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94. Ion implantation into HOPG
Abstracts
135
and A. H&old (~boraf~jre de Chimie du So&de Mb&al, Associe’ au CNRS LA 158, Universitk de Nancy iCO 140-54037 Nancy Cedex, France). The graphiteHNO$ lamellar compounds have high chemical stability and a smaller interlayer distance di = 6.55 A, than in normal graphite-nitrate (G.NH03a) for which di = 7.80 ii. Various stages 2 s n c 10 are easily synthetized. Results are presented concerning thermal analysis, the stage structure by X-ray diffraction (001 and hkl) and the electrical conductivity versus stage and temperature.
and LRSM, University of Pennsylvania, Philadelphia, PA 19104). We have recently demonstrated the usefulness of ion-implantation as a technique for the modification of covalent materials. We have extended our studies to include graphite and the results of implantation of Na”, F’ and Cl+ ions into the C face of HOPG will be presented. Preliminary optical reflectance studies indicate metallic type behavior is present in the F’ implanted graphite+XPS data will also be presented.
91. Action of ~t~s~hyd~ge~~ate
95. Low-energy electron d~raction resnita for ~~gen mofecufesphys~r~ on graphite Renee D. Diehl, Michael F. Toney and Samuel C. Fain, Jr. (Department of Physics, University of Washington, Seattle, WA 98195). Low-energy electron diffraction (LEED) observations for nitrogen molecules physically adsorbed on the basal plane of graphite crystals are reported for lOK< T< 55K and P < 10.-“Torr. The orientational ordering of the nitrogen molecular axes at T < 30K produces a new LEED pattern which indicates formation of a 2 x 1 superlattice in the registered (d3 X q3)30” structure.
on graphite and
D. Billaudi (university of Pennsylvania, Moore School of Electrical Engineering, Philadelphia, PA 19104) and A. Pro4 (University of Pennsylvania, Department of Chemistry, Philadelphia, PA 19104). Nitrosylhydrogensulfate (NOHSO,) dispersed in dry nitromethane reacts with graphite and polyacetylene to give highly conducting acceptor type compounds. Nitrosyl ion NO’ acts as an oxidizing agent of graphite or polyacetylene leading to the intercalation or doping of the bisulfate anion HSOe-. Characterization by X-ray diffraction and electrical conductivity has been effected. TPermanent address: Laboratoire de Chimie Mintrale Ap-
.ok&e. . ~-.LA 158.C.O. 140-54037Nancv Cedex. France. /Permanent address: Institut of General Chemistry and Inorganic Technology, Warszawa, Poland.
92. Intercalation compounds as precursors for oriented catalysts: the MoOsaphite system in propylene oxidation J. C. Volta (Institut de Recherches sur la CatalyseC.N.R.S. 2 Avenue A. Einstein 69626 Villeurbanne Ckdex, France). The OxyhydroIysis of a MoCl~-~aphite intercalation compound gives oriented Mood-~aphite catalysts. By controlling the parameters of the oxyhydrolysis treatment (temperature increase, final isothermal temperature), it is possible to change the repartition of the crystalline faces of the nucleated MOO, grains at the surface of graphite and thus to modify the catalytic;.properties of the solids in propylene mild oxidation. 93. Intercalation of graphite with the adducts of nitrosyl chforide and metal chlorides Kam Leong, W. C. Forsman and F. L. Vogel (School of ~nginee~ng, ~niuersjty of Pennsylvania, Philadelphia, PA f9lO4). Nitrosyl chloride forms liquid adducts with ferric and aluminum chlorides. Both compounds have been used successfully to intercalate graphite giving acceptor compounds having enhanced electrical conductivity. There is clear evidence that the molecular liquids enter the lattice along with the ionic species. P4. IOUimplantation into HOPG D. C. Weber, P. Brant and M. J. Moran (Chemistry Division, Code 6130, Naval Research Laboratory, Washington, X20375) and J. E. Fischer and M. Preil (Moore School of Electrical Engineering and Science, CAR Vol. 20. No. 2-D
96. any mechanicalsecond vfrfafcoefficientof helium adsorbedon graphite Guo Zhi-Chun and L. W. Bruch (Physics Department, University of Wisconsin, Madison, WI53706). The quantum mechanical second virial coefficient at temperatures of OS-10K has been calculated with a realistic helium pair potential supplemented by effective interactions fron substrate-mediated dispersion forces and helium vibrations perpendicular to the graphite surface. Effects of the periodic helium-graphite potential are discussed. 97. Ceaium sorption kinetics of bulk and partway graphite at 1OWC L. R. Zumwalt and N. I. Kazi (North Carolina State University, Department of Nuclear Engineering, Raleigh, NC 27650). In studies of the sorption and desorption of cesium by a nuclear-grade graphite at lOOO”C,data for particulate samples fit a theoretical kinetics equation very well. Solid sample data fit reasonably, but less well at the initial and final periods of the runs. Reasons for the differences are proposed. 98. Orientational ordering in methane fifms physfsorbed on graph&esurface Aldo Migone, James R. Boyer and M. H. W. Chan (The Pennsylvania State university, University Park, PA 16802). We present measurement of the heat capacity of methane films physisorbed on exfoilated graphite. Thickness of the film ranges from submonolayer to 8 layers. The heat capacity peak associated with orientational ordering was found to shift to lower temperature and flatten as the film thickness is reduced. 99. 2-D phase trausition and helium layer formatfon on grafoil foam J. A. Roth, G. f. Jelatis and J. D. Maynard (The
135
and A. H&old (~boraf~jre de Chimie du So&de Mb&al, Associe’ au CNRS LA 158, Universitk de Nancy iCO 140-54037 Nancy Cedex, France). The graphiteHNO$ lamellar compounds have high chemical stability and a smaller interlayer distance di = 6.55 A, than in normal graphite-nitrate (G.NH03a) for which di = 7.80 ii. Various stages 2 s n c 10 are easily synthetized. Results are presented concerning thermal analysis, the stage structure by X-ray diffraction (001 and hkl) and the electrical conductivity versus stage and temperature.
