Synthesis And Property Of Ag@C Nanocables And Its Composite Material

In recent years, nanoscale materials, especially with one-dimensional (1D)nanostructure such as rods, wires, and tubes, have attracted intensive investigations due to their unique shapes, size-dependent properties and the intriguing prospects for developments in novel electro-optical applications and catalysis. Developing new preparation methods and new systems of one-dimensional nanomaterials is a very important topic in current research activities in the fields of physics, chemistry and materials science. Obtaining new materials via a relatively simple route and developing the morphology-controlled synthesis methodologies are a goal of great interest in materials science. Hydrothermal method, which is known as a solution-based chemical method, might provide an effective and convenient route to generate nanoscale materials with great advantages such as high efficiency,inexpensive equipments, and dispensing with any inert atmosphere protection. It has been developed and widely used in preparing 1D nanostructured materials, zeolites and ceramic materials etc. It is also one of the most promising methods for controlling product morphology, size, and size distribution in nanaomaterials fabrication.In this work, the main purpose is to synthesize the 1D Ag@C nanocables by a one-pot facile hydrothermal growth, and optimize the synthesis conditions, and to investigate the form mechanism. Moreover, we also synthesis the Ag@C/CeO2 composite photocatalyst. In recent years, With the deterioration of worldwide environment, semiconductor multiphase photocatalytic reactions in the application of environmental protect protection becoming more and more attention. The main results summaried as follows:1.We exploit facile hydrothermal growth of ultralong silver@carbon nanocables with Ag nanowires as the cores and carbon as sheaths, through the mediation of H2SO4 and without using an organic surfactant. In the investigation, Ag-carbon nanostructures were systematically and extensively studied as a function of both temperature and H2SO4 concentration, to locate the optimal conditions for preparing high-quality Ag-carbon nanocables. The characterization clearly demonstrated a simple and efficient synthesis of nanocables with silver nanowires as the cores and carbon as the sheaths, in the absence of a surfactant. In the hydrothermal process, glycerol acts as both reducing agent and carbon source, while H2SO4 is used in the system to mediate the directional growth of the silver nanowire core and assist the deposition of carbon on the silver surface in constructing the Ag-carbon coaxial nanocables. The formation and nanostructuring of the Ag-carbon nanocables was evidently demonstrated by the XRD patterns, SEM and TEM images, HRTEM lattice imaging, TGA, Raman, FTIR UV-vis and spectral analysis. The most favourable reaction conditions for the generation of ultralong, robust and uniform Ag-carbon coaxial nanocables were found to be at T= 180℃and 0.5M H2SO4. Of significance, the nanocables manifest unusual ferromagnetism at room temperature. In addition, the plausible mechanism of forming Ag-carbon nanocables was proposed as a result of the chain-like hydrogen sulphate compounds owing to the H2SO4 mediation. This green, surfactant-free facile hydrothermal process is encouraging for future bulk synthesis and functionalizing various carbon-related nanomaterials of technical importance.2.In this work, instead of glycerol with glycol, we synthetize silver@carbon nanocables with Ag nanowires as the cores and carbon as sheaths The 1D Ag@C nanocables have been obtained and extensively studied as a function of temperature to locate the optimal conditions for preparing high-quality Ag-carbon nanocables. respectively. The growth mechanism of Ag@C nanocables has been researched. The obtained nanostructures were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and UV-VIS spectrum analysis. SEM and TEM images show the product obtained is composed of copper/carbon nanocables with the length of dozens of microns and diameters of 90 nanometers. The UV-VIS spectrum for the nanocables shows one broad typical absorption peaks located at 405nm. The obtained nanocables are well-defined 3. Rare earth oxides is a kind of polymorphous substance which has strongadsorption and stability,and thy has a large capacity in our country. CeO2 is n-type semiconductor, its light absorption threshold is about 420nm, higher than the most commonly used semiconductor materials TiO2.O2- ions of their crystal lattices are missed more easily, resulting in lack of more easily CeO2 crystals in electronic high concentration and will have a fasterr Interface electron-transfer reactions when they stimulated by laser exciation.Excellent adsorption oxygen and release oxygen performance greatly reduces the light of electronic and cavities born, making it easy to compound chance may have a good light catalytic performance. In this chapter rare earth salt Ce (NO3) 3·6H2O as raw materials by hydrothermal method synthetize Ag @ C/CeO2 composite compounds. The tests on photocatalytic degrading of methylene blue (MB) using as-prepared Ag@C/CeO2 composite photocatalyst were investigated,then photocatalytic experiments were carried out under Sunlight. Ag@ C/CeO2 sample showed an excellent photocatalytic performance compared to the pure CeO2. Ag@C/CeO2 composite photocatalys is new,efficient and cheap catalyst which degrade high concentration organic wastewater...