Advanced Materials Research Vol. 1052

Abstract: Thermal stability, adhesion and electronic resistivity of the Cu alloy films with diffusion barrier elements (large atom Sn and small atom C) have been studied. Ternary Cu (0.6 at.% Sn, 2 at.% C) films were prepared by magnetron co-sputtering in this work. The microstructure and resistivity analysis on the films showed that the Cu (0.6 at.% Sn, 2 at.% C) film had better adhesion with the substrate and lower resistivity (2.8 μΩ·cm, after annealing at 600 °C for 1 h). Therefore, the doping of carbon atoms makes less effect to the resistivity by decreasing the amount of the doped large atoms, which results in the decreasing of the whole resistivity of the barrierless structure. After annealing, the doped elements in the film diffused to the interface to form self-passivated amorphous layer, which could further hinder the diffusion between Cu and Si. So thus ternary Cu (0.6 at.% Sn, 2 at.% C) film had better diffusion barrier effect. Co-doping of large atoms and small atoms in the Cu film is a promising way to improve the barrierless structure.

Abstract: The method of the synthesis of dibutyl phosphate from phosphorous acid and n-butanol has been explored. Effects of reaction conditions, such as the ratio of raw materials, reaction temperature, reaction time, catalyst type, and reaction time were investigated. The methods of analysis were studied. The composition of product was analyzed by titration method. The result showed: the best temperature was 125-135°C,the mole ratio of n-butanol / phosphorous acid was 3.6, the best reaction time without catalyst was 3h, the yield of dibutyl phosphate was 68%. The product can be separated by the agent of n-butanol/benzene 10:1 in TLC.

Abstract: Further improvement was conducted on the technology of chemical copper plating on the surface of the plastic matrix according to the requirements of plant. Multiple factors were researched on Ni-Co-P alloy electroplating technology. The optimum technology to electroplating Ni-Co-P alloy on plastic matrix was founded through orthogonal design test. The time of electroplating process is short. The coating is smooth, fine and bright. It was show through determination that the combination is strong between coating and matrix and the content of phosphorus is 8.1%.The coating is amorphous alloy .The corrosion resistance and abrasive resistance of the coating are fine. The coating has magnetism and very good decorative.

Abstract: Photoluminescence of porous silicon (PS) prepared by different etched time was studied. The photoluminescence might originate from the recombination of carriers and surface states, which was proved by FTIR, Raman spectroscopy and SEM. Furthermore, the hydrogen-related groups on the PS surface could eliminate the surface states for the blue emission, but the quantities of surface states for the green emission were depended on the uncovered area on the PS surface. Moreover, the shape of photoconductivity curve was depended on the quantities of the surface states, which also was related to the uncovered area on the PS surface. In addition, the results of the microwave-detected photoconductivity decay measurement indicated thatthe defects on the PS surface increased with the increase of the etched time, which would be related to the increase of the depth of pores.

Abstract: Three aryl and three naphthylmethylene derivatives containing thiadiazole ring have been synthesized. The structures of target compounds were characterized on the basis of spectral (FT-IR, ¹H NMR, and MS). The optical properties were detected using UV-vis absorption spectroscopy and fluorescence spectroscopy. The absorption spectra of 1a, 2a and 3a substituted by naphthylmethylene are primarily characterized by a peak around 284 nm originating from naphthalene, which is different from that of compounds 1b, 2b and 3b. Compared to 1a and 2a (separated by a saturable atomic cluster −CH₂−), the maximum absorption wavelength of 1b and 2b takes on obvious red-shifted, which is from thiadiazole and benzene with more large conjugated system. The fluorescence intensity of 2-(4-aminobenzoyl) amide-5-naphthylmethylene-1,3,4-thiadiazole (3a) was significantly higher than that of 5-(4-aminobenzoyl)-1,3,4-thiadiazole (3b) due to the presence of naphthalene.

Abstract: Well-defined LaBO₃ hierarchical architectures have been successfully synthesized by a designed hydrothermal conversion method. La (OH)₃ nanowires were prepared through a simple hydrothermal process. Subsequently, uniform 3D LaBO₃ architectures were synthesized at the expense of the La (OH)₃ nanowires during a hydrothermal process. The whole process was carried out under aqueous conditions without the use of any organic solvent, surfactant, or catalyst. The as-obtained LaBO₃:Tb³⁺ product shows strong characteristic green emission under ultraviolet or low-voltage electron beam excitation, which might find potential applications in fields of fluorescent lamps, display systems, and optoelectronic devices.

Abstract: Uniform Y₂O₃ hollow microspheres have been successfully prepared via a urea-based homogeneous precipitation technique with colloidal carbon spheres as template followed by a subsequent calcination process. The template can be effectively removed and the amorphous precursor has converted to crystalline Y₂O₃ during the annealing process. SEM images indicate that the hollow spheres inherit the spherical shape and good dispersion of the templates, and the shell of the hollow spheres is composed of a large amount of uniform nanoparticles. The lanthanide activator ion Ln³⁺-doped Y₂O₃ hollow microspheres exhibit bright upconversion luminescence with different colors under 980 nm light excitation, which may find potential applications in the fields such as light phosphor powders, advanced flat panel displays, or drug delivery.

Abstract: (Gd,La)_2-x O₂CO₃:Eu_x³⁺(0.01 ≤x≤0.04) were synthesized via a flux method at 400°C, and their photoluminescence properties under vacuum ultraviolet (VUV) excitation were examined. The excitation spectra showed two bands in the region from 125 nm to 300 nm, the first band centered at 190 nm was ascribed to absorption of related CO₃^2- complex, and the second broad band centered at 246nm and 278nm in Gd₂O₂CO₃:Eu³⁺ was ascribed to the charge transfer band of O^2-→ Eu³⁺. Series samples exhibited red emission at around 611 nm under vacuum ultraviolet excitation corresponding to the ⁵D₀ → ⁷F₂.transition of Eu³⁺.

Abstract: The crystal structure of 1, 3-propanediol bis (4-aminobenzoate) has been determined by single crystal X-ray diffraction. The UV-vis spectra have been characterized experimentally. The nonlinear optical properties were investigated with the density functional theory method. The calculated first hyperpolarizability values are 7.69×10^-30, 14.22×10^-30 and 26.66×10^-30 esu for the monomer, dimmer and trimer structure of the compound. The results show that the compound has high hyperpolarizability and the hyperpolarizability multipled along with the increasing number of the molecules.

Abstract: In this work, A molecularly imprinted polymers (MIPs) electrochemical sensor based on chitosan (CS) and nickel electrode was constructed, finally used in glucose measurement. The MIPs sensor was prepared through electrodepositing glucose–CS composited film on the electrochemical treated nickel then removing glucose from the film via water elution. The morphology and electrochemical properties of the sensor were characterized via scanning electron microscope (SEM) , cyclic voltammetry (CV), respectively. Amperometric responses of the CS (MIP)-NiO electrode toward glucose was well-proportional to the concentration of the range from 10 μM to 200 μM. The developed sensor obtained the specific recognition to glucose against coexisting interferences such as oxalic acid, uric acid and ascorbic acid.