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A luminescent probe for highly selective Cu2+ sensing using a lanthanide-doped metal organic framework with large pores
摘要： Metal-organic frameworks (MOFs) are a class of porous coordination polymer. Recently, some studies have been focused on the detection of various analytes using luminescent MOFs. In this study, an MOF, Eu@1, is synthesized using ([Zn3(TAPB)2(CH3OH)2]) (1) as a precursor to encapsulate Eu3+. It has large pores and excellent luminescent properties, and the quantum yield is up to 30.2%, which can be used as a luminescent probe for highly selective Cu2+ sensing. It is simple and intuitive to use a lanthanide-doped MOF for highly sensitive sensing of Cu2+ by the change of emitting color (from red to blue). The inductively coupled plasma (ICP) and X-ray photoelectron spectroscopy (XPS) data indicate that Cu2+ can easily be exchanged with Eu3+ in 1D channels and replace a portion of the central ions. The good luminescent properties and visible color detectable to the naked eye demonstrate the potential application of this probe in colorimetric detection.
关键词： ions exchange,metal organic framework,large pores materials,luminescence,colorimetric sensor
更新于2025-09-23 15:21:01
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A facile hydrothemal synthesis of MoS2@Co3S4 composites based on metal organic framework compounds as a high-efficiency liquid-state solar cell counter electrode
摘要： A hollow Co3S4 polyhedral loads MoS2 nanosheet composite MoS2@Co3S4-0.5 is prepared by hydrothermal method using Co-based metal organic framework material ZIF-67 as precursor. Hollow Co3S4 polyhedron and uniformly distributed MoS2 nanosheet structure can not only prevent MoS2 aggregation, but also increase the specific surface area of the material and expose more catalytically active sites. The composites afford a promising synergistic effect on the catalyzing of triiodide reduction. As a counter electrode material applied to dye-sensitized solar cells, MoS2@Co3S4-0.5 exhibits excellent catalytic activity, achieving a photoelectric conversion efficiency of 7.86%, which is superior to 6.99% of Pt counter electrode performance in dye-sensitized solar cells. This indicates that MoS2@Co3S4-0.5 composite material can be used to replace precious metal Pt as an efficient and low-cost counter electrode material in dye-sensitized solar cells.
关键词： metal-organic framework,facile hydrothemal synthesis,transition metal sulfide,dye-sensitized solar cells,counter electrode
更新于2025-09-23 15:19:57
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Transformation of a liquid electrolyte to a gel inside dye sensitized solar cells for better stability and performance
摘要： A gel electrolyte based on a metal-organic framework (MOF), comprised of Al3+ and trimesic acid, was used in dye-sensitized solar cells. The electrolyte was gelated inside the solar cell to ensure the best interfacial connection between the TiO2 photoanode and electrolyte ingredients. The photovoltaic performance of the solar cells showed that the gel has a good ability to preserve the function of liquid electrolytes. By optimizing the ratio of MOF and liquid electrolyte, the current density was improved, which was due to the increase in the redox couple I-/I3- content in the gel electrolyte. The open-circuit voltage was affected because of the change in the conduction band of TiO2 by the introduction of Al3+ ions and also because of electron recombination. Thus, a slightly higher efficiency was achieved using the gel electrolyte compared to the liquid electrolyte based cells. A superior stability was achieved with the MOF gel electrolyte under thermal stress at 60 °C for 250 h, while the efficiency of cells with liquid electrolyte deteriorated continuously under the same conditions. The drop in efficiency in the liquid electrolyte cells, was 24%, compared to only a 6% drop in the MOF gel electrolyte cells.
