Scanning tunneling microscopy using chemically modified tips

被引：55

作者：

Ito, T ^{[1
]}

Bühlmann, P ^{[1
]}

Umezawa, Y ^{[1
]}

机构：

[1] Univ Tokyo, Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 113, Japan

来源：

ANALYTICAL CHEMISTRY | 1998年 / 70卷 / 02期

关键词：

D O I：

10.1021/ac970498w

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Monolayers of 1-octadecanol, 1-chlorooctadecane, and 1-octadecanoic acid were observed with scanning tunneling microscopy(STM). Chemical modification of STM tips allowed recognition of functional groups in monolayers of 1-octadecanol and 1-octadecanoic acid. Enhanced contrasts for hydroxyl and carboxyl residues were observed with gold tips modified with several aromatic mercaptans that can form hydrogen bonds (4-mercapto-pyridine, 4-aminothiophenol, 4-hydroxythiophenol). On the other hand, no such enhancements were observed in monolayers of 1-chlorooctadecane. The enhanced contrasts for the OH and COOH groups seem to be due to electron tunneling through hydrogen bonds formed between the functional groups on tip and sample. These results suggest that tailored modification of STM tips may become a general method for the recognition of specific chemical species and functional groups in STM images.

引用

页码：255 / 259

页数：5

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