Photochemically Triggered Alkylthiol Reactions on Highly Ordered Pyrolytic Graphite

Extinction of ferromagnetism in highly ordered pyrolytic graphite by annealing

We report that the ferromagnetism of highly ordered pyrolytic graphite (HOPG) samples as measured by hysteretic magnetization loops can be diminished and eventually extinguished with sufficiently long high vacuum anneals at temperatures on the order of 2300 !C. Concomitant with the extinction of ferromagnetism, we observe an annealinduced increase in grain size (accompanied by possible edge rec...

Experimental Studies on Plasmon Resonance of Ag Nanoparticles on Highly Ordered Pyrolytic Graphite (HOPG)

Scanning tunneling microscopy studies of carbon-oxygen reactions on highly oriented pyrolytic graphite

The oxidation of highly oriented pyrolytic graphite (HOPG) in air at elevated temperatures was studied by examination of the oxidized HOPG by scanning tunneling microscopy (STM). Etch pits of uniform size and monolayer depth were readily formed on preexisting defects or generated vacancies in the HOPG basal plane by heating freshly cleaved HOPG samples in air at 650 OC. The density of the pits ...

UFM observation of lattice defects in highly oriented pyrolytic graphite

Ultrasonic force microscopy (UFM) can be used to image the distribution of elastic modulus up to several tens of GPa, which is not possible by the force modulation mode using a soft cantilever of spring constant less than 1 N m‘. It was shown that by careful design of a piezoelectric transducer, together with a sample with small friction force, deflection vibration of the cantilever without tor...

Nucleation and Growth of Nanoscale to Microscale Cylindrical Pits in Highly-ordered Pyrolytic Graphite upon Hyperthermal Atomic Oxygen Exposure

The erosion of highly-ordered pyrolytic graphite (HOPG) caused by exposure to hyperthermal atomic oe p) atoms was explored. Profilometry has revealed that the overall erosion yield is linear with respect to increasing atomic oxygen exposure at a constant sample temperature of 373 K. Atomic force microscopy (AFM) was employed to image the eroded material that contains numerous nanoscale to micro...