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Measurements of polyphosphoric acid on HOPG
Author(s) -
Mizutani Wataru,
Shigeno Masatsugu,
Saito Kazuhiro,
Morita Naotake,
Yoshioka Toru,
Ono Masatoshi,
Kajimura Koji
Publication year - 1988
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1988.tb01420.x
Subject(s) - graphite , conductance , phosphoric acid , scanning tunneling microscope , molecule , substrate (aquarium) , materials science , adsorption , spectral line , microscope , quantum tunnelling , spectroscopy , analytical chemistry (journal) , chemical physics , nanotechnology , chemistry , optics , condensed matter physics , organic chemistry , optoelectronics , physics , composite material , oceanography , astronomy , geology , metallurgy , quantum mechanics
SUMMARY 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.