Electrochemical Fabrication of Surface Chemical Gradients in Thiol Self-Assembled Monolayers with Tailored Work-Functions

Langmuir ◽  
2014 ◽  
Vol 30 (39) ◽  
pp. 11591-11598 ◽  
Author(s):  
Giulia Fioravanti ◽  
Francesca Lugli ◽  
Denis Gentili ◽  
Vittoria Mucciante ◽  
Francesca Leonardi ◽  
...  
Keyword(s):  
Self Assembled Monolayers ◽  
Surface Chemical ◽  
Chemical Gradients ◽  
Assembled Monolayers ◽  
Work Functions ◽  
Self Assembled ◽  
Electrochemical Fabrication

scholarly journals Tuning of Metal Work Functions with Self-Assembled Monolayers

2005 ◽  
Vol 17 (5) ◽  
pp. 621-625 ◽  
Author(s):  
B. de Boer ◽  
A. Hadipour ◽  
M. M. Mandoc ◽  
T. van Woudenbergh ◽  
P. W. M. Blom
Keyword(s):  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Work Functions ◽  
Self Assembled ◽  
Metal Work

scholarly journals Tuning of metal work functions with self-assembled monolayers

2004 ◽  
Author(s):  
Bert de Boer ◽  
Afshin Hadipour ◽  
Remko Foekema ◽  
Teunis van Woudenbergh ◽  
Magda M. Mandoc ◽  
...  
Keyword(s):  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Work Functions ◽  
Self Assembled ◽  
Metal Work

scholarly journals Tuning of Metal Work Functions with Self-Assembled Monolayers

2005 ◽  
Vol 871 ◽  
Author(s):  
B. de Boer ◽  
A. Hadipour ◽  
M. M. Mandoc ◽  
P. W. M. Blom
Keyword(s):  
Modified Electrodes ◽  
Photovoltaic Cell ◽  
Silver Electrode ◽  
Hole Injection ◽  
Self Assembled Monolayers ◽  
Polymer Leds ◽  
Assembled Monolayers ◽  
Work Functions ◽  
Self Assembled ◽  
Metal Work

AbstractWe demonstrate the tuning of metal work functions by chemically modifying the metal surface through the formation of chemisorbed self-assembled monolayers (SAMs) derived from 1H,1H,2H,2H-perfluorinated alkanethiols and hexadecanethiol. The ordering inherent in the SAMs creates an effective, molecular dipole at the metal/SAM interface, which increased the work function of Ag (φAg∼4.4 eV) to 5.5 eV (Δφ∼1.1 eV) for 1H,1H,2H,2H-perfluorinated alkanethiols. Hexadecanethiol on the other hand shifted φAg to 3.8 eV (Δφ ∼0.6 eV). On Au, the SAM of 1H,1H,2H,2H-perfluorodecanethiol raised φAu (4.9 eV) with 0.6 eV to 5.5 eV, whereas hexadecanethiol decreased φAu by 0.8 eV. These chemically modified electrodes were applied in the fabrication of polymer LEDs and the hole injection into poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene (MEH-PPV) was investigated. An Ohmic contact for hole injection between a silver electrode functionalized with the perfluorinated SAMs, and MEH-PPV with a HOMO of 5.3 eV was established. Conversely, a silver electrode modified with a SAM of hexadecanethiol lowered φAg to 3.8 eV blocked the hole injection into PPV, which enables studying the electron transport in composite devices. The electron-only current was measured in a polymer/polymer blend photovoltaic cell based on MDMO-PPV (as donor) and poly[oxa-1,4-phenylene-(1-cyano-1,2-vinylene)-(2-methoxy-5-(3′,7′-dimethyloctyloxy)-phenylene)-1,2-(2-cyanovinylene)-1,4-phenylene] (PCNEPV, acceptor). This method demonstrates a simple and attractive approach to modify and improve metal/organic contacts in organic electronic devices like LEDs, photovoltaic cells, and FETs.

Fabricating Chemical Gradients on Oxide Surfaces by Means of Fluorinated, Catechol-Based, Self-Assembled Monolayers†

Langmuir ◽  
2010 ◽  
Vol 26 (21) ◽  
pp. 16211-16220 ◽  
Author(s):  
Mathias Rodenstein ◽  
Stefan Zürcher ◽  
Samuele G. P. Tosatti ◽  
Nicholas D. Spencer
Keyword(s):  
Self Assembled Monolayers ◽  
Oxide Surfaces ◽  
Chemical Gradients ◽  
Assembled Monolayers ◽  
Self Assembled

Imaging Electrochemical Controlled Chemical Gradients Using Pulsed Force Mode Atomic Force Microscopy

2000 ◽  
Vol 6 (S2) ◽  
pp. 726-727
Author(s):  
G. Fried ◽  
K Balss ◽  
P. W. Bohn
Keyword(s):  
Oscillation Amplitude ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Chemical Gradients ◽  
Atomic Force ◽  
Assembled Monolayers ◽  
Force Mode ◽  
Tapping Mode Afm ◽  
Self Assembled

The electrochemical formation of gradients in self assembled monolayers has been demonstrated recently [1]. The capacity to image these gradients provides useful information on the physical chemistry of electrochemical striping.Imaging chemical gradients requires the ability to sense the chemical moiety on the top of the self-assembled monolayer. This has been accomplished by derivatizing an atomic force microscope (AFM) tip with molecules selected to have specific interactions with the sample in a technique known as chemical force microscopy [2]. Typical tapping mode AFM is then used to image the sample; the tip is oscillated vertically above the sample and the tip-sample interaction modulates the amplitude of the tip.The sample adhesion, sample stiffness, and sample topography all influence the oscillation amplitude of the tip. Pulsed Force Mode (PFM) [3] is an extension for atomic force microscopes. The PFM electronics introduces a sinusoidal modulation to the z-piezo of the AFM with an amplitude between 10 to 500 nm at a user selectable frequency between 100 Hz and 2 kHz.

scholarly journals Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid

2012 ◽  
Vol 7 (4) ◽  
pp. 218-224 ◽  
Author(s):  
Koji Miyake ◽  
Takamasa Kume ◽  
Miki Nakano ◽  
Atsushi Korenaga ◽  
Koji Takiwatari ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Chemical Properties ◽  
Self Assembled Monolayers ◽  
Surface Chemical ◽  
Frictional Properties ◽  
Assembled Monolayers ◽  
Self Assembled
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