Metal ion effect on the supramolecular structures of metalloporphyrins on single-walled carbon nanotube surface

• Published in: Applied surface science 2018-12, Vol.462, p.904-912
• Main Authors: El-Mageed, Ahmed I. A. Abd, Ogawa, Takuji
• Format: Article
• Language: English
• Subjects: Metal ion effect; metalloporphyrins; Scanning tunneling microscopy; Single-walled carbon nanotube; Supramolecular structures
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.08.177

[Display omitted] •The single-walled carbon nanotubes (SWNTs) were non-covalently functionalized with Zn, Ni and Co-Porphyrins.•Using scanning tunneling microscopy (STM), different supramolecular structures have been observed on the SWNT surface.•The absorption spectra of metalloporphyrins shows clear shifting after complexation with SWNT. In this study, supramolecular structures of metalloporphyrin derivatives, i.e., Zn, Co, and Ni on a single-walled carbon nanotube (SWNT) surface have been investigated using microscopic and spectroscopic measurements as well as density functional theory calculations, to identify the effect of metalation on the supramolecular structures of porphyrins on a curved carbon surface (SWNT). By changing the central metal incorporated inside the porphyrin ring, different supramolecular structures can be observed on the SWNT surface using scanning tunneling microscopy, which displays the effect of different metal centers on the supramolecular structure. Although predicting or understanding supramolecular structures on the SWNT surfaces is still a big challenge, this study will serve as a helpful key point for further understanding, building new supramolecular architectures on SWNT surfaces and designing novel molecular architectonics of porphyrin/SWNTs-based devices.