Mechanically Induced Switching between Two Discrete Conductance States: A Potential Single-Molecule Variable Resistor

2021 ◽  
Author(s):  
Lin-Qi Pei ◽  
John R. Horsley ◽  
Jing-Wen Seng ◽  
Xu Liu ◽  
Yuan Qi Yeoh ◽  
...  
Keyword(s):  
Single Molecule ◽  
Variable Resistor ◽  
Conductance States

Three-state molecular potentiometer based on a non-symmetrically positioned in-backbone linker

2021 ◽  
Author(s):  
Lucia Palomino-Ruiz ◽  
Pablo Reiné ◽  
Irene R. Marquez ◽  
Luis Alvarez de Cienfuegos ◽  
Nicolas Agrait ◽  
...  
Keyword(s):  
Single Molecule ◽  
Theoretical Models ◽  
Phenylene Ethynylene ◽  
Conductance States

We report on the synthesis and single-molecule conductance of a para-oligo(phenylene)ethynylene (p-OPE) derivative with three well-defined conductance states. Employing theoretical models and comparing to reference compounds we show that this...

A computational study on a multimode spin conductance switching by coordination isomerization in organometallic single-molecule junctions

2018 ◽  
Vol 20 (30) ◽  
pp. 20280-20286 ◽  
Author(s):  
Yingjie Jiang ◽  
Xiaodong Xu ◽  
Yangyang Hu ◽  
Guiling Zhang ◽  
Zhewen Liang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Molecular Design ◽  
Computational Study ◽  
Conductance Switching ◽  
Single Molecule Junctions ◽  
Conductance States ◽  
Spin Conductance

Single-molecule junctions provide the additional flexibility of tuning the on/off conductance states through molecular design.

Selective formation of molecular junctions with high and low conductance states by tuning the velocity of electrode displacement

2020 ◽  
Vol 22 (8) ◽  
pp. 4544-4548
Author(s):  
Yuji Isshiki ◽  
Shintaro Fujii ◽  
Tomoaki Nishino ◽  
Manabu Kiguchi
Keyword(s):  
Single Molecule ◽  
Molecular Junctions ◽  
Break Junction ◽  
Scanning Tunnelling ◽  
Electrode Displacement ◽  
Molecule Junction ◽  
Tunnelling Microscopy ◽  
Single Molecule Junction ◽  
Conductance States ◽  
Selective Formation

A single-molecule junction of 1,4-di(4-pyridyl)benzene (DPB) was prepared in a nano-gap between two Au electrodes using the scanning tunnelling microscopy-based break junction method (STM-BJ).

Voltage-dependent conductance states of a single-molecule junction

2012 ◽  
Vol 24 (39) ◽  
pp. 394012 ◽  
Author(s):  
Y F Wang ◽  
N Néel ◽  
J Kröger ◽  
H Vázquez ◽  
M Brandbyge ◽  
...  
Keyword(s):  
Single Molecule ◽  
Voltage Dependent ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Conductance States

Single-molecule junction of an overcrowded ethylene with binary conductance states

2018 ◽  
Vol 57 (3S2) ◽  
pp. 03EG05 ◽  
Author(s):  
Masato Koike ◽  
Shintaro Fujii ◽  
Haruna Cho ◽  
Yoshiaki Shoji ◽  
Tomoaki Nishino ◽  
...  
Keyword(s):  
Single Molecule ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
Conductance States

Resistance Monitor and Control for Vacuum Evaporation of Metals and Carbon

1976 ◽  
Vol 34 ◽  
pp. 572-573
Author(s):  
Russell L. Steere ◽  
Eric F. Erbe ◽  
J. Michael Moseley
Keyword(s):  
Electronic Device ◽  
Point Sources ◽  
High Contrast ◽  
Variable Resistor ◽  
Quality Of Results ◽  
Low