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Design, Synthesis and Applications of Noble Metal Nanoparticles/1-dimensional Structure Nanocomposites

Author: WangZuo
Tutor: GengBaoYou
School: Anhui Normal University
Course: Materials Physics and Chemistry
Keywords: Noble metal nanoparticles One-dimensional structure Nanocomposites Synthesis Application
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 101
Quote: 0
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Abstract


The nanocomposite materials do not have excellent performance, such as different surface composition, magnetic, optical performance and stability. Due to a wide variety of the nanocomposites and nano-phase composite particles have unique features, the construction and function of the nanocomposites has become a hot research field of nano-chemistry. This paper creatively to design a series of novel, simple, green synthetic methods to synthesize noble metal nanoparticles / one-dimensional composite. In addition, according to the needs of different application areas, in order to give full play to the characteristics of each component, respectively, to select the most representative one-dimensional semiconductor materials, magnetic materials, carbon nanotubes and other materials, to design a series of novel noble metal nanoparticles and one-dimensional inorganic nanomaterials composite structure, performance and application of research and for the preparation of the material. The main content of this paper is as follows: 1. Due to the urgent needs of the field of the environment and IZnC) an important role in water treatment, we hope to be able to synthesize a () nano-structure based on one-dimensional Zn and precious metal nanocomposite material, the material at the same time both precious and one-dimensional properties of the materials, we can give full play to the Zn () special role in water treatment, they can compensate for their inadequacies, thus greatly improving the nanocomposites value in practical applications. We creatively using a room-temperature water-phase synthesis system to control the growth of precious metals / ZnO composite nanomaterials synthesis route. This method not only can quickly and easily synthesized Zn () / precious metal heterostructures, and the spatial distribution of metal nanocrystals and controllable load characteristics. Meanwhile, we also studied the photocatalytic properties of the resulting composite nanostructures as well as in the field of environmental protection. Experimental results show that, znc) nanorods / Au composite structures exhibit the phenomenon of strong by the structure of light caused by catalytic performance enhancements, such as 15 min to completely catalyzed degradation of rhodamine B, and can be decomposed and removed from the water and 91% of the 4 a chlorophenol has important application prospect. 2. Noble metal nanoparticles and carbon nanotube composite materials are widely used as a cathode catalyst of the fuel cell. However, how to maximize the value and utilization efficiency of the composite carbon nanotubes deposited on the surface size and load controlled noble metal nanoparticles with special morphologies. Controllable synthesis of a precious metal / Zn in the realization of a simple operation at room temperature () Nanocomposites based on, we will expand this novel synthesis method for the synthesis of monodisperse, high-load amount of platinum and gold cubic particles with cNT were composite structure. The obtained CNT / Pt composite material in having a large electric potential (0.5 V) and a higher oxygen reduction current for oxygen reduction reaction. In addition, we also proved that we designed synthetic universal. Synthesized platinum nano cubic particles and CNT composite structure of the polyelectrolyte membrane fuel cell cathode oxygen reduction reaction (0RR) display a high electrocatalytic activity, we want to be able to synthesize other special morphology precious metal nano-particles and CNT composites, in order to get a better electrocatalytic performance. Design a simple one-step reaction, carbon nanotubes directly grown ultrafine platinum Nanorods, the synthetic route does not require means of a template, a surface active agent or seed crystals may hinder the means of the surface active sites of the platinum particles. By detecting this composite structure as a proton exchange membrane fuel cell of the applicability of the catalyst, we find that, Pt nanorods / the CNT catalyst active surface area of ??about commercial Pt / c catalyst (0.5 mgpt cm, E.TEK) active surface area twice, and Pt nanorods / CNT catalyst platinum Lee Gang rate of 2371 mw mgpt-1, much higher than the commercial Pt / (: utilization of platinum catalyst 800 mw mgp ~~ From this we can conclude that the Conclusion nanorods we prepared Pt / CNT catalyst has more excellent than the commercial Pt / C the electrochemical catalytic performance. 4 iron oxide nanotubes is a representative of the one-dimensional magnetic materials, on the the tubular iron oxide nanostructures The synthesis method reported more, the method reported in higher requirements for the synthesis conditions and equipment, such as water thermal method, a sputtering method, etc., and controlling the morphology, size and yield of the product can not be achieved. Synthesis The limitations of the method will inevitably lead to the synthesis of iron oxide nanotubes is difficult to carry out the next step in the composite or applied research. designed Kirkendall mass transfer reason perish and interfacial reaction to the synthetic ferric hydroxide and iron oxide nanotubes at the same time, we study of the synthesized magnetite nanotubes in the field of magnetic resonance imaging. we found that commonly used in magnetic resonance imaging contrast agent 20 nmFe3O4 of nano-particles compared to the synthesis of Fe3O4 nanotubes to 107 SKBR-3 cells both before and after hatching shows better MRI T2 negative contrast next load of noble metal nanoparticles and related studies are underway.

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