Tuning Electronic and Magnetic Properties in Graphene Oxide – Porphyrins Complexes

Abstract

Graphene oxide (GO) was modified by two modified porphyrins (THPP and TCPP) to formGO–porphyrin hybrids. Spectroscopic measurements demonstrated the formation of stablesupramolecular aggregates when mixing two components in solution. The Fouriertransform infrared (FTIR) and Raman scattering measurements confirm π-stackingbetween hydrophobic regions of GO nanoflakes and porphyrin molecules. An interesting interplay between modifiers andthe surface of GO leads to a significant change in electronic structure and magneticproperties of the designed hybrid materials. Based on the selection of molecularcounterpart 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.

Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars

“…The FT-IR spectra of the graphene oxide (GO) and of the silanized graphene oxide (GO-APTES), ranging between 4000-500 cm −1 are shown in Figure 2. In the GO spectrum, one could observe a large absorption band with three peaks at 3338 cm −1 and 3197 cm −1 assigned to the stretching vibration of the C-H and O-H bnd [18] and at 2854 cm −1 corresponding to the C-H stretching vibrations [19]. In the GO-APTES spectrum there is also a large absorption band with one peak at 2933 cm −1 that can be assigned to the C-H bond vibration from the CH2 or CH3 group [20] The smaller peak at 2360 cm −1 can be attributed to the stretching vibration of the C-H bond [21].…”

Low Blue Dose Photodynamic Therapy with Porphyrin-Iron Oxide Nanoparticles Complexes: In Vitro Study on Human Melanoma Cells

“…The IR spectra of TPPS presents the characteristic vibrations of the TPPS ring and the four SO 3 − groups connected to the molecule phenyl moiety [42][43][44][45]. The N-H stretching vibration is identified at 3196 cm −1 and 3133 cm −1 and C-H stretching vibration is observed at 3056 cm −1 and 2907 cm −1 .…”

“…Figure 8 displays the FT-IR spectra of TPPS, γ-Fe2O3 NPs, and complex γ NPs_TPPS. The characteristics IR vibration of TPPS molecule were identified based existing literature [42][43][44][45] and the calculation molecular structure using Gaus software. Table 4 presents the vibrational extracted from the experimental and theo spectra and their corresponding mode of vibration.…”

“…Table 4 presents the vibrational extracted from the experimental and theo spectra and their corresponding mode of vibration. The characteristics IR vibration of TPPS molecule were identified based on the existing literature [42][43][44][45] and the calculation molecular structure using Gaussian09 software. Table 4 presents the vibrational extracted from the experimental and theoretical spectra and their corresponding mode of vibration.…”