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Anion-Substituted Garnets Ca3Mn2 – x(Ni, Co)xVyGe3 – yO12 (x = 0, 1; y = 0, 1, 2): Preparation and Characterization
摘要： Garnets with the structure similar to that of Ca3Mn2Ge3O12 have been prepared with simultaneous substitutions of Ge4+ by V5+ in tetrahedra and of Mn3+ by Ni2+ or Co2+ in octahedra. X-ray photoelectron spectroscopy (XPS) proved the absence of V4+ in tetrahedra of the lattice of the compounds prepared and determined the valences of elements in octahedral sites. The increasing d-cation size in octahedra is accompanied by an increase in unit cell volume regardless of the composition of tetrahedra (VyGe3 – y)O12. The electrical conductivity of Ca3Mn2 – x(Ni, Co)xVyGe3 – yO12 (x = 0, 1; y = 0, 1, 2) garnet ceramic samples and the calculated bandgap widths make it possible to classify them with medium-gap semiconductors.
关键词： garnet,crystallographic radius,tetrahedron,electrical conductivity,octahedron,bandgap width,d elements
更新于2025-09-23 15:21:01
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Dual-Wavelength Electrochemiluminescence Ratiometric Biosensor for NF-?oB p50 Detection with Dimethylthiodiaminoterephthalate Fluorophore and Self-Assembled DNA Tetrahedron Nanostructures Probe
摘要： Here, we have fabricated a dual-wavelength electrochemiluminescence ratiometric biosensor based on electrochemiluminescent resonance energy transfer (ECL-RET). In this biosensor, Au nanoparticle-loaded graphitic phase carbon nitride (Au-g-C3N4) as donor, and Au-modified dimethylthiodiaminoterephthalate (TAT) analogue (Au@TAT) as acceptor are investigated for the first time. Besides, tetrahedron DNA probe is immobilized onto Au-g-C3N4 to improve the binding efficiency of transcription factor and ECL ratiometric changes on the basis of the ratio of ECL intensity of 595 nm and 460 nm are obtained through the formation of sandwich structure of DNA probe-antigen-antibody. Our biosensor achieves the assay of NF-κB p50 with a detection limit of 5.8 pM as well as high stability and specificity.
关键词： NF-κB p50,Dimethylthiodiaminoterephthalate (TAT),DNA tetrahedron nanostructures,electrochemiluminescence,ratiometric biosensor
更新于2025-09-23 15:19:57
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Facile synthesis of Ag Bi25GaO39Bi2WO6 heterostructure with enhanced photocatalytic performance based on interface structure design
摘要： Composite photocatalytic system based on interface structure design is deemed to be a feasible method to improve the photocatalytic efficiency of sillenite-type photocatalytic material. Therefore, we reported the successful construction of novel tetrahedron-like Ag–Bi25GaO39–Bi2WO6 heterostructure through a partial chemical conversion strategy coupling with the photo-reduction method. Experiment indicated that the as-prepared Ag–Bi25GaO39–Bi2WO6 heterogeneous structure possessed excellent photo-degradation activity for the decomposition of Rhodamine B (RhB) and 95% of RhB molecules could be decomposed after 20 min of UV–vis light irradiation by comparison of single Bi25GaO39 and Bi2WO6, as well as the Bi25GaO39–Bi2WO6 heterostructure. Moreover, the resulted Ag–Bi25GaO39–Bi2WO6 product also exhibited outstanding photocatalytic activity for the decomposition of other pollutant such as phenol and toxic Cr(VI) solutions. Due to the resulted advantages derived from the rational design of interface structure (matching band structure, intimate interfacial contacts, 'face-to-face' contact mode of hetero-interface and the famous 'schottky barriers'), the photo-generated charges generated in the composite photocatalytic system could be separated quickly, thus exhibiting excellent photocatalytic ability. This design concept can provide new ideas for the construction of other similar composite photocatalytic systems.
关键词： Sillenite,Tetrahedron,Interface structure design,Photocatalysis
更新于2025-09-19 17:15:36
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The UV Plasmonic Behavior of Rhodium Tetrahedrons—A Numerical Analysis
摘要： Rhodium (Rh) nanoparticles have attracted a lot of attention due to their strong and ambient-stable UV plasmonic response. Very recently, the synthesis of Rh tetrahedra with and without concave defect-rich surfaces serving in plasmon assisted photocatalytic energy conversion has been reported. In this work, we perform a systematic numerical study on plasmonic behavior and surface charge distribution in order to optimize the use of Rh tetrahedra in surface-enhanced spectroscopies and photocatalysis. We analyze the effect of the edges and corners reshaping, a deformation already reported to appear in Rh nanocubes which have been repeatedly re-used in photocatalytic processes. It is demonstrated that rounding the edges and corners weakens both the near-field enhancement and surface charge densities in these locations, which in turn are the more reactive regions due to the presence of uncoordinated sites. In addition, we study how the near-field and charge density is redistributed on the surface of the tetrahedra when concavities of different sizes and depths are introduced. Through this study, we show that, in order to simultaneously maximize the near-field enhancement and surface charge densities in the concavity and at external edges and corners, medium size deep concavities are needed.
关键词： rhodium,photocatalysis,nanoparticles,UV plasmonics,tetrahedron
更新于2025-09-12 10:27:22
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Visualizing Kinetically Robust Co <sup>III</sup><sub/>4</sub> L <sub/>6</sub> Assemblies <i>In Vivo</i> : SPECT Imaging of the Encapsulated [ <sup>99m</sup> Tc]TcO <sub/>4</sub><sup>?</sup> Anion
摘要： Non-covalent encapsulation is an attractive approach for modifying the efficacy and physiochemical properties of both therapeutic and diagnostic species. Abiotic self-assembled constructs have shown promise, yet many hurdles between in vitro and (pre)clinical studies remain, not least the challenges associated with maintaining the macromolecular, hollow structure under non-equilibrium conditions. Using a kinetically robust CoIII4L6 tetrahedron we now show the feasibility of encapsulating the most widely used precursor in clinical nuclear diagnostic imaging, the gamma emitting [99mTc]TcO4? anion, under conditions compatible with in vivo administration. Subsequent SPECT imaging of the caged-anion reveals a marked change in the biodistribution compared to the thyroid-accumulating free oxo-anion, thus moving clinical applications of (metallo)supramolecular species a step closer.
关键词： SPECT imaging,biodistribution,clinical applications,CoIII4L6 tetrahedron,Non-covalent encapsulation
更新于2025-09-09 09:28:46