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Cu-Fe-Se Ternary Nanosheet-Based Drug Delivery Carrier for Multimodal Imaging and Combined Chemo-photothermal Therapy of Cancer
摘要： Ternary transition-metal chalcogenide nanosheets have shown great potential in diverse applications owing to their intrinsically amazing properties with broad tunable window. Direct preparation of water-soluble and biocompatible ternary chalcogenide nanosheets for theranostic application remains a challenge. In this article, we prepared Cu-Fe-Se nanosheets (CFS NSs) in an aqueous solution under ambient conditions by sequential coprecipitation method. They were functionalized with anticancer drug doxorubin (CFS@DOX) through electrostatic interactions, and labeled with radioactive isotope 99mTc through surface coordination effect. The resulting nanosheets have a size of 70 nm and a thickness of 5 nm, and can be well dispersed in water, PBS, 10% FBS, and 0.9% NaCl with an excellent colloidal stability. They also exhibit a high photothermal conversion efficiency of 78.9% for in vitro and in vivo photoacoustic imaging and photothermal therapy. The isotope-labelled nanosheets (99mTc-CFS NSs) were used for single photon emission computed tomography/computed tomography (SPECT/CT) imaging, and quantification of their blood circulation time (~4.7 h) and biodistributions in major organs, which follow an order of liver > bladder > lung > spleen > heart > kidney. The DOX functionalized nanosheets (CFS@DOX) were used for chemotherapy of cancer and exhibited excellent anti-cancer efficacy. Our research shows the great promise of ternary metal chalcogenide nanosheets for combined imaging and therapy of cancer.
关键词： radiolabeling,2D ternary nanosheets,transition metal chalcogenides,multimodal imaging,chemotherapy,photothermal therapy
更新于2025-09-11 14:15:04
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Phenomenological description of strain relief in step-graded metamorphic buffer layers based on In x Al1 ? x As ternary solutions
摘要： Spatial distributions of the residual elastic strains in layers of step-graded metamorphic buffers of two different designs, grown via molecular beam epitaxy on the basis of InxAl1 ? xAs ternary solutions, are obtained by means of reciprocal space mapping. It is shown that with allowance for work hardening, which affects strain relief in buffer layers and increases the strain in dislocation-free layers, the mechanism of strain relief in the final buffer steps, and the residual elastic strain in a buffer dislocation-free layer, are governed by the same phenomenological law as in a single-layer heterostructure.
关键词： InxAl1 ? xAs ternary solutions,step-graded metamorphic buffer layers,strain relief,reciprocal space mapping,molecular beam epitaxy
更新于2025-09-11 14:15:04
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Underpotential co-deposition of ternary Cu-Te-Se semiconductor nanofilm on both flexible and rigid substrates
摘要： To achieve homogeneous ternary compounds, the growth rates of the component species in a solution must be equal and the processes must be simultaneous. The conditions necessary for the growth of one species should not prevent the growth of the others. Herein we present a synthesis of Cu3Te2Se2 semiconductor nanofilms on indium tin oxide (ITO)-coated polyethylene terephthalate (ITO-PET), ITO-coated glass, and Au plate substrates by an electrochemical underpotential co-deposition (UPCD) method from the same solution at a constant potential. The chemical, morphological, and optical properties of the synthesized nanofilms were determined by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, ultraviolet-visible absorption spectroscopy (UV/Vis), and current-voltage (I-V) studies. The chemical formula of the deposited nanofilms was confirmed as Cu3Te2Se2 by X-ray photoelectron spectroscopy. The SEM images exhibited uniform nano-scale (~40 nm) distribution of the Cu3Te2Se2 nanofilms. The band gaps of the deposited films were determined according to the different deposition times and potentials. The XRD results showed crystalline and single-phase forms of Cu3Te2Se2 nanofilm. Finally, the I-V curves of the Cu3Te2Se2/ITO heterojunctions at room temperature (RT) under normal light conditions indicated matched those of a diode model.
