Studies Of Fluorescence Of Fullerene And Photoelectric Properties Of Fullerene Modified Blm

There is three dimensional conjugation of the n electron system in C60 , which makes it possible to observe the strong fluorescence from C60- However, the fluorescence quantum yield of C60 is very low, especially the very weak fluorescence of C60 in r oom-temperature solutions, which i s not only due to the intersystem c rossing from singular state to the excited triplet state, but also the forbidden electronic transitions between the excited singular states and ground state. It is necessary to study the fluorescence spectrum and luminescence mechanism of C60, as C60 has the potential of being a new photosensitive and luminescent material.C60 molecule has a unique hydrophobic dynamic feature and it is also a good electron carrier. So the C60 modified BLM provides the great possibility of the development of a new generation of biologic sensors and electronic devices. Therefore, study of photoelectric and properties of C60 modified BLM has the great significance.In this thesis, fluorescence spectra for C60 in toluene, C S2, DMSO and pyridine solutions at room temperature have been studied. And the photoelectric properties of C60 modified BLM have also been discussed. A series of novel and challenging results have been obtained:1. The intensity and quantity of fluorescence peaks of C60 in room-temperature solutions are dependent on the interaction between C60 and solvent. The solvent possessing i solated e lectrons c ould make a strong interaction w ith C60. The r educed symmetry o f C60 m olecule d ue to the interaction induces s trong fluorescence p eaks. This provides an approach to the observation of strong fluorescence of C60 and the great possibility of the fabrication of novel fullerene-based luminescent materials.2. We first obtained the high-quality fluorescence spectrum of C60 in C60-pyridinesolution at room temperature. Compared with the former reports, this is the strongest and the most w ell-resolved recorded fluorescence spectra o f C60 in room-temperature solutions.3. The interaction between C60 and pyridine is a kind of adduction through charge transfer which is proved further by electroreduction of C60 in pyridine as well as surface-enhanced Raman scattering (SERS) spectrum of C60.We also have proved that C60 molecule may make only a physical interaction with pyridine and does not substantively react chemically with pyridine.4. Three electrochemical' methods, cyclic voltammetry, chronoamperometry and open-circuit potential were used to monitor the changes of electronic parameters of the ITO (indium-tin oxide) conducting glass supported BLM system, which is favorable for studying the dynamic process of BLM forming.5. Some improvements have been made for the BLM forming solution, which make BLM close to biologic membrane in the structure and the ingredients. The experimental results showed that stability of lipid membrane is increased using this improved BLM forming solution.6. At last, we prospected for further molecular spectroscopic research of ITO/BLM system.