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.

scholarly journals Effect of the environment on the electrical conductance of the single benzene-1,4-diamine molecule junction

2011 ◽  
Vol 2 ◽  
pp. 755-759 ◽  
Author(s):  
Shigeto Nakashima ◽  
Yuuta Takahashi ◽  
Manabu Kiguchi
Keyword(s):  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Molecular Motion ◽  
Electrical Conductance ◽  
Scanning Tunneling ◽  
Metal Electrodes ◽  
Tunneling Microscope ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Solvent Molecules

We investigated the effect of the environment on the electrical conductance of a single benzene-1,4-diamine (BDA) molecule bridging Au electrodes, using the scanning tunneling microscope (STM). The conductance of the single BDA molecule junction decreased upon a change in the environment from tetraglyme, to mesitylene, to water, and finally to N2 gas, while the spread in the conductance value increased. The order of the conductance values of the single BDA molecule junction was explained by the strength of the interaction between the solvent molecules and the Au electrodes. The order of the spread in the conductance values was explained by the diversity in the coverage of the BDA molecule at metal electrodes and atomic and molecular motion of the single-molecule junction.

scholarly journals Many-Body State Description of Single-Molecule Electroluminescence Driven by a Scanning Tunneling Microscope

Nano Letters ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 2803-2811 ◽  
Author(s):  
Kuniyuki Miwa ◽  
Hiroshi Imada ◽  
Miyabi Imai-Imada ◽  
Kensuke Kimura ◽  
Michael Galperin ◽  
...  
Keyword(s):  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Many Body ◽  
Tunneling Microscope ◽  
Body State

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.

Electric Field-induced switching among multiple conductance pathways in single-molecule junctions

2021 ◽  
Author(s):  
Tengyang Gao ◽  
Zhichao Pan ◽  
Zhuanyun Cai ◽  
Jueting Zheng ◽  
Chun Tang ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Binding Sites ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Field Increase ◽  
Electric Field Increase ◽  
Single Molecule Junctions

Here, we report the switching among multiple conductance pathways achieved by sliding the scanning tunneling microscope tip among different binding sites under different electric fields. With the electric field increase,...

DETECTING AND MANIPULATING SINGLE MOLECULES WITH STM

NANO ◽  
2006 ◽  
Vol 01 (01) ◽  
pp. 15-33 ◽  
Author(s):  
J. G. HOU ◽  
AIDI ZHAO
Keyword(s):  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Light Emission ◽  
Single Molecules ◽  
Final Part ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Recent Advances ◽  
Recent Developments ◽  
Single Molecule Manipulation

Scanning tunneling microscope (STM) is a powerful and unique tool for study single molecules. We review recent advances in single-molecule characterizations including direct STM imaging and I–V spectroscopy, dI/dV spectroscopy and mapping, and d2I/dV2 spectroscopy and mapping. Some recent experiments of STM-excited single-molecule light emission are also introduced. In the final part, recent developments of single-molecule manipulation with the STM as well as the applications are discussed.

Regulating the femtosecond excited-state lifetime of a single molecule

Science ◽  
2018 ◽  
Vol 361 (6406) ◽  
pp. 1012-1016 ◽  
Author(s):  
K. R. Rusimova ◽  
R. M. Purkiss ◽  
R. Howes ◽  
F. Lee ◽  
S. Crampin ◽  
...  
Keyword(s):  
Excited State ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Initial Condition ◽  
Excited State Lifetime ◽  
Invariant Surface ◽  
Ionic State ◽  
Tunneling Microscope ◽  
Excited State Dynamics

The key to controlling reactions of molecules induced with the current of a scanning tunneling microscope (STM) tip is the ultrashort intermediate excited ionic state. The initial condition of the excited state is set by the energy and position of the injected current; thereafter, its dynamics determines the reaction outcome. We show that a STM can directly and controllably influence the excited-state dynamics. For the STM-induced desorption of toluene molecules from the Si(111)-7x7 surface, as the tip approaches the molecule, the probability of manipulation drops by two orders of magnitude. A two-channel quenching of the excited state is proposed, consisting of an invariant surface channel and a tip height–dependent channel. We conclude that picometer tip proximity regulates the lifetime of the excited state from 10 femtoseconds to less than 0.1 femtoseconds.

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