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Preparation and Charation of Transition Metal Incorporated Fullerene C60Micro/Nanomaterials

Author: NiuNaNa
Tutor: PuGuangZhe
School: Qingdao University of Science and Technology
Course: Materials Science
Keywords: fullerene micro/nanomaterials the incorporation of transition metal electron holography
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Type: Master's thesis
Year: 2013
Downloads: 2
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Abstract


Low-dimensional fullerene C6o micro/nanomaterials have received extensively attention due to their unique electron transport behavior, optical and physical properties, mechanical properties and their possible application in various fields like integrated circuits such as micro/nanometer optoelectronic devices, and functional components. And fullerene micro/nanomaterials form a wide variety of donor-acceptor complexes with different classes of organic and organometallic donors, so modification is very important and necessary, and hybrid of the low-dimensional fullerene C6o micro/nanomaterials is proved to be one of the hotspots of fullerene micro/nanomaterials science.Recently, more and more methods have been used to prepare fullerene micro/nanostructure, and the liquid-liquid interfacial precipitation (LL1P) method, which is simple, high reproducibility and low cost, has been identified as an effective method for the precipitation of fullerene micro/nanostructures. At this juncture, it would be appropriate to introduce transition metal-incorporated fullerene micro/nanomaterials prepared by using the LLIP method.In this paper, we succeeded in preparing Ni-incorporating fullerene C6o micro/nanofibers by LLIP method. In the system, we used carbon disulfide (CS2) as the good solvent for fullerene C60, isopropyl alcohol (IPA) as the poor solvent for C60, and Ni(NO3)2·6H2O as metal-ions precursors of Ni, which has been dissolved into IPA. The SEM image and EDS mapping analysis reveal that the formation of micro/nanofibers with fine dispersion of Ni atoms in the micro/nanofibers and confirms the presence of Ni atoms and C atoms in the micro/nanofibers.We also prepared transition metal incorporated fullerene micro/nanomaterials by using benzene, m-xylene and CS2as the good solvent respectively, IPA as the poor solvent, and FeCl3·6H2O as the metal-ions precursors of Fe. However, it is found that the producibility of incorporating transition metal on the micro/nanofibers is very low.In order to improve the producibility of incorporating transition metal, we selected organic metal complexes as the precursors of metal-ions for the incorporation of transition metal to solve the low repeat rate. In this chapter, we succeed prepared C60/ferrocene (Fc) microsheets used Fc as the precursor of Fe by LLIP method, and fully characterized by means of Optical microscope, SEM, EDS, IR and Raman spectra. The highly crystallized C60/Fc microsheets with approximated hexagonal shape had a size of10μm. The Optical microscope and SEM images of C60/Fc microsheets showed the hexagonal morphology of the sheets. And EDS mapping confirms the fine dispersion of iron atoms in the microsheets, indicating that the microsheets are C60/Fc microsheets. The IR and Raman spectra of the prepared C60/Fc microsheets indicate that the microsheets contain C60and Fc.In this paper, we introduce a new way to deposit transition metal on fullerene micro/nanofibers by plasma sputtering technology.The successful preparation of transition metal incorporated fullerene micro/nanomaterials made it possible to be widely used. However, with the development of science and technology, tiny devices require to be integrated with nanosized components, and many fundamental properties of micro/nanomaterials have strong dependence on size and shape. So, accurate measurements of the shape and diameters of micro/nanomaterials are very important and demanded. Though there have been several methods for size-measurement of micro/nanomaterials such as spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). However, there are some disadvantages in these methods, for example, indirect or inaccurate. In electron microscopy observations, SEM could only provide the surface information with limited resolution, and the traditional TEM imaging could hardly provide intuitive3-dimentioal information. When the sample has a complex morphology such as hollow structure, traditional TEM techniques are difficult to reveal the configuration. In this paper, we report that the electron holography could act as a method of the inner diameter calculation and shape visualization of micro/nanomaterials when their shapes are regular. Here C6o nanotubes and nanowhiskers were taken as examples; the inner and outer diameters were measured from the phase profiles. The shape of the inner wall was estimated and the mean inner potential (MIP) was also calculated using the measured diameter values.

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