Measurements of currents through single molecules of alkanedithiols by repeated formation of break junction in scanning tunneling microscopy under ultrahigh vacuum

被引：33

作者：

Suzuki, M ^{[1
]}

Fujii, S ^{[1
]}

Fujihira, M ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Biomol Engn, Midori Ku, Yokohama, Kanagawa 2268501, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2006年 / 45卷 / 3B期

关键词：

single-molecular conductivity; break junction; UHV-STM; alkanedithiol; Au(111);

D O I：

10.1143/JJAP.45.2041

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We measured Currents through the single Molecules of 1,6-hexanedithiol and 1,8-octanedithiol using a scanning tunneling microscope (STM) under ultrahigh vacuum (UHV). Self-assembled monolayers (SAMs) of alkanedithiols were formed on Au(111) surfaces of gold films deposited on mica by dipping them in each 1 mM ethanol solution of alkanedithiols for 1 min. The sample with each SAM was introduced into the UHV-STM chamber. The Current was recorded as a bare An STM tip was repeatedly pushed against and drawn away from the sample surface. In this way, the single molecules of each alkanedithiol Compound bridged a gap between the Au(111) surface and the An STM tip apex by forming S-Au bonds at both ends of the molecules. The single-molecular conductivities G(m6) and G(m8) of alkanedithiols (N = 6, 8) in this break junction were found to be approximately 9.4 x 10(-5) G(0) and 1.3 x 10(-5) G(0) (G(0): quantum conductance), respectively.

引用

页码：2041 / 2044

页数：4

共 41 条

[1] CONDUCTANCE STEPS AND QUANTIZATION IN ATOMIC-SIZE CONTACTS [J].