Interactions between Single-Walled Carbon Nanotubes and Tetraphenyl Metalloporphyrins: Correlation between Spectroscopic and FET Measurements

High Resolution Image Download MS PowerPoint Slide The noncovalent functionalization, or complexation, of single-walled carbon nanotubes (SWNTs) with metallo-tetraphenyl porphyrins (M-TPPs) was monitored with UV−vis−NIR absorption spectroscopy and electroanalytical measurements using nanotube field-effect transistors (NTFETs). From combining both techniques, we have found that M-TTPs donate electron density exclusively into semiconducting SWNTs. Moreover, thin-film UV−vis−NIR absorption spectroscopy on SWNT/M−TPP complexes provides a well-resolved picture of the interaction between the SWNT S 1 band and the electron-donating M−TPP. In total, the electron-donating properties of four different M-TPPs containing Mn(III), Co(II), Cu(II), and Zn(II) were compared, and the electronic affects of each are discussed.