Title :

Influence of Molecular Organization on the Electrical Characteristics of π‑Conjugated Self-Assembled Monolayers

Author(s) :

Lefèvre, Xavier [Auteur]
Laboratoire Innovation en Chimie des Surfaces et NanoSciences [LICSEN UMR 3685]
Moggia, Fabrice [Auteur]
Laboratoire Innovation en Chimie des Surfaces et NanoSciences [LICSEN UMR 3685]
Segut, Olivier [Auteur]
Laboratoire Innovation en Chimie des Surfaces et NanoSciences [LICSEN UMR 3685]
Lin, Yu-Pu [Auteur]
Institut des Matériaux, de Microélectronique et des Nanosciences de Provence [IM2NP]
Ksari, Younal [Auteur]
Institut des Matériaux, de Microélectronique et des Nanosciences de Provence [IM2NP]
Delafosse, Grégory [Auteur]
Institut des Matériaux, de Microélectronique et des Nanosciences de Provence [IM2NP]
Institut Supérieur d'Electronique et du Numérique [ISEN-TOULON]
Smaali, Kacem [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Guérin, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Derycke, Vincent [Auteur]
Laboratoire Innovation en Chimie des Surfaces et NanoSciences [LICSEN UMR 3685]
Vuillaume, Dominique [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Lenfant, Stephane [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Patrone, Lionel [Auteur]
Institut Supérieur d'Electronique et du Numérique [ISEN-TOULON]
Institut des Matériaux, de Microélectronique et des Nanosciences de Provence [IM2NP]
Jousselme, Bruno [Auteur]
Laboratoire Innovation en Chimie des Surfaces et NanoSciences [LICSEN UMR 3685]

Journal title :

Journal of Physical Chemistry C

Pages :

5703-5713

Publisher :

American Chemical Society

Publication date :

2015-02-24

ISSN :

1932-7447

HAL domain(s) :

Chimie/Matériaux

English abstract : [en]

Two new thiol compounds with σ−π−σ structure were synthesized and self-assembled on gold substrates. The morphology and the structural characterization of SAMs assessed by infrared spectroscopy, contact angle, XPS, ...
Show more >Two new thiol compounds with σ−π−σ structure were synthesized and self-assembled on gold substrates. The morphology and the structural characterization of SAMs assessed by infrared spectroscopy, contact angle, XPS, electrochemistry and scanning tunneling microscopy (STM) show the formation of monolayers. SAMs with a terthiophene (3TSH) core as conjugated system are much better organized compared to those with a naphthalene carbodiimide (NaphSH) core as demonstrated by the cyclic voltammetry and STM studies. The surface concentration of 3TSH and NaphSH is, respectively, three and six times lower than ordered SAMs of pure alkyl chains. A large number of I/V characteristics have been studied either by STS measurements on gold substrates or by C-AFM on gold nanodots. Transition voltage spectroscopy (TVS) was used to clearly identify the transport in these partially organized monolayers. The chemical nature of the conjugated system, donor for 3TSH and acceptor for NaphSH, involves an opposite rectification associated with the asymmetrical coupling of the molecular orbitals and the electrodes. The conductance histograms show that the 3TSH junctions are less dispersed than those of NaphSH junctions. This is explained by a better control of the molecular organization in the molecular junctions.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL