The electron transfer (ET) kinetics of three redox couples in aqueous solution, IrCl6(2-/3-), Ru(NH3)6(3+/2+) and Fe(CN)6(4-/3-), on different grades of highly oriented pyrolytic graphite (HOPG) have been investigated in a droplet-cell setup. This simple configuration allows measurements to be made on a very short time scale after cleavage of HOPG, so as to minimise possible effects from (atmos...

We report that the substrate-free gas-phase graphene synthesis method produces clean and highly ordered graphene sheets that are similar in quality to the graphene obtained through the mechanical exfoliation of highly oriented pyrolytic graphite.

A magnetic-field-driven transition from metallicto semiconducting-type behavior in the basal-plane resistance takes place in highly oriented pyrolytic graphite at a field Hc ∼ 1 kOe applied along the hexagonal c-axis. The analysis of the data reveals a striking similarity between this transition and that measured in thinfilm superconductors and Si MOSFET’s. However, in contrast to those materia...

A stable Fe(4-TMPyP)-DNA-PADDA (FePyDP) film was characterized on pyrolytic graphite electrode (PGE) or an indium-tin oxide (ITO) electrode through the supramolecular interaction between water-soluble iron porphyrin (Fe(4-TMPyP)) and DNA template, where PADDA (poly(acrylamide-co-diallyldimethylammonium chloride) is employed as a co-immobilizing polymer. Cyclic voltammetry of FePyDP film showed ...

Standard rate constants (k,) for interfacial electron transfer (ET) have been obtained for several redox couples featuring very small internal activation barriers. To render these ordinarily fast rates more easily measurable, we have employed low-defect-density, highly ordered pyrolytic graphite (HOPG) as an electrode material (see: Allred and McCreery, Anal. Chem. 1992,64,444). At the HOPG/aqu...