关键词： Stability,Metal organic framework,Dye sensitized solar cells,Thermal stress,Gel electrolyte
更新于2025-09-23 15:19:57
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Controlled dye release from a metala??organic framework: a new luminescent sensor for water
摘要： By introducing the dye Rhodamine 6G (R6G) into a metal–organic framework (MOF), Mn-sdc-2 (H2sdc ? 4,40-stilbenedicarboxylic acid), with a pore size of 20 (cid:2) 9.8 (cid:1)A2, the composite R6G@Mn-sdc-2 was obtained. Subsequently, the MOF Mn-sdc-1 with a smaller pore size of 7.5 (cid:2) 7.5 (cid:1)A2 can be formed through a single-crystal to single-crystal transformation from Mn-sdc-2, thus tightly locking the dye R6G within the pores. Compared with R6G@Mn-sdc-2, R6G@Mn-sdc-1 exhibits a stronger ?uorescence emission of R6G. Because the MOF Mn-sdc-1 can reversibly transform back to Mn-sdc-2 in the presence of trace water, the dye R6G can be released. This enables R6G@Mn-sdc-1 to be used as a new luminescent sensor for trace water in organic solvents by monitoring the ?uorescence intensity of released R6G. The limit of detection can reach 0.035% in ethanol (v : v), which is among the most sensitive ?uorescent water probes.
关键词： fluorescence,metal–organic framework,luminescent sensor,water detection,Rhodamine 6G
更新于2025-09-23 15:19:57
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Neara??Infrareda??toa??Visible Photon Upconversion by Introducing an Sa??T Absorption Sensitizer into a Metala??Organic Framework
摘要： Triplet-triplet annihilation-based photon upconversion (TTA-UC) of near-infrared (NIR) light to visible light in the solid-state remains as a great challenge due to the sensitizer aggregation that impedes the efficient triplet energy transfer. Herein, we successfully introduce a molecular sensitizer exhibiting direct singlet-to-triplet (S–T) absorption into a new emitter-based metal-organic framework (MOF) to achieve an efficient triplet sensitization and a NIR-to-visible TTA-UC in the solid-state.
关键词： photon upconversion,near-infrared light,metal-organic framework,singlet-to-triplet absorption,triplet-triplet annihilation
更新于2025-09-23 15:19:57
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Pure Metal-Organic Framework Microlasers with Controlled Cavity Shapes
摘要： Metal-organic frameworks (MOF) are an emerging kind of laser material, yet remains a challenge in the controlled fabrication of crystal nanostructures with desired morphology for tuning their optical microcavities. Herein, the shape-engineering of pure MOF microlasers was demonstrated based on the coordination mode-tailored method. The one-dimensional (1D) microwires and 2D microplates were selectively fabricated through changing the HCl concentration to tailor the coordination modes. Both the single-crystalline microwires and microplates with strong optical confinement functioned as low-threshold MOF microlasers. Moreover, distinct lasing behaviors of 1D and 2D MOF microcrystals confirm a typical shape-dependent microcavity effect: 1D microwires serve as Fabry-Pérot (FP) resonators, and 2D microplates lead to the whispering-gallery-mode (WGM) microcavities. These results provide a special pathway for the exploitation of MOF-based micro/nanolasers with on-demand functions.
关键词： metal-organic framework,microcavity effect,microlasers,nanophotonics
更新于2025-09-23 15:19:57
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Highly sensitive and recyclable sensing of Fe3+ ions based on a luminescent anionic [Cd(DMIPA)]2- framework with exposed thioether group in the snowflake-like channels
摘要： An interesting chemically stable metal-organic framework, {(NC2H8)2[Cd(DMIPA)]·xG}n (G=guest molecules of H2O and DMA, DMA= N,N-Dimethylacetamide) (1), featuring a 4-connected uninodal {42.64} topology and 18 ? × 18 ? snow?ake-like channels along the c axis with exposed thioether groups, was assembled by employing a tetratopic polycarboxylate ligand of 5,5?-thiobisophthalic acid (H4DMIPA). Ligand-based photoluminescence and solvent-dependent ?uorescent intensities were exhibited in compound 1. Most strikingly, it showed remarkable sensitivity and selectivity toward Fe3+ ions under the presence of other metal ions. The photoluminescence quenching could be detected at a very low concentration of 1.62 ppm, and the maximum quenching e?ciency was found to be 97.2% at 0.175 mM. Signi?cantly, compound 1 can be recycled after use. The ?uorescence intensity and quenching percentage of 1 exhibited very little changes after being used for ten successive cycles (I0 = 6349–6093, and QP = 95.4–96.2%), indicating that 1 is a very promising MOFs-based sensor with remarkable sensitivity, selectivity, and reusability towards Fe3+ ions.
