scholarly journals Single-molecule junction spontaneously restored by DNA zipper

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Takanori Harashima ◽  
Shintaro Fujii ◽  
Yuki Jono ◽  
Tsuyoshi Terakawa ◽  
Noriyuki Kurita ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Structural Changes ◽  
Electrical Measurements ◽  
Static Structure ◽  
Electrical Failure ◽  
Molecular Length ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction

AbstractThe electrical properties of DNA have been extensively investigated within the field of molecular electronics. Previous studies on this topic primarily focused on the transport phenomena in the static structure at thermodynamic equilibria. Consequently, the properties of higher-order structures of DNA and their structural changes associated with the design of single-molecule electronic devices have not been fully studied so far. This stems from the limitation that only extremely short DNA is available for electrical measurements, since the single-molecule conductance decreases sharply with the increase in the molecular length. Here, we report a DNA zipper configuration to form a single-molecule junction. The duplex is accommodated in a nanogap between metal electrodes in a configuration where the duplex is perpendicular to the nanogap axis. Electrical measurements reveal that the single-molecule junction of the 90-mer DNA zipper exhibits high conductance due to the delocalized π system. Moreover, we find an attractive self-restoring capability that the single-molecule junction can be repeatedly formed without full structural breakdown even after electrical failure. The DNA zipping strategy presented here provides a basis for novel designs of single-molecule junctions.

Single-molecule junctions for molecular electronics

2016 ◽  
Vol 4 (38) ◽  
pp. 8842-8858 ◽  
Author(s):  
Yuki Komoto ◽  
Shintaro Fujii ◽  
Madoka Iwane ◽  
Manabu Kiguchi
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Unique Structure ◽  
Nano Material ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Low Dimensional

A single-molecule junction shows novel functionalities caused by its unique structure of a low-dimensional nano-material with two metal–molecule interfaces.

Mechanically-Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions

2020 ◽  
Author(s):  
María Camarasa-Gómez ◽  
Daniel Hernangómez-Pérez ◽  
Michael S. Inkpen ◽  
Giacomo Lovat ◽  
E-Dean Fung ◽  
...  
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Degrees Of Freedom ◽  
Building Blocks ◽  
Ferrocene Derivative ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Impact ◽  
D Orbitals

Ferrocenes are ubiquitous organometallic building blocks that comprise a Fe atom sandwiched between two cyclopentadienyl (Cp) rings that rotate freely at room temperature. Of widespread interest in fundamental studies and real-world applications, they have also attracted<br>some interest as functional elements of molecular-scale devices. Here we investigate the impact of<br>the configurational degrees of freedom of a ferrocene derivative on its single-molecule junction<br>conductance. Measurements indicate that the conductance of the ferrocene derivative, which is<br>suppressed by two orders of magnitude as compared to a fully conjugated analog, can be modulated<br>by altering the junction configuration. Ab initio transport calculations show that the low conductance is a consequence of destructive quantum interference effects that arise from the hybridization of metal-based d-orbitals and the ligand-based π-system. By rotating the Cp rings, the hybridization, and thus the quantum interference, can be mechanically controlled, resulting in a conductance modulation that is seen experimentally.<br>

scholarly journals Nearfield trapping increases lifetime of single-molecule junction by one order of magnitude

2020 ◽  
Author(s):  
Albert C. Aragonès ◽  
Katrin F. Domke
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Fold Increase ◽  
Trapping Efficiency ◽  
Non Invasive ◽  
Order Of Magnitude ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Difference ◽  
Power Densities

Abstract Progress in molecular electronics (ME) is largely based on improved understanding of the properties of single molecules (SM) trapped for seconds or longer to enable their detailed characterization. We present a plasmon-supported break-junction (PBJ) platform to significantly increase the lifetime of SM junctions of 1,4-benzendithiol (BDT) without the need for chemical modification of molecule or electrode. Moderate far-field power densities of ca. 11 mW/µm2 lead to a >10-fold increase in minimum lifetime compared to laser-OFF conditions. The nearfield trapping efficiency is twice as large for bridge-site contact compared to hollow-site geometry, which can be attributed to the difference in polarizability. Current measurements and tip-enhanced Raman spectra confirm that native structure and contact geometry of BDT are preserved during the PBJ experiment. By providing a non-invasive pathway to increase short lifetimes of SM junctions, PBJ is a valuable approach for ME, paving the way for improved SM sensing and recognition platforms.

