Self-assembled monolayer of ssDNA on Au(111) substrate

被引：28

作者：

Wang, HD ^{[1
]}

Tang, ZY ^{[1
]}

Li, Z ^{[1
]}

Wang, EK ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Electroanalyt Chem Lab, Changchun 130022, Jilin, Peoples R China

来源：

SURFACE SCIENCE | 2001年 / 480卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

biological molecules-nucleic acids; self-assembly; scanning tunneling microscopy; gold;

D O I：

10.1016/S0039-6028(01)01007-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Self-assembled monolayer of natural single-stranded DNA (ssDNA) from dl:natured plasmid DNA and pBR322/PstI marker was first observed on Au(111) by low-current STM (Lc-STM). The width of ssDNA stripe measured is 0.9 +/- 0.1 nm, which is just half of the theoretical width of double-stranded DNA (dsDNA). Each ssDNA stripe consists of bright and dark parts. alternatively; the period of two adjacent bright parts in the same ssDNA stripe measured is 0.4 +/- 0.1 nm, which is consistent with the theoretical distance between two adjacent base pairs in ssDNA. The stripe orientations in ssDNA domains are predominately at angles of 0 degrees, 60 degrees or 120 degrees relative to crystallographically faceted steps on the gold surface. The electrochemical experiment indicated that it was ssDNA but not dsDNA that was absorbed on Au(111)surface. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：L389 / L394

页数：6

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