Molecular Electronics: Noncovalent Self-Assembled Monolayers on Graphene as a Highly Stable Platform for Molecular Tunnel Junctions (Adv. Mater. 4/2016)

2016 ◽  
Vol 28 (4) ◽  
pp. 784-784 ◽  
Author(s):  
Peng Song ◽  
C. S. Suchand Sangeeth ◽  
Damien Thompson ◽  
Wei Du ◽  
Kian Ping Loh ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Tunnel Junctions ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

A surprising way to control the charge transport in molecular electronics: the subtle impact of the coverage of self-assembled monolayers of floppy molecules adsorbed on metallic electrodes

2017 ◽  
Vol 204 ◽  
pp. 35-52 ◽  
Author(s):  
Ioan Bâldea
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Molecular Species ◽  
Molecular Conformation ◽  
Theoretical Work ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Twisting Angle

Inspired by earlier attempts in organic electronics aiming at controlling charge injection from metals into organic materials by manipulating the Schottky energy barrier using self-assembled monolayers (SAMs), recent experimental and theoretical work in molecular electronics showed that metal–organic interfaces can be controlled via changes in the metal work function that are induced by SAMs. In this paper we indicate a different route to achieve interface-driven control over the charge transfer/transport at the molecular scale. It is based on the fact that, in floppy molecule based SAMs, the molecular conformation can be tuned by varying the coverage of the adsorbate. We demonstrate this effect with the aid of benchmark molecules that are often used to fabricate nanojunctions and consist of two rings that can easily rotate relative to each other. We show that, by varying the coverage of the SAM, the twisting angle φ of the considered molecular species can be modified by a factor of two. Given the fact that the low bias conductance G scales as cos2 φ, this results in a change in G of over one order of magnitude for the considered molecular species. Tuning the twisting angle by controlling the SAM coverage may be significant, e.g., for current efforts to fabricate molecular switches. Conversely, the lack of control over the local SAM coverage may be problematic for the reproducibility and interpretation of the STM (scanning tunneling microscope) measurements on repeatedly forming single molecule break junctions.

Self assembled monolayers on silicon for molecular electronics

2006 ◽  
Vol 568 (1-2) ◽  
pp. 84-108 ◽  
Author(s):  
D.K. Aswal ◽  
S. Lenfant ◽  
D. Guerin ◽  
J.V. Yakhmi ◽  
D. Vuillaume
Keyword(s):  
Molecular Electronics ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Impact of Metal-Organic Interface on the Growth Mechanism and Magnetic Properties of Permalloy (Fe : Ni) Films Sputtered on Self-Assembled Monolayers of Polar and Nonpolar Molecules

2010 ◽  
Vol 442 ◽  
pp. 158-163
Author(s):  
S.N. Ahmad ◽  
G.F. Strouse ◽  
S.A. Shaheen
Keyword(s):  
Magnetic Properties ◽  
Molecular Electronics ◽  
Self Assembled Monolayers ◽  
Ferromagnetic Behavior ◽  
Polar Regions ◽  
Assembled Monolayers ◽  
Metal Organic ◽  
Self Assembled ◽  
The Impact ◽  
Nonpolar Molecules

Metal deposition on self-assembled monolayers (SAMs) with different terminal organic functional groups is a growing area of research and the metal-organic interface has been extensively studied in the past two decades. Apart from impacting existing technologies, it may have a profound impact on the emerging future technologies such as molecular electronics. The morphology of the deposited metals is strongly influenced by the nature of the chemical interactions occurring at the interface of the organic functional group (OFG) of the SAM and the deposited metal. Our interest for such studies stems from different perspective, as we are interested in determining the impact of the interface on the morphology and hence the magnetic properties of the deposited magnetic materials. We have sputtered a magnetic material, permalloy (Ni79Fe21), on self-assembled monolayers of polar and nonpolar molecules, and have observed contrasting magnetic behaviors of permalloy on these surfaces. We have observed the formation of uniform film on polar regions and cluster are formed on nonpolar regions. Further investigations reveal that the cluster formation gives rise to superparamagnetism, while the uniform film shows a usual ferromagnetic behavior. The observed contrast in morphology and magnetism of Py is attributed to different growth mechanisms arising from difference in polarity of the SAM surfaces.

Quantitative Analysis of Weak Current Rectification in Molecular Tunnel Junctions Subject to Mechanical Deformation Reveals Two Different Rectification Mechanisms for Oligophenylene Thiols versus Alkane Thiols

Nanoscale ◽  
2021 ◽  
Author(s):  
Zuoti Xie ◽  
Ioan Baldea ◽  
Van Quyen Nguyen ◽  
C. Daniel Frisbie
Keyword(s):  
Quantitative Analysis ◽  
Tunnel Junctions ◽  
Mechanical Deformation ◽  
Self Assembled Monolayers ◽  
Weak Current ◽  
Assembled Monolayers ◽  
Alkane Thiol ◽  
Current Rectification ◽  
Self Assembled ◽  
Alkane Thiols

Metal-molecule-metal junctions based on alkane thiol (CnT) and oligophenylene thiol (OPTn) self-assembled monolayers (SAMs) and Au electrodes are expected to exhibit similar electrical asymmetry, as both junctions have one chemisorbed...

Self-assembled monolayers of terminal acetylenes as replacements for thiols in bottom-up tunneling junctions

RSC Advances ◽  
2014 ◽  
Vol 4 (99) ◽  
pp. 56026-56030 ◽  
Author(s):  
Davide Fracasso ◽  
Sumit Kumar ◽  
Petra Rudolf ◽  
Ryan C. Chiechi
Keyword(s):  
Molecular Electronics ◽  
Self Assembled Monolayers ◽  
Bottom Up ◽  
Assembled Monolayers ◽  
Tunneling Junctions ◽  
Self Assembled ◽  
Terminal Acetylenes

Why use thiols in Molecular Electronics?

Molecular junctions made of tungsten-polyoxometalate self-assembled monolayers: Towards polyoxometalate-based molecular electronics devices

2011 ◽  
Vol 88 (8) ◽  
pp. 2775-2777 ◽  
Author(s):  
D. Velessiotis ◽  
A.M. Douvas ◽  
S. Athanasiou ◽  
B. Nilsson ◽  
G. Petersson ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Molecular Junctions ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Noncovalent Self-Assembled Monolayers on Graphene as a Highly Stable Platform for Molecular Tunnel Junctions

2015 ◽  
Vol 28 (4) ◽  
pp. 631-639 ◽  
Author(s):  
Peng Song ◽  
C. S. Suchand Sangeeth ◽  
Damien Thompson ◽  
Wei Du ◽  
Kian Ping Loh ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled
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