Composite films of graphene oxide with semiconducting carbon nanotubes: Raman spectroscopy characterization
N. V. Kurnosov and V. A. Karachevtsev
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
Received October 16, 2020, published online January 26, 2021
Noncovalent interaction between semiconducting single-walled carbon nanotubes (SWNTs) and graphene oxide (GO) in composite films (GO-SWNTs) was analyzed by Raman spectroscopy in the range of D and G modes (1170–1780 cm–1). Comparison between Raman spectra of composite film and single-component GO and SWNTs films showed that the interaction between GO and SWNTs is accompanied by a band broadening and spectral shifting. Observed spectral transformations are attributed to charge transfer between GO and SWNTs as well as a deformation of carbon surfaces which occurs in the composite. Spectral measurements of composite GO-SWNTs film with biological globular molecules (the enzyme glucoseoxidase) showed that these molecules weaken mechanical stress of GO on the nanotubes.