Measurements of polyphosphoric acid on HOPG
1988; Wiley; Volume: 152; Issue: 2 Linguagem: Inglês
10.1111/j.1365-2818.1988.tb01420.x
ISSN1365-2818
AutoresWataru Mizutani, Masatsugu Shigeno, Kazuhiro Saito, Naotake Morita, Toru Yoshioka, Masatoshi Ono, Koji Kajimura,
Tópico(s)Mechanical and Optical Resonators
ResumoSUMMARY As a sample for initial study on biological materials by using scanning tunnelling microscope (STM), we selected phosphoric acid consisting of phosphorous atoms which play biologically an important role. We measured polyphosphoric acid coated on HOPG by STM and scanning tunnelling spectroscopy (STS) in air. In order to identify molecules on STM images, local I‐V curves were taken simultaneously. The averaged I‐V curves and the normalized conductance spectra of graphite coated with the acid show characteristics different from those of clean graphite surface. Around a step of the substrate, we found domains where normalized conductance spectra were different from those of clean graphite surface and ascribable to that of the adsorbed molecules.
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