Advanced Materials Research Vols. 834-836

Abstract: In₂O₃ nanorods have been fabricated on Cr comb-shaped interdigitating electrodes using thermal evaporation of the mixed powders of In₂O₃ and active carbon with Au catalysts. The morphology and structure of the prepared nanorods are determined on the basis of field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The self-assembly grown sensors of In₂O₃ nanorods have excellent performance in sensor response to alcohol concentration of 500 ppm under operated temperature of 300°C.

Abstract: FeSi/SiO₂ Core-shell nanoparticles were synthesized by DC arc-discharge approach and annealing process. The products were characterized by SEM, TEM, EDX, XRD and VSM. As-prepared FeSi/SiO₂ Core-shell nanoparticles have the diameter of 40-100 nm and the thickness of the SiO₂ shell is about 20 nm. The growth mechanism based on the crystallographic and thermodynamic theory was explained. Magnetic characterization was carried out and the results showed that the FeSi/SiO₂ Core-shell nanoparticles exhibited superparamagnetism characteristic at room temperature.

Abstract: The Bi₂WO₆ three-dimensional (3D) hierarchical microspheres from nanoplates have been synthesized by a hydrothermal route. The products were characterized in detail by multiform techniques: X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDS), scanning electron microscopy (SEM), and UVVis absorption spectrum. XRD patterns indicated that the Bi₂WO₆ three-dimensional hierarchical microspheres were orthorhombic phase. Furthermore, SEM revealed that Bi₂WO₆ three-dimensional hierarchical microspheres consisted of Bi₂WO₆ nanoplates.

Abstract: Our work is dedicated for review of the synthesis of the new nanocomposite media with Au and CdS nanoparticles. Also formation of filament structure in presented samples as result of interaction with femtosecond laser pulses in depending on the component composition of the samples and the various experimental conditions was investigated.

Abstract: We synthesized ZnO:Co thin films on sapphire (0001) substrates by laser molecular beam epitaxy (LMBE) method. X-ray diffraction (XRD) spectra indicated that all samples possessed wurtzite structure with the preferential c-axis-orientation and the value of the c-axis lattice decreased with increasing substrate temperature. UVvis transmittance spectra and X-ray photoelectron spectroscopy (XPS) implied that Co²⁺ ions incorporated into ZnO lattice with substitution for Zn²⁺ ions and the non-bivalent Zn existed in as-prepared thin films. Two emission bands located at 418 nm (2.97 eV) and 490 nm (2.53 eV) were observed from the photoluminescence (PL) spectra of all samples. The two emission bands were in relation to Zn interstitials and the complex of V_O and Zn_i (V_OZn_i). The quantity of the Zn interstitials remained mostly invariable as substrate temperature increased.

Abstract: Hydrogenated silicon thin film was prepared by plasma enhanced chemical vapor deposition (PECVD). The effects of the deposition pressure on the growth rate, the photoelectronic and microstructure properties of the thin films were investigated via transmission, photo/dark conductivity, Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR) measurements. The results indicate that the increase of the deposition pressure increases the bandgap and the growth rate, while makes the photosensitivity get worse, decreasing from more than ~10³ to ~10². And at the same time, the crystalline volume fraction (Xc) in the film decreases from 70% to 61%, when the deposition pressure increases from 100 Pa to 500 Pa. The order degree of the microstructure was deteriorated with pressure increasing.

Abstract: In order to realize the adhesion between low-density polyethylene film and aluminium foil. Several nanofibre arrays were fabricated on low-density polyethylene film by template method to imitate strong adhesive nanohairs on the feet of gecko lizards. The results showed that the nanofiber arrays greatly improved the peel stength between low-density polyethylene film and aluminium foil and met the actual requirement. The peel strength increased with the decrease of the adjacent distance of the nanofibre arrays. when the distance and height of nanofibre kept unchangable, the peel strength increased with the deccrease of the diameter of the nanofire when the diameter is larger than 500nm. The peel strength decreased with the deccrease of the diameter of the nanofibres when the diameters were smaller than 500nm. The peel strength increased with the increase of the height of the nanofibres when the heights of nanofibres were lower than 5μm. When the heights of nanofibres were higher than 5μm, the peel strength decreased with the increase of the heights of nanofibre arrays.

Abstract: With high optical transparency and electrical conductivity, ITO thin films were fabricated by DC magnetron sputtering. Based on orthogonal test table L18 (35), the effects of process parameters included water partial pressure, work pressure, substrate temperature, oxygen flow rate and sputtering power, on the optoelectronics properties of ITO thin films were investigated in detail(systematically). Calibration of sheet resistance transmittance, atomic force microscope, and X-ray diffraction were employed to characterize the ITO films.

Abstract: A semi-interpenetrating network hydrogel with pore structure (P-S-IPN) was prepared by solution polymerization with 4-acetyl acryloyl ethyl acetate (AAEA) and crylic acid (AA) as monomers, polyvinylpyrrolidone (PVP) as the second network and polyving akohol 2000(PEG2000) as a pore-foaming agent. Gold nanoparticle composite hydrogel (GNPs gel) was obtained through in-situ reduction reaction by using P-S-IPN as a template. P-S-IPN exhibits excellent mechanical strength, the maximum compressive strength is 14.0 Mpa. The influence of the dosage of PEG2000 on the swelling/deswelling properties of P-S-IPN and GNPs gel was investigated. The pore structures could shorten the time that P-S-IPN takes to reach swelling equilibrium from 170min to 75min, improve the ability of P-S-IPN to absorb AuCl₄^-. The swelling/deswelling properties of GNPs gel under an applied voltage showed when the concentration of NaCl solutions exceed 0.025mol/L, the hydrogel swells, when the concentration of NaCl solutions is below 0.025mol/L, it deswells.

Abstract: ε-polylysine (ε-PL) was blended with polyvinyl alcohol (PVA) to obtain biodegradable films. Blends and neat polymer films (PVA) were characterized for their structural and mechanical properties as well as antibacterial activity. The addition of ε-polylysine reduced Young modulus (E_young), tensile strength (TS) and elongation at break (%E) of the ε-polylysine/PVA film. The ε-polylysine/PVA film shows good antibacterial activity and therefore has potential applications in packaging industry.