Abstract
Graphene oxide (GO) was modified by two modified porphyrins (THPP and TCPP) to form GO–porphyrin hybrids. Spectroscopic measurements demonstrated the formation of stable supramolecular aggregates when mixing two components in solution. The Fourier transform infrared (FTIR) and Raman scattering measurements confirm π-stacking between hydrophobic regions of GO nanoflakes and porphyrin molecules. On the number and the kind of paramagnetic centers generated in pristine GO samples, which originate from spin anomalies at the edges of aromatic domains within GO nanoflakes. More significant changes in electronic properties have been observed in hybrid materials. This is particularly evident in the drastic increase in the number of unpaired electrons for the THPP-GO sample and the decrease in the number of unpaired electrons for the TCPP-GO. The difference of paramagnetic properties of hybrid materials is a consequence of π-stacking between GO and porphyrin rings. An interesting interplay between modifiers and the surface of GO leads to a significant change in electronic structure and magnetic properties of the designed hybrid materials. Based on the selection of molecular counterpart we can affect the behavior of hybrids upon light irradiation in a different manner, which may be useful for the applications in photovoltaics, optoelectronics, and spintronics.
Highlights
The strong band at 422 nm for THPP and at 418 nm for TCPP was assigned to the Soret band arising from the transition to the second excited state (S0 → S2) and the other four absorption maxima at 518, 556, 595, and 652 nm for THPP; 514, 549, 589, and 645 nm for TCPP were attributed to the Q bands corresponding to weak transition to the first excited state (S0 → S1)
These results clearly indicate that the THPP and TCPP molecules have been non-covalently bonded to the graphene oxide by π–π stacking and are not engaged in any other interaction
We successfully developed a simple and effective method for preparing porphyrin-GO hybrids that have donor-acceptor properties and are characterized by the charge transfer between porphyrin and graphene oxide
Summary
It is transparent like (or better than) plastic, but conducts heat and electricity better than any metal, it is an elastic film, behaves as an impermeable membrane, and it is chemically inert and stable [1]. Under ultrasonic treatment in polar solvents and in the presence of bases it can be exfoliated and dissolved [2]. This new material is usually called graphene oxide (GO). It consists of single nanoflakes of graphene highly decorated with oxygen-containing functional groups. This material, upon deposition on solid substrates shows
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
