scholarly journals Site-Selection in Single-Molecule Junction for Highly Reproducible Molecular Electronics

2016 ◽  
Vol 138 (4) ◽  
pp. 1294-1300 ◽  
Author(s):  
Satoshi Kaneko ◽  
Daigo Murai ◽  
Santiago Marqués-González ◽  
Hisao Nakamura ◽  
Yuki Komoto ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Site Selection ◽  
Molecule Junction ◽  
Single Molecule Junction

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.

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...

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.

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.

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.

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>

Phosphindole fused pyrrolo[3,2-b]pyrroles: a new single-molecule junction for charge transport

2019 ◽  
Vol 48 (19) ◽  
pp. 6347-6352
Author(s):  
Di Wu ◽  
Jueting Zheng ◽  
Chenyong Xu ◽  
Dawei Kang ◽  
Wenjing Hong ◽  
...  
Keyword(s):  
Charge Transport ◽  
Single Molecule ◽  
High Thermostability ◽  
New Family ◽  
Luminescence Efficiency ◽  
Molecule Junction ◽  
Single Molecule Junction

A new family of phosphindole fused ladder-type heteroacenes with a pyrrolo[3,2-b]pyrrole core were synthesized and characterized, which show good luminescence efficiency, high thermostability and tunable conductance.

Measurement and control of detailed electronic properties in a single molecule break junction

2014 ◽  
Vol 174 ◽  
pp. 91-104 ◽  
Author(s):  
Kun Wang ◽  
Joseph Hamill ◽  
Jianfeng Zhou ◽  
Cunlan Guo ◽  
Bingqian Xu
Keyword(s):  
Data Analysis ◽  
Molecular Electronics ◽  
Single Molecule ◽  
Molecular Orbitals ◽  
Break Junction ◽  
Break Junctions ◽  
Single Molecule Level ◽  
Analysis Techniques ◽  
Future Design ◽  
Molecule Junction

The lack of detailed experimental controls has been one of the major obstacles hindering progress in molecular electronics. While large fluctuations have been occurring in the experimental data, specific details, related mechanisms, and data analysis techniques are in high demand to promote our physical understanding at the single-molecule level. A series of modulations we recently developed, based on traditional scanning probe microscopy break junctions (SPMBJs), have helped to discover significant properties in detail which are hidden in the contact interfaces of a single-molecule break junction (SMBJ). For example, in the past we have shown that the correlated force and conductance changes under the saw tooth modulation and stretch–hold mode of PZT movement revealed inherent differences in the contact geometries of a molecular junction. In this paper, using a bias-modulated SPMBJ and utilizing emerging data analysis techniques, we report on the measurement of the altered alignment of the HOMO of benzene molecules with changing the anchoring group which coupled the molecule to metal electrodes. Further calculations based on Landauer fitting and transition voltage spectroscopy (TVS) demonstrated the effects of modulated bias on the location of the frontier molecular orbitals. Understanding the alignment of the molecular orbitals with the Fermi level of the electrodes is essential for understanding the behaviour of SMBJs and for the future design of more complex devices. With these modulations and analysis techniques, fruitful information has been found about the nature of the metal–molecule junction, providing us insightful clues towards the next step for in-depth study.

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