Field-Emission Resonances at Tip/α,ω-Mercaptoalkyl Ferrocene/Au Interfaces Studied by STM

被引：30

作者：

Mueller-Meskamp, Lars ^{[1
,2
]}

Karthaeuser, Silvia ^{[1
,2
]}

Zandvliet, Harold J. W. ^{[3
]}

Homberger, Melanie ^{[4
,5
]}

Simon, Ulrich ^{[4
,5
]}

Waser, Rainer ^{[1
,2
]}

机构：

[1] Res Ctr Juelich GmbH, Inst Solid State Res IFF, D-52425 Julich, Germany

[2] Res Ctr Juelich GmbH, JARA FIT, D-52425 Julich, Germany

[3] Univ Twente, Mesa Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[4] Rhein Westfal TH Aachen, Inst Inorgan Chem IAC, D-52074 Aachen, Germany

[5] Rhein Westfal TH Aachen, JARA FIT, D-52074 Aachen, Germany

来源：

SMALL | 2009年 / 5卷 / 04期

关键词：

charge transfer; ferrocene; field-emission resonance; scanning tunneling microscopy; self-assembled monolayers; SELF-ASSEMBLED MONOLAYERS; NEGATIVE DIFFERENTIAL RESISTANCE; ALKYL THIOLS; GOLD; ALKANETHIOLS; MECHANISM; JUNCTIONS; AU(111); MICROSCOPY; TRANSPORT;

D O I：

10.1002/smll.200800802

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electrical properties of alpha,omega-mercaptoalkyl ferrocenes with different alkyl chain lengths embedded in a self-assembled host matrix of alkanethiols on Au(111) are studied by scanning tunneling microscopy and spectroscopy. Based on current-distance spectroscopy, as well as on the evaluation of Fowler-Nordheim tunneling current oscillations, the apparent barrier height of ferrocene is determined independently by two methods. The electronic coupling of the ferrocene moiety to the Au(111) substrate is shown to depend on the length of the alkane-spacer chain. In a double tunnel junction model our experimental findings are explained, addressing the role of the different molecular moieties of the mercaptoalkyl ferrocenes.

引用

页码：496 / 502

页数：7

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