scholarly journals Richness of molecular junction configurations revealed by tracking a full pull-push cycle

Nanoscale ◽  
2021 ◽  
Author(s):  
Tamar Yelin ◽  
Sudipto Chakrabarti ◽  
Ayelet Vilan ◽  
Oren Tal
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Electronic Transport ◽  
Molecular Orientation ◽  
Molecular Junction ◽  
Single Molecule Level ◽  
Central Interest

In the field of molecular electronics, the interplay between molecular orientation and the resulting electronic transport is of central interest. At the single molecule level, this topic is extensively studied...

scholarly journals Optical probes of molecules as nano-mechanical switches

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Dean Kos ◽  
Giuliana Di Martino ◽  
Alexandra Boehmke ◽  
Bart de Nijs ◽  
Dénes Berta ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Electrical Transport ◽  
Density Functional ◽  
Information Technologies ◽  
Electronic Device ◽  
Density Functional Theory Calculations ◽  
Molecular Junction ◽  
Single Molecule Level ◽  
Ultralow Energy

AbstractMolecular electronics promises a new generation of ultralow-energy information technologies, based around functional molecular junctions. Here, we report optical probing that exploits a gold nanoparticle in a plasmonic nanocavity geometry used as one terminal of a well-defined molecular junction, deposited as a self-assembled molecular monolayer on flat gold. A conductive transparent cantilever electrically contacts individual nanoparticles while maintaining optical access to the molecular junction. Optical readout of molecular structure in the junction reveals ultralow-energy switching of ∼50 zJ, from a nano-electromechanical torsion spring at the single molecule level. Real-time Raman measurements show these electronic device characteristics are directly affected by this molecular torsion, which can be explained using a simple circuit model based on junction capacitances, confirmed by density functional theory calculations. This nanomechanical degree of freedom is normally invisible and ignored in electrical transport measurements but is vital to the design and exploitation of molecules as quantum-coherent electronic nanodevices.

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.

Electrically precise control of the spin polarization of electronic transport at the single-molecule level

2020 ◽  
Vol 22 (30) ◽  
pp. 17229-17235
Author(s):  
Yan-Dong Guo ◽  
Jin-Jie Wang ◽  
Hong-Li Zeng ◽  
Yu-Rong Yang ◽  
Xin-Xin Xu ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Single Molecule ◽  
Electronic Transport ◽  
Single Molecule Level ◽  
Precise Control ◽  
Electrically Modulated

The spin polarization of electronic transmission could be electrically modulated from −100% to 100% at the single-molecule level.

Observing dynamic molecular changes at single-molecule level in a cucurbituril based plasmonic molecular junction

Nanoscale ◽  
2020 ◽  
Vol 12 (32) ◽  
pp. 17103-17112
Author(s):  
Qiushuang Ai ◽  
Jianghao Zhou ◽  
Jing Guo ◽  
Popular Pandey ◽  
Simin Liu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Molecular Junction ◽  
Molecular Changes ◽  
Single Molecule Level ◽  
Single Entity

SERS is combined with the electrochemical single-entity techqniue to probe the dynamic molecular changes in the transiently formed gold–CB[7]–gold junctions.

scholarly journals Redox-addressable single-molecule junctions incorporating a persistent organic radical

2021 ◽  
Author(s):  
Saman Naghibi ◽  
Sara Sangtarash ◽  
Varshini J. Kumar ◽  
Jian-Zhong Wu ◽  
Martyna M. Judd ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Closed Shell ◽  
Open Shell ◽  
Organic Radical ◽  
Molecular Junction ◽  
Ambient Conditions ◽  
Scanning Tunnelling Microscope ◽  
Ambient Temperatures ◽  
Single Molecule Junctions

The integration of radical (open-shell) species into single-molecule junctions at non-cryogenic temperatures is a key to unlocking the potential of molecular electronics in further applications. While many efforts have been devoted to this issue, in the absence of a chemical or electrochemical potential the open-shell character is lost when in contact with the metallic electrodes. Here, the organic 6-oxo-verdazyl radical, which is stable at ambient temperatures and atmosphere, has been functionalised by aurophilic 4-thioanisole groups at the 1,5-positions and fabricated into a molecular junction using the scanning tunnelling microscope break-junction technique. The verdazyl moiety retains open-shell character within the junction even at room temperature, and electrochemical gating permits in-situ reduction of the verdazyl to the closed-shell anionic state in a single-molecule transistor configuration. In addition, the bias-dependent alignment of the open-shell resonances with respect to the electrode Fermi levels gives rise to purely electronically-driven rectifying behaviour. The demonstration of a verdazyl-based molecular junction capable of integrating radical character, transistor-like switching behaviour, and rectification in a single molecular component under ambient conditions paves the way for further studies of the electronic, magnetic, and thermoelectric properties of open-shell species.

scholarly journals Molecular Orientation Determination in Nanodiscs at the Single-Molecule Level

2019 ◽  
Vol 92 (2) ◽  
pp. 2229-2236
Author(s):  
Tyler Camp ◽  
Kritika Mehta ◽  
Stephen G. Sligar ◽  
Kai Zhang
Keyword(s):  
Single Molecule ◽  
Molecular Orientation ◽  
Single Molecule Level ◽  
Orientation Determination

Atomic Force Microscopy (AFM) for Topography and Recognition Imaging at Single Molecule Level

2013 ◽  
pp. 102-112
Author(s):  
Memed Duman ◽  
Andreas Ebner ◽  
Christian Rankl ◽  
Jilin Tang ◽  
Lilia A. Chtcheglova ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Single Molecule ◽  
Single Molecule Level ◽  
Force Microscopy ◽  
Atomic Force ◽  
Recognition Imaging

Curaxin-Induced DNA Topology Alterations Trigger the Distinct Binding Response of CTCF and FACT at the Single-Molecule Level

Biochemistry ◽  
2021 ◽  
Vol 60 (7) ◽  
pp. 494-499
Author(s):  
Ke Lu ◽  
Cuifang Liu ◽  
Yinuo Liu ◽  
Anfeng Luo ◽  
Jun Chen ◽  
...  
Keyword(s):  
Single Molecule ◽  
Dna Topology ◽  
Single Molecule Level
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