Fullerene films with suppressed polymerizing ability
Abstract
Illumination of fullerene with visible light in the presence of oxygen leads to a transition of oxygen from triplet (ground) to singlet (excited) state where singlet oxygen is a long-lived reactive oxygen species. The effectiveness of fullerene as a singlet oxygen generator drastically decreases when fullerenes are condensed into a bulk material, mainly due to the polymerization ability. The ability of fullerene films to polymerize was studied for the C60 fullerene films intercalated with tetraphenylporphyrine (TPP), CdS, CdTe, HNO3 as well as the hydrogen plasma treated films. Raman spectroscopy was used for monitoring the polymerization process. The ability to polymerize was found to be tightly connected to the formation of charge-transfer (Wannier-Mott) excitons which are revealed in the absorption spectra and measured with the help of spectroscopic ellipsometry.
Keywords
Fullerene,
CdS,
CdTe,
HNO3,
tetraphenylporphyrine,
hydrogen plasma,
Raman spectroscopy,
spectroscopic ellipsometry,
polymerization
Supporting agencies: The work is supported by the EU FP7 Marie Curie IRSES Project 269138 “NanoGuard”.
About the Authors
M. Yesilbas
Umea University
Sweden
Sweden
90187 Umea
T. L. Makarova
Umea University; Ioffe Physico-technical Institute
Sweden
Sweden
90187 Umea; 194021 St. Petersburg
I. Zakharova
State Technical University
Russian Federation
Russian Federation
195251 St. Petersburg
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For citations:
Yesilbas M., Makarova T.L., Zakharova I. Fullerene films with suppressed polymerizing ability. Nanosystems: Physics, Chemistry, Mathematics. 2014;5(1):53-61.
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