Raman identification of C70 monomers and dimers
2017 (English)In: Diamond & Related Materials, Elsevier; ISSN: 0925-9635: Special issue: Proceedings of the 10th International Conference on New Diamond & Nano Carbons, 2016 (NDNC 2016), Xi’an, China 2016 / [ed] Hong-Xing Wang, Chengming Li, Hongdong Li, Meiyong Liao, Zhenhui Kang, Nianjun Yang and Ping Yang, Elsevier, 2017, Vol. 73, 143-147 p.Conference paper (Refereed)
Fullerenes easily polymerize under high pressure by forming covalent intermolecular bonds. For C60 this reaction is easily monitored by Raman scattering, but for C70 no simple method to determine its bonding state is known. In this work C70 has been heated over a wide range of temperatures at a pressure of 1.6 GPa and the treated material has been studied by Raman spectroscopy, using 830 nm laser excitation to avoid photo-induced polymerization. By comparing the present data with earlier results for pure dimers, zig-zag chain polymers and pressure treated powders, characteristic fingerprint peaks can be found for the C70 monomer and the C140 dimer. The molecular stretching mode near 88 cm-1 is a clear fingerprint for dimers while the strong A1′ peak near 455 cm-1 clearly shows the presence of monomers. Several other new peaks appear in pressure-treated material and the relative intensities of many peaks change in a systematic way, but it is not clear whether these changes indicate the presence of dimers or of small oligomers in general. Simple strategies for semi-quantitative structural analysis of pressure-treated C70 material by Raman spectroscopy are briefly discussed.
Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 73, 143-147 p.
Fullerenes, C70, dimer, polymer, Raman scattering, Raman spectrum, high pressure, high temperature, lattice structure, intermolecular bonding, dimer stretch mode
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-133041DOI: 10.1016/j.diamond.2016.09.001OAI: oai:DiVA.org:umu-133041DiVA: diva2:1085601
10th International Conference on New Diamond & Nano Carbons, 2016 (NDNC 2016), Xi’an, China 2016