【摘 要】
：
We presented a simple yet convenient hydrothermal approach for the large-scale synthesis of uniform cylindrical silver (Ag) single-crystalline nanowires with diameters of about 25 nm and lengths of 1-4 μm. Poly(vinyl pyrrolidone) (PVP) was used as a reduc
【机 构】
：
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
We presented a simple yet convenient hydrothermal approach for the large-scale synthesis of uniform cylindrical silver (Ag) single-crystalline nanowires with diameters of about 25 nm and lengths of 1-4 μm. Poly(vinyl pyrrolidone) (PVP) was used as a reducing agent, and AgCl was used as a precursor to deliberately control [Ag+] at a low degree in the overall reaction process through its dynamic equilibrium by directly reducing AgCl with PVP at a quasi-equilibrium growth condition. The as-obtained products were characterized by powder X-ray diffraction (XRD) patterns, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), infrared spectra (IR) and Raman spectra. Factors such as [PVP], reaction temperature, time, and species of reducing agents and precursors were investigated to have strong influences on the morphologies and structures of the resultant Ag nanostructures. The wire diameter can conveniently be adjusted between 25 and 50 nm by simply adjusting [PVP], reaction temperature and reducing agent species. The as-synthesized silver nanowires can be self-assembled into perfect order arrays after being dried on tin foil due to the PVP coating on the surface, the circular cross-section and the uniform diameter of the Ag nanowires. These special silver nanowires with a core-shell structure as well as their spontaneous self-assembly of order arrays are expected to provide potential applications in flexible conductors, dielectric materials, electromagnetic shielding materials and nano-devices.
其他文献
Three different kinds of sepiolite (Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis (TG), X-ray diffraction diffractometer (XRD), scanning electron microscopy (SEM), BET (specific surface area f
Herein, two nanoparticles with different dimensions, spherical carbon dots (C-dots) and sheet-like hectorite clay, were used as physical crosslinkers to fabricate C-dots-clay-poly(N-isopropylacrylamide) nanocomposite hydrogels (coded as C-dots-clay-PNIPAm
To evaluate the property and degradation characteristics of concrete prepared with aggregate contained montmorillonite,concretes were prepared with aggregates contained montmorillonite,and then concrete slump loss,compressive strength,electric flux,the re
2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18％H2SO4 solution (Solu.A) and the mixture solution of 18％H2SO4+5％C2H2O4 (Solu.B) at room temperature.12 and 11 V was optimized as the applied oxidation potential for 2198 and 5A90 a
A niobate/titanat nanoflakes (Nb/TiNFs) composite was synthesized via the hydrothermal method and used to remove Pb(II) from water. XRD, TEM, and SEM results indicate that Nb/TiNFs appear as nanoflakes, of which the primary crystal phase is tri-titanate.
The modification of graphitic carbon nitride can significantly improve the photocatalytic performance of graphitic carbon nitride (g-C3N4). Fe2O3/nitrogen-deficient g-C3N4-x composite catalysts were prepared with dicyandiamide as the precursor and Fe3+ do
Based on the experimental analysis and theoretical calculation,the self-propagating high temperature synthesis of TiB2/Fe composite was studied.The experimental results show that the interfacial between TiB2 and Fe was smooth and clear,and the composite b
SiC/7075 aluminum matrix composites were prepared by a liquid stirring method. The role of Ti facilitating the preparation of SiC/7075 aluminum matrix were studied by means of direct-reading spectrometer, scanning electron microscope, energy dispersive sp
The aluminum matrix composites (AlB2+α-Al2O3)/Al were fabricated by in situ reaction synthesis from an Al-B2O3 system. The reaction pathways, apparent activation energies and tensile properties were analyzed by using differential scanning calorimetry (DSC
Three as-cast and as-extruded Mg-5Zn-xY-0.6Zr (x=5 wt％,8 wt％,11 wt％) alloys were prepared,and the effects of Y content on the microstructures and mechanical properties of the alloys were investigated.The results show that the investigated Mg-Zn-Y-Zr alloy