Tunneling microscopy on various carbon materials

Scanning tunneling microscopy images of the surfaces of graphite, glassy carbon, pyrolyzed perylene tetracarbolic acid dianhydride, pyrolyzed C5Br6, and hydrogenated carbon were made. A new periodic structure was found on graphite whose size was ∼240 Å on a side and whose height was 7 Å. The structure is made of an integral number of surface waves whose wavelength is 15 Å. The glassy carbon and carbon films had graphitelike regions extending up to 20 Å and round structures were observed on the pyrolyzed C5Br6 film. The hydrogenated carbon films showed a filamentlike structure with essentially no graphitelike regions.