The far-ultraviolet (FUV) region, which is the region of 120-300 nm, provides unique information about the electronic transitions and structure of a molecule. We have recently succeeded in measuring electronic spectra of graphene, carbon nanotubes, and polymer nanocomposites down to 150 nm using a newly developed attenuated total reflection (ATR)-UV spectrometer. The spectra of graphene show a thickness dependence. A thin graphene sample with the thickness of 1-2 nm shows a small peak near 155 nm. Single-wall carbon nanotubes with the thickness of 1-2 nm yields a similar peak. We investigate band assignments for these peaks including theoretical calculation. In the case of polymer nanocomposites a polymer gives rise to major peaks below 200 nm while nano carbon part does not show a peak in the whole region because the content of nanocarbon is very small compared with the polymer. We compared an FUV-DUV spectrum of PHB (poly(hydroxybutyrate))-graphene nanocomposites with that of PHB. A peak near 171 nm shows a longer wavelength shift by ca. 2 nm upon the formation of nanocomposites, indicating a change in electronic structure in the polymer. We investigate the cause of the shift by using quantum chemical calculations.
Kenta Kobashi, Yusuke Morisawa, Krzysztof Bec, Ichiro Tanabe, Masahiro Ehara, Harumi Sato, and Yukihiro Ozaki, "FUV-DUV spectra of graphene, carbon nanotubes, and polymer nanocomposites (Conference Presentation)," Proc. SPIE 10351, UV and Higher Energy Photonics: From Materials to Applications 2017, 1035108 (Presented at SPIE Nanoscience + Engineering: August 06, 2017; Published: 29 September 2017); https://doi.org/10.1117/12.2273496.5593127443001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon