Nanowires

Xem 1-20 trên 169 kết quả Nanowires
  • Graphene quantum dots (GQDs) were synthesized and incorporated with polyethylene dioxythiophene:poly(4-styrenesulfonate (PEDOT:PSS), Ag nanowires (AgNWs) to form a composite that can be used for enhancement of relative humidity (RH%) sensing. The composite films contained bulk heterojunctions of AgNW/GQD and AgNW/PEDOT:PSS. The sensors made from the composites responded well to relative humidity in a range from 10% to 50% at room temperature.

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  • TiO2 nanowires doped with different amounts of Ni2+ ions (from 0 to 18 mol%) were synthesized by hydrothermal technique. The samples were characterized by X-ray diffraction (XRD) and Raman spectroscopy, field emission scanning electron microscopy (FESEM), and diffuse reflection spectroscopy. The XRD analysis showed that the doped samples exhibit anatase single phase. The lattice parameters remain unchanged, independent on Ni2+ content.

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  • The magnetic properties in CoNiP/Au multisegments nanowire were investigated. All the samples were prepared by electrodeposition method with pH of 5.5 and room temperature. The electrochemical potential of CoNiP was determined by cycle voltammetary. The crystalline structure and morphology of the samples were characterized by X-ray diffraction (XRD), Scanning Electron Miroscopy (SEM) and High-resolution transmission electron microscopy (HRTEM), respectively.

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  • The structure and morphology of the synthesized silver nanostructures were characterized using transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). The results showed that the morphology of the silver nanowires can be effectively controlled via adjusting parameters of the synthesis process.

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  • The Co nanowire arrays were fabricated by electrodeposition method by using the porous polycarbonate template. Study on crystallographic structure, micro structure, and the element composition confirmed the quality of the fabricated Co nanowires. SEM image shows the wires with an average diameter of 200 nm and the average length of 9 m.

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  • The gas-sensing performance of the SnO2 nanowires sensors annealed at different temperatures have also investigated. The results revealed that the annealed temperatures of 400 C and 500 oC do not affected on gas-sensing performance of SnO2 nanowires sensors, while the annealed temperature of 600oC results in strong decrease in NO2 gas response as compared with as-grown SnO2 nanowires sensor.

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  • Silicon nanowires (Si NWs) were fabricated on Si(111) surfaces by both thermal evaporation and sputtering methods. Au nanocrystals were used as the metal catalysts and they were fabricated by electron beam evaporation. The field emission scanning electron microscopy (FESEM) was used to characterize the Si NWs. The diameters of the Si NWs were measured to be about few tens of nanometer. The mechanism of the nanowires formation by these methods was also discussed.

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  • In this paper we review our works in the field of nonlinear optics in waveguide arrays (WAs) and photonic nanowires. We first focus on the new equation governing light propagation in optical fibers with sub-wavelength cores which simultaneously takes into account (i) the vector nature of the electromagnetic modes inside fibers, (ii) the strong dispersion of the nonlinearity inside the spectral body of the pulse, (iii) and the full variations of the vector mode profiles with frequency.

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  • Sodium manganese oxide (NaxMnO2) has attracted much attention as cathode materials for alkaline ion battery due to the ability of the fast charge and discharge of Na+, in particular in nanoscale. We report on the synthesis of NaxMnO2 nanowires via hydrothermal synthesis route from Mn2O3 and NaOH solution. The morphological observation indicates that the obtained Na0.44MnO2nanowires with diameters of about 20 nm -30 nm, length up to several micrometers were formed by this process.

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  • This paper presents the fabrication of CoNiP single segment and CoNiP/Au multisegment nanowires. We have fabricated these nanowires by electrodeposition method into polycarbonate templates with a nominal pore diameter about 100 nm. The hystersis loops were measured with the applied magnetic field parallel and perpendicular to the wire axis using a vibrating sample magnetometer (VSM).

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  • In this work, we have investigated the effects of thermal annealing on interconnected at nanowire junctions and between AgNWS network and rGO films via their sheet resistance and transmission. The annealing temperature was varied from 120˚C to 180˚C with 10˚C step to find out optimal temperature at which the wires can be joined together. The results show that at 170˚C, the sheet resistance and transmission of the hybrid rGO/Ag NW film are Rs = 10.

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  • Magnetic measurements indicate a dependence of the squareness and the coercivity of the magnetization hysteresis loop on pH values with a maximum coercivity of 1425 Oe. The morphological properties of CoNiP nanowires were studied by transmission electron microscopy (TEM). The chemical composition was determined by examination of the energy dispersive X-ray (EDS) spectra and the magnetic properties were measured by vibrating sample magnetometry (VSM).

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  • In this report, we study the effect of silver nanowires (AgNws) dimension to electrical properties of rGO/AgNws hybrid. The alteration of these electrical properties leads the difference of ammonia sensibility of the rGO/AgNws hybrid based sensing devices. When the rGO is accompanied by AgNws of different sizes from ∼ 500 nm to > 10 µm, the ammonia sensitivity of these hybrids change from 60% to 340% alteration compared with the bare rGO material.

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  • The undoped and transition metal (Co, Ni)-doped TiO2 nanowires were synthesized by simple and low cost solvothermal method and their microstructure and optical properties were investigated based on the fixed doping concentration of 1 at.%. The X-ray diffractometer and highresolution transmission electron microscopy demonstrated that the nanowire had a singlecrystalline rutile structure and grew along the [001] growth direction.

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  • Nanowires can be defined as structures with thicknesses or diameters of tens of nanometers or less and unconstrained lengths. Many different types of nanowires exist, including metallic (e.g., Ni, Pt, Au or different alloys based on metals), semiconducting (e.g., Si, InP, GaN, etc.), insulating (e.g., SiO2, TiO2), and molecular nanowires (e.g. organic DNA or inorganic). Nanowires have many interesting properties that are not seen in bulk or 3-D materials.

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  • This potentially unique work offers various approaches on the implementation of nanowires. As it is widely known, nanotechnology presents the control of matter at the nanoscale and nanodimensions within few nanometers, whereas this exclusive phenomenon enables us to determine novel applications. Nanowire technology has considerably improved and developed many technologies and industry sectors in the field of IT, communications, computer technology, medicine devices, sensors applications and many others....

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  • Tham khảo sách 'nanowires implementations and applications_2', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • There are two basic approaches of synthesizing nanowires: top-down and bottom-up pproach. In a top-down approach a large piece of material is cut down to small pieces hrough different means such as lithography and electrophoresis. In a bottom-up approach he nanowire is synthesized by the combination of constituent ad-atoms. Most of the ynthesis techniques nowadays are based on bottom-up approaches.

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  • The study of quasi 1-dimensional (1d) semiconductor nano-crystals (so-called nanowires) represents the forefront of today’s solid state physics and technology.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Efficient thermoelectric energy conversion on quasi-localized electron states in diameter modulated nanowires

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