This paper describes the preparation of uniform silver nanowires by reducing freshly prepared silver chloride with glucose at 180 degrees C for 18 hours in the absence of any surfactants or polymers. Scanning electron microscopy studies indicated that the silver nanowires are about 100 nm in diameter and up to 500 microm in length. High-resolution transmission electron microscopy analyses showed that the silver nanowires grow perpendicularly to the Ag(200) plane. The silver nanowires are believed to grow through a solid-solution-solid process. Some influential factors on the growth of silver nanowires are also discussed.
Uniform Co9S8 nanotube arrays on conductive nickel foam were successfully synthesized through a facile two-step hydrothermal method and were directly applied as the electrode for high-performance electrochemical capacitors. The formation of the tubular structure of Co9S8 can be attributed to the nanoscale Kirkendall effect. SEM and TEM images show that most of the Co9S8 nanotubes have hexagonal sections. The diameter of the Co9S8 nanotubes is about 120-200 nm and the wall thickness is of 40-60 nm. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance measurements are applied to investigate the electrochemical performance of the Co9S8 nanotubes. The specific capacitance of the Co9S8 nanotubes is 1775 F g(-1) at 4 A g(-1), and 1483 F g(-1) at 24 A g(-1), indicating the high rate capability. Also, the Co9S8 nanotubes exhibit stable cycling performance.
M/Cu 2 O (M ¼ Ag, Au) heterogeneous nanocrystals are successfully prepared by depositing noble metal nanoparticles onto the surfaces of Cu 2 O octahedral nanocrystals through a simple photocatalytic process. The samples are characterized by means of X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX). The influence of the light source and solution temperature on the deposition of noble metal (taking Ag as an example) nanoparticles has been studied. The experimental results show that visible light is more favorable for the deposition of Ag nanoparticles onto Cu 2 O nanocrystals, and a solution temperature of more than 30 C can prevent the erosion of Cu 2 O. The photocatalytic properties of the prepared M/Cu 2 O heterogeneous nanocrystals are studied, showing enhanced photocatalytic activities.
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