and LRSM, University of Pennsylvania, Philadelphia, PA 19104). We have recently demonstrated the usefulness of ion-implantation as a technique for the modification of covalent materials. We have extended our studies to include graphite and the results of implantation of Na”, F’ and Cl+ ions into the C face of HOPG will be presented. Preliminary optical reflectance studies indicate metallic type behavior is present in the F’ implanted graphite+XPS data will also be presented.
91. Action of ~t~s~hyd~ge~~ate
95. Low-energy electron d~raction resnita for ~~gen mofecufesphys~r~ on graphite Renee D. Diehl, Michael F. Toney and Samuel C. Fain, Jr. (Department of Physics, University of Washington, Seattle, WA 98195). Low-energy electron diffraction (LEED) observations for nitrogen molecules physically adsorbed on the basal plane of graphite crystals are reported for lOK< T< 55K and P < 10.-“Torr. The orientational ordering of the nitrogen molecular axes at T < 30K produces a new LEED pattern which indicates formation of a 2 x 1 superlattice in the registered (d3 X q3)30” structure.
on graphite and
D. Billaudi (university of Pennsylvania, Moore School of Electrical Engineering, Philadelphia, PA 19104) and A. Pro4 (University of Pennsylvania, Department of Chemistry, Philadelphia, PA 19104). Nitrosylhydrogensulfate (NOHSO,) dispersed in dry nitromethane reacts with graphite and polyacetylene to give highly conducting acceptor type compounds. Nitrosyl ion NO’ acts as an oxidizing agent of graphite or polyacetylene leading to the intercalation or doping of the bisulfate anion HSOe-. Characterization by X-ray diffraction and electrical conductivity has been effected. TPermanent address: Laboratoire de Chimie Mintrale Ap-
.ok&e. . ~-.LA 158.C.O. 140-54037Nancv Cedex. France. /Permanent address: Institut of General Chemistry and Inorganic Technology, Warszawa, Poland.
92. Intercalation compounds as precursors for oriented catalysts: the MoOsaphite system in propylene oxidation J. C. Volta (Institut de Recherches sur la CatalyseC.N.R.S. 2 Avenue A. Einstein 69626 Villeurbanne Ckdex, France). The OxyhydroIysis of a MoCl~-~aphite intercalation compound gives oriented Mood-~aphite catalysts. By controlling the parameters of the oxyhydrolysis treatment (temperature increase, final isothermal temperature), it is possible to change the repartition of the crystalline faces of the nucleated MOO, grains at the surface of graphite and thus to modify the catalytic;.properties of the solids in propylene mild oxidation. 93. Intercalation of graphite with the adducts of nitrosyl chforide and metal chlorides Kam Leong, W. C. Forsman and F. L. Vogel (School of ~nginee~ng, ~niuersjty of Pennsylvania, Philadelphia, PA f9lO4). Nitrosyl chloride forms liquid adducts with ferric and aluminum chlorides. Both compounds have been used successfully to intercalate graphite giving acceptor compounds having enhanced electrical conductivity. There is clear evidence that the molecular liquids enter the lattice along with the ionic species. P4. IOUimplantation into HOPG D. C. Weber, P. Brant and M. J. Moran (Chemistry Division, Code 6130, Naval Research Laboratory, Washington, X20375) and J. E. Fischer and M. Preil (Moore School of Electrical Engineering and Science, CAR Vol. 20. No. 2-D
96. any mechanicalsecond vfrfafcoefficientof helium adsorbedon graphite Guo Zhi-Chun and L. W. Bruch (Physics Department, University of Wisconsin, Madison, WI53706). The quantum mechanical second virial coefficient at temperatures of OS-10K has been calculated with a realistic helium pair potential supplemented by effective interactions fron substrate-mediated dispersion forces and helium vibrations perpendicular to the graphite surface. Effects of the periodic helium-graphite potential are discussed. 97. Ceaium sorption kinetics of bulk and partway graphite at 1OWC L. R. Zumwalt and N. I. Kazi (North Carolina State University, Department of Nuclear Engineering, Raleigh, NC 27650). In studies of the sorption and desorption of cesium by a nuclear-grade graphite at lOOO”C,data for particulate samples fit a theoretical kinetics equation very well. Solid sample data fit reasonably, but less well at the initial and final periods of the runs. Reasons for the differences are proposed. 98. Orientational ordering in methane fifms physfsorbed on graph&esurface Aldo Migone, James R. Boyer and M. H. W. Chan (The Pennsylvania State university, University Park, PA 16802). We present measurement of the heat capacity of methane films physisorbed on exfoilated graphite. Thickness of the film ranges from submonolayer to 8 layers. The heat capacity peak associated with orientational ordering was found to shift to lower temperature and flatten as the film thickness is reduced. 99. 2-D phase trausition and helium layer formatfon on grafoil foam J. A. Roth, G. f. Jelatis and J. D. Maynard (The