Kinetic investigation of a chemical process in single-molecule junction

2020 ◽  
Vol 56 (2) ◽  
pp. 309-312 ◽  
Author(s):  
Yusuke Hasegawa ◽  
Takanori Harashima ◽  
Yuki Jono ◽  
Takumi Seki ◽  
Manabu Kiguchi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Chemical Process ◽  
Kinetic Investigation ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction

Herein, we report on the kinetic investigation for the breakdown of single-molecule junctions.

scholarly journals Gating of single molecule junction conductance by charge transfer complex formation

Nanoscale ◽  
2015 ◽  
Vol 7 (45) ◽  
pp. 18949-18955 ◽  
Author(s):  
Andrea Vezzoli ◽  
Iain Grace ◽  
Carly Brooke ◽  
Kun Wang ◽  
Colin J. Lambert ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Single Molecule ◽  
Charge Transfer Complex ◽  
Single Molecule Junctions ◽  
Aromatic Donor ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Junction Conductance

Tetracyanoethene complexation boosts the conductance of metal |molecule| metal single molecule junctions involving suitable aromatic donor moieties by about 20-fold.

Single-molecule junctions of π molecules

2018 ◽  
Vol 2 (2) ◽  
pp. 214-218 ◽  
Author(s):  
Y. Komoto ◽  
S. Fujii ◽  
M. Kiguchi
Keyword(s):  
Intermolecular Interaction ◽  
Single Molecule ◽  
Intrinsic Properties ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction

An investigation on a single-molecule junction reveals the intrinsic properties of a π molecule without the effect of intermolecular interaction and also uncovers its unique properties.

scholarly journals Long-lived charged states of single porphyrin-tape junctions under ambient conditions

2021 ◽  
Vol 6 (1) ◽  
pp. 49-58
Author(s):  
Edmund Leary ◽  
Georg Kastlunger ◽  
Bart Limburg ◽  
Laura Rincón-García ◽  
Juan Hurtado-Gallego ◽  
...  
Keyword(s):  
Charge State ◽  
Molecular Electronics ◽  
Single Molecule ◽  
Room Temperature ◽  
Ambient Conditions ◽  
Molecular Memory ◽  
Molecule Junction ◽  
Single Molecule Junction

Controlling the charge state of a molecule wired in a two-terminal single-molecule junction at room temperature is a key challenge in molecular electronics in relation to the development of molecular memory and other computational componentry.

scholarly journals Mechanical Conductance Tunability of a Porphyrin-Cyclophane Single-Molecule Junction

Nanoscale ◽  
2021 ◽  
Author(s):  
Werner M. Schosser ◽  
Chun-Wei Hsu ◽  
Patrick Zwick ◽  
Katawoura Beltako ◽  
Diana Dulic ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Quantum Interference ◽  
Ambient Conditions ◽  
Molecule Junction ◽  
Single Molecule Junction

The possibility to study quantum interference phenomena at ambient conditions is an appealing feature of molecular electronics. By connecting two porphyrins in a cofacial cyclophane, we create an attractive platform...

scholarly journals Mechanically-Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions

2020 ◽  
Author(s):  
María Camarasa-Gómez ◽  
Daniel Hernangómez-Pérez ◽  
Michael S. Inkpen ◽  
Giacomo Lovat ◽  
E-Dean Fung ◽  
...  
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Degrees Of Freedom ◽  
Building Blocks ◽  
Ferrocene Derivative ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Impact ◽  
D Orbitals

Ferrocenes are ubiquitous organometallic building blocks that comprise a Fe atom sandwiched between two cyclopentadienyl (Cp) rings that rotate freely at room temperature. Of widespread interest in fundamental studies and real-world applications, they have also attracted<br>some interest as functional elements of molecular-scale devices. Here we investigate the impact of<br>the configurational degrees of freedom of a ferrocene derivative on its single-molecule junction<br>conductance. Measurements indicate that the conductance of the ferrocene derivative, which is<br>suppressed by two orders of magnitude as compared to a fully conjugated analog, can be modulated<br>by altering the junction configuration. Ab initio transport calculations show that the low conductance is a consequence of destructive quantum interference effects that arise from the hybridization of metal-based d-orbitals and the ligand-based π-system. By rotating the Cp rings, the hybridization, and thus the quantum interference, can be mechanically controlled, resulting in a conductance modulation that is seen experimentally.<br>

Functional oligothiophenes toward molecular wires in single-molecular electronics

2012 ◽  
Vol 84 (4) ◽  
pp. 931-943 ◽  
Author(s):  
Yutaka Ie ◽  
Masaru Endou ◽  
Aihong Han ◽  
Ryo Yamada ◽  
Hirokazu Tada ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Molecular Electronics ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Molecular Wires ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Cv Measurements

The synthesis of 3-hexylthiophene-based oligothiophenes with a length of approximately 10 nm bearing anchor units at both terminal positions has been accomplished. In addition, we have designed and synthesized completely encapsulated oligothiophenes to investigate single-molecule conductance. Their properties are evaluated by UV–vis absorption spectra and cyclic voltammetry (CV) measurements. The conductance of a single-molecule junction for thiol-introduced oligothiophenes was measured by 10-nm-scale nanogap gold electrodes or modified scanning tunneling microscope (STM) techniques.

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