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Structure, Stability, And Electronic Interactions Of Polyoxometalates On Functionalized Graphene Sheets, Jean-Philippe Tessonnier, Stephanie Goubert-Renaudin, Shaun Alia, Yushan Yan, Mark A. Barteau
Structure, Stability, And Electronic Interactions Of Polyoxometalates On Functionalized Graphene Sheets, Jean-Philippe Tessonnier, Stephanie Goubert-Renaudin, Shaun Alia, Yushan Yan, Mark A. Barteau
Jean-Philippe Tessonnier
Polyoxometalates (H3PMo12O40, H 3PW12O40, H4PMo11VO 40) supported on oxygen- and alkyl-functionalized graphene sheets were investigated. Discrete molecular species were directly observed by electron microscopy at loadings below 20 wt.%. The interaction between the polyoxometalates and the graphene surface was found to significantly impact their vibrational spectra and a linear correlation between the frequency of the M-Oc-M vibration and the dispersion was evidenced by FTIR. While bulk-like electronic properties were observed for small aggregates (2-5 nm), UV-vis spectroscopy and cyclic voltammetry revealed changes in the electronic structure of isolated molecular species as a result of their interaction with graphene. Because of …
Dispersion Of Alkyl-Chain-Functionalized Reduced Graphene Oxide Sheets In Nonpolar Solvents, Jean-Philippe Tessonnier, Mark A. Barteau
Dispersion Of Alkyl-Chain-Functionalized Reduced Graphene Oxide Sheets In Nonpolar Solvents, Jean-Philippe Tessonnier, Mark A. Barteau
Jean-Philippe Tessonnier
Alkyl chains were grafted onto reduced graphene oxide sheets to allow their dispersion in toluene, a common and representative nonpolar solvent. The grafting occurred on a variety of oxygen-containing functionalities already present on reduced graphene oxide, such as hydroxyl and epoxide groups. The structure and the defect density of the sheets were not significantly altered during the synthesis. When dispersed in water-toluene mixtures, phase transfer from the aqueous to the organic phase was observed upon grafting. In addition, the dry powder obtained readily disperses in common organic solvents without the assistance of any sonication treatment.