Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/3980

Synthesis and optical properties of fullerene materials

Authors Leung, Shuk Mei
Issue Date 1996
Summary Fullerenes are wonder molecules that possess a range of exotic properties such as superconductivity, ferromagnetism, anti-HIV bioactivity and optical limiting effects. Synthesis of functionalized fullerene derivatives, polymers, and glasses is of great interest from viewpoints of both basic research and practical applications. We envision that fullerene materials may exhibit novel optical properties because of their intriguing three-dimensional conjugated molecular structures. In this study, we have synthesised a range of new fullerene materials and investigated their optical properties. We have successfully integrated C60 into solid matrixes of inorganic glasses and optical polymers through covalent bonding. We functionalized C60 by amination and then chemically incorporated C60 into a silica host using a sol-gel reaction. For C60-containing optical polymers, Several methods including free radical polymerization, Friedel-Crafts reaction, thermolysis and photolysis reactions were used to chemically incorporate C60 into PMMA, PS, PVC, PC and CR-39. All the C60-containing glasses and polymer films are morphologically homogenous with high optical quality and exhibit excellent optical limiting characteristics. Although C60 itself transmits light as normal as a common compound, surprisingly we have found that C60-containing glasses and optical polymers exhibit "abnormal" transmission characteristics. We can use the fullerene materials to cut off light of specific wavelengths over almost entire ultraviolet and visible spectral range by simply changing their C60 contents. The phenomenon is truly unusual, which can hardly be predicted from classical Beer's law. Since generation of light with precisely defined spectral characteristics is of fundamental importance, the novel light transmission property of the fullerene materials may find a wide variety of applications in the optical industry.
Note Thesis (M.Phil.)--Hong Kong University of Science and Technology, 1996
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Language English
Format Thesis
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