The effect of permanent dipole moments of adsorbates upon I–V characteristics of a bilayer tunneling junction between self-assembled monolayers on an Au(1 1 1) substrate and a gold tip

Autor:	Masamichi Fujihira, T. Senda, Akihiko Nakasa, Uichi Akiba, Satoshi Wakamatsu
Rok vydání:	2003
Předmět:	Chemistry Bilayer Analytical chemistry Self-assembled monolayer Substrate (electronics) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Dipole Crystallography Electrode Monolayer Work function Instrumentation Quantum tunnelling
Zdroj:	Ultramicroscopy. 97:27-33
ISSN:	0304-3991
DOI:	10.1016/s0304-3991(03)00027-5
Popis:	It is important to understand an electronic property of an interface between an organic material and a metal electrode. In the present work, we measured current–voltage ( I – V ) curves of self-assembled monolayers (SAMs) on Au(1 1 1) using a conducting atomic force microscope (AFM) with chemically modified Au-coated AFM tips. This contact resulted in a bilayer junction between the Au(1 1 1) substrate covered with one SAM and the Au-coated tip with the other SAM. An alkanethiol (octanethiol) and benzenemethanethiols with various terminal groups (–H, –CH 3 , –Cl, –CF 3 ) were used as the adsorbates. The shapes of the I – V curves depended on the terminal groups. This phenomenon was attributed to the change in the work function of gold due to different permanent dipole moments of the terminal groups.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7753904d697071252a383d1a0fc18f4a https://doi.org/10.1016/s0304-3991(03)00027-5 Zobrazit plný text záznamu Full Text from ScienceDirect