ATOMIC IMAGES OF SATURATED AND UNSATURATED FATTY-ACIDS AT LIQUID/GRAPHITE INTERFACE AND DIFFERENCE OF TUNNELING CURRENTS BETWEEN THEM OBSERVED BY SCANNING-TUNNELING-MICROSCOPY

被引:68
作者
HIBINO, M
SUMI, A
HATTA, I
机构
[1] Department of Applied Physics, School of Engineering, Nagoya University, Nagoya, 464-01, Furo-cho, Chikusa-ku
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1995年 / 34卷 / 2A期
关键词
FATTY ACID; SATURATED FATTY ACID; UNSATURATED FATTY ACID; MONOLAYER; SCANNING TUNNELING MICROSCOPY; STM; DOUBLE BOND; ALKYL CHAIN; CARBOXYL GROUP;
D O I
10.1143/JJAP.34.610
中图分类号
O59 [应用物理学];
学科分类号
摘要
Structures of arachidic acid and elaidic acid molecules adsorbed onto a graphite substrate were investigated using a scanning tunneling microscope. The ordered arrangements of the molecules were observed with atomic resolution. The image of an arachidic acid molecule is composed of nineteen bright spots at the individual hydrocarbon groups in the alkyl chain and a dark region at the carboxyl group. The image of an elaidic acid molec;le with an unsaturated hydrocarbon chain is similar to that of an arachidic acid molecule except for a much brighter spot at, the double bond in the hydrocarbon chain. As a result, functional groups such as hydrocarbon chains, carboxyl groups and double bonds could be distinguished by the tunnel currents.
引用
收藏
页码:610 / 614
页数:5
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