关键词： Ternary Cu-Te-Se,Diode,Underpotential Co-deposition,Flexible surface,Electrochemistry,Semiconductor
更新于2025-09-10 09:29:36
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Reference Module in Chemistry, Molecular Sciences and Chemical Engineering || 2D Ternary Oxide Layers: New Paradigms of Structure and Stoichiometry
摘要： Two-dimensional (2D) oxide materials have tremendous potential in fundamental research and cutting edge technologies owing to their outstanding physical and chemical properties, which makes them excellent candidates for a wide range of applications including power harvesting, hydrogen storage, fuel cells, gas sensors, advanced electronic and spintronic devices, and nanocatalysis.1,2 To gain a fundamental understanding of the novel properties, afforded by the reduced dimension of oxide nanostructures, structurally well-defined model systems have been utilized, typically in the form of ultrathin oxide films (with a thickness of one to few atomic layers) epitaxially grown on single-crystal metal surfaces. Emergent phenomena in their geometric architecture, electronic and vibrational structure, chemical nature and magnetic behavior have been recognized,3–8 rendering oxide nanolayers vast and unforeseen opportunities in science and technology. To date, most of the studies have been focused on binary 2D oxides, but the increased interest in more complex oxide materials, such as ternary or multicomponent oxides with a broader range of functionalities, requires an adequate understanding of their properties at the nanoscale, which is still scarce. Even for high technologically important ternary oxides, such as the perovskites, there are only few studies reporting on the preparation of 2D oxide layers on metal supports, which are found to display unique structural behavior with no counterpart in the bulk.9,10 One reason for this is that the preparation of ternary oxide nanolayers with well-defined structure and stoichiometry is more challenging than for binary oxides, which requires the development of new fabrication strategies, where suitable thermodynamic and kinetic parameters have to be optimized in a narrow multiparameter space to obtain structures with desired stoichiometry and 2D morphology. Moreover, the elucidation of their structural properties at the atomic level is experimentally and theoretically more demanding than for the binary oxides.
关键词： stoichiometry,surface science techniques,2D ternary oxide layers,structure,metal tungstates
更新于2025-09-10 09:29:36
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A tunable broadband filter of ternary photonic crystal containing plasma and superconducting material
摘要： This work reports the optical properties of a one-dimensional (1D) ternary periodic structure composed of a dielectric, magnetized cold plasma (MCP) and superconducting material by using well-known simple transfer matrix method. The MCP has considered right-hand and left-hand polarizations having positive (? B) and negative (- B) transverse magnetic ?eld, respectively. The transmittance of the ternary photonic crystals is analyzed by varying the angle of incidence, the magnetic ?eld, the electron density of the magnetized cold plasma, the temperature of the superconductor, the thickness of magnetized cold plasma and superconducting material for the right-hand and left-hand polarization structures. The transmittance of the ternary photonic crystal containing dielectric, magnetized cold plasma and superconducting material has tunable broadband and narrowband ?lters for the left-hand and right-hand polarizations, respectively. The magnetized cold plasma layer in the ternary photonic crystal also played an important role to form the tunable gap due to the transverse magnetic ?eld. The analysis of the transmittance of the ternary photonic crystal containing dielectric, magnetized cold plasma and superconducting materials has shown an innovative idea for the formation of the tunable broadband and the narrowband ?lters.
关键词： 1D ternary photonic crystal,Magnetized cold plasma,Tunable broadband and narrowband ?lters,Superconducting material
更新于2025-09-10 09:29:36
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Temperature sensor utilizing a ternary photonic crystal with a polymer layer sandwiched between Si and SiO2 layers
摘要： Recently, one-dimensional periodic ternary photonic crystals have shown outstanding properties when compared to one-dimensional periodic binary photonic crystals. In this work, a ternary photonic crystal is proposed as a temperature sensor. The structure of the ternary photonic structure is considered Si/polymer/SiO2. The transmission spectra of the proposed ternary photonic structure are studied for different temperatures. It is observed that as the temperature increases, the transmission peak shifts toward higher wavelengths due to thermo-optic and thermal expansion coefficients of the polymer. It is found that the temperature-sensitive transmission peak shift is considerably enhanced due to the insertion of the polymer layer between Si and SiO2 to constitute a ternary photonic crystal.
关键词： Temperature sensor,Polymers,Ternary photonic crystal
更新于2025-09-10 09:29:36
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Multiple charge carrier transfer pathways in BiOBr/Bi2O3/BiO0.67F1.66 ternary composite with high adsorption and photocatalytic performance
摘要： BiOBr/Bi2O3/BiO0.67F1.66 ternary composites were designed and prepared via a facile chemical precipitation method and their photocatalytic performances were assessed by degradation of rhodamine B (RhB) under visible light illumination. The highest activity was achieved over BiOBr/Bi2O3/BiO0.67F1.66 ternary composite with Br/F molar ratio of 1:1, which approximately degraded 98.61% of RhB after just 15min irradiation. Contrast to pure BiOBr, the enhanced photocatalytic performances of the ternary composites could be attributed to their larger specific surface areas and multiple charge carrier transfer pathways, which efficiently promoted separation of charge carriers. Besides, the formation mechanism of the composites was discussed in detail as well.
