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Process for purification and evaporation of C60 metallo-endohderal material

Methods were developed for purifying endohedral metallo-C60 molecules using high performance liquid chromatography. Techniques were developed involving complex chemical washing procedures to produce the pure molecules. These results have been published in the open literature. The success of the purification process was characterised using spectroscopical methods such as IR, Raman and UV-vis and by laser desorption mass spectrometry. The Li@C60 material could be extracted and purified using these HPLC and chemical washing techniques and was distributed to the project partners.

The extraction and purification was less successful for the higher alkalis although a small amount of purified material was produced. This can be partially attributed to the higher degree of material damage and polymerisation that occurs at the energies needed to produce the endohedral fullerenes and in the smaller probability of implantation to occur.

The optimum conditions for evaporation of the purified molecules were tested and determined. The main aim was to provide material that could be evaporated under UHV conditions to form sub-monolayers or thicker films of purified endohedral fullerene molecules for electrical characterisation. The highly purified material was found to be extremely unstable under typical evaporation conditions.

The deposited endohedral C60 molecules showed a strong and rapid degradation in electrical properties after deposition. The more stable La@C82 material showed a slower but still significant degradation in conductivity.

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Göteborg University
School of Physics and Engineering Physics, Gothenburg University
41296 Göteborg