiophene dioxide is a novel electron-withdrawing end-capping unit for ITBC, and can be used as an electron acceptor for organic solar cells.
关键词： fused conjugated system,non-fullerene acceptor,e?cient photovoltaics,benzothiophene dioxide,organic solar cells
更新于2025-09-04 15:30:14