关键词： Bi2O3,Charge carrier transfer pathway,BiOBr,Ternary composite,BiO0.67F1.66
更新于2025-09-10 09:29:36
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Crystal and Electronic Structure and Optical Properties of <i>AE</i> <sub/>2</sub> SiP <sub/>4</sub> ( <i>AE</i> = Sr, Eu, Ba) and Ba <sub/>4</sub> Si <sub/>3</sub> P <sub/>8</sub>
摘要： Three new compounds in the AE-Si-P (AE = Sr, Eu, Ba) systems are reported. Sr2SiP4 and Eu2SiP4, the first members of their respective ternary systems, are isostructural to previously reported Ba2SiP4 and crystallize in the noncentrosymmetric I4ˉ2d (no. 122) space group. Ba4Si3P8 crystallizes in the new structure type, in P21/c (no. 14) space group, mP-120 Pearson symbol, Wyckoff sequence e30. In the crystal structures of Sr2SiP4 and Eu2SiP4 all SiP4 tetrahedral building blocks are connected via formation of P–P bonds forming a three-dimensional framework. In the crystal structure of Ba4Si3P8, Si-P tetrahedral chains formed by corner-sharing, edge-sharing, and P–P bonds are surrounded by Ba cations. This results in a quasi-one-dimensional structure. Electronic structure calculations and UV/Vis measurements suggest that the AE2SiP4 (AE = Sr, Eu, Ba) are direct bandgap semiconductors with bandgaps of ca. 1.4 eV and have potential for thermoelectric applications.
关键词： Silicon,Barium,Ternary system,Semiconductors
更新于2025-09-09 09:28:46
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Nitrogen Trapping Ability of Hydrogen-Induced Vacancy and the Effect on the Formation of AlN in Aluminum
摘要： This paper presents the ternary interaction of N, H, and vacancy point defects and the nitrogen trapping ability of aluminum vacancies induced by hydrogen by means of DFT methods employed in VASP (Vienna Ab initio Simulation Package) and Abinit packages. The obtained vacancy formation energy of 0.65 eV is close to experimental values. Although the N–vacancy complex is unstable with the negative binding energy of ?0.51 eV, the stability of H–vacancy–N is proved by the positive binding energy of 0.59 eV and the appearance of the orbital hybridization in the density of state (DOS) of atoms connecting to this complex. Moreover, Al vacancies can trap more than 4 N atoms, which prevents the formation of aluminum nitride and subsequently affects not only the hardness of the Al surface but also many practical applications of AlN coating.
关键词： ternary point-defect interaction,first-principles calculations,alpha aluminum,superabundant vacancy
更新于2025-09-09 09:28:46
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An insight into the polarization mechanism of rutile based oxides with a wide doping levels in the TiO2-CuO-TaO2.5 ternary system
摘要： Excellent dielectric properties have been found in some acceptor-donor co-doped rutile TiO2 type materials, but the polarization mechanism has long been debated. In present work, the polarization behaviors of single solid solutions Ti1-x(Cu0.333Ta0.667)xO2 (0 < x ≤ 0.465) samples are systematically investigated by establishing the ternary phase diagram of Ti1-xCu2x-2.5yTayO2 (0.05 ≤ x ≤ 1, 0 ≤ y ≤ 0.667). Basing on the obtained phase diagram and the analysis about microstructure, element valence and dielectric behaviors of rutile Ti1-x(Cu0.333Ta0.667)xO2 compositions with various doping levels (x = 0%, 5%, 18%, 33% and 45%), it is demonstrated the existence of multiple polarization mechanisms in this ternary dielectric system, i.e. free carrier nearest-neighbor-hopping polarization as well as internal barrier and surface barrier layer capacitor effect, contribute together to the overall dielectric behaviors. This work would provide guidance to achieve new electronics material with desired structures and properties.
关键词： Impedance spectrum,Polarization mechanism,High doping level,Ternary phase diagram
更新于2025-09-09 09:28:46