关键词： Metal-organic framework,–S– bridge,Fluorescence sensor,Fe3+ sensing
更新于2025-09-23 15:19:57
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A mixed valence Tb(III)/Tb(IV) metal-organic framework: Crystal structure, luminescence property and selective detection of naproxen
摘要： A mixed valence terbium metal-organic framework (MOF), [Tb2(HCOO)(clhex)·2H2O)]·2H2O (BUC-68) was obtained from the reaction of 1,2,3,4,5,6-cyclohexanehexacarboxylic acid (H6clhex), formic acid, N,N-dimethylformamide (DMF) and the terbium salt under hydrothermal condition at 140 ℃. The crystallographic analysis revealed that the three-dimensional BUC-68 is composed of two-dimensional [Tb2(clhex)·2H2O)] sheets linked by formic ligand. X-ray photoelectron spectra (XPS) analysis revealed that there were terbium (III) and terbium (IV) presented in BUC-68. Thermogravimetric analysis (TGA) indicated that BUC-68 was stable up to 350 ℃. Photoluminescent measurement showed that BUC-68 displays strong luminescence emission, which was arose from efficient ligand to metal energy transfer transitions. Finally, BUC-68 was utilized to conduct selective detect of naproxen (NPX) and some small organic molecules.
关键词： naproxen,Metal-organic framework,selective detection,luminescence sensor,mixed valence
更新于2025-09-23 15:19:57
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Smart yolk/Shell ZIF-67@POM Hybrids as Efficient Electrocatalysts for the Oxygen Evolution Reaction
摘要： The purpose of this research is to develop an effective and inexpensive oxygen evolution reaction (OER) electrocatalysts to achieve high-efficiency water decomposition. Herein, Keggin-type polyoxometalate (POM) nanoparticles coated with zeolitic imidazolate framework (ZIF-67) are successfully synthesized by facile methods. An efficient ZIF-67@POM catalyst with yolk/shell structure is reported. The POM nanomaterials are uniformly dispersed in the surface of ZIF-67. This unique yolk/shell structure with potential synergistic interaction between POM and ZIF-67 result in superior electrocatalytic activity in OER. When the current density is 10 mA cm-2, the overpotential is only 287 mV, and the Tafel slope is 58 mV per decade. Moreover, the as-prepared yolk/shell ZIF-67@POM catalysts exhibit excellent cycling stability, high surface area, abundant surface active sites and high diffusion efficiency comparable to the traditional noble-metal-free OER electrocatalyst.
关键词： polyoxometalate,metal-organic framework,electrocatalysis,oxygen evolution reaction
更新于2025-09-19 17:15:36
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Optimizing luminescence sensitivity and moisture stability of porous coordination frameworks by varying ligand side groups
摘要： Hydrophobic ethyl, butyl or hexyl groups were introduced into the dicarboxylate ligand in the fluorescent porous coordination framework [Zn2(fda)2(bpy)] (LMOF-202, H2fda=9H-fluorene-2,7-dicarboxylic acid, bpy=4,4′-bipyridine) for improving water stability and tuning oxygen sensitivity. The long hexyl groups gave satisfactory water stability but its oxygen sensitivity is low (70.8% fluorescence quenched at 1 bar O2 (1 bar=105 Pa)). In contrast, the shorter side groups gave high oxygen sensitivity (93.9% fluorescence quenched at 1 bar O2) and low water stability. The derivation of the Stern-Volmer curves of the O2 luminescence quenching data from the linear form can be used for detecting trace impurities in the luminescent framework, being much more sensitive than conventional methods such as powder X-ray diffraction. Mixing the ethyl and hexyl groups in the solid-solution manner brought high oxygen sensitivity (96.4% fluorescence quenched at 1 bar O2) and high water stability simultaneously in the same coordination framework.
关键词： metal-organic framework,water stability,oxygen fluorescence sensor
更新于2025-09-19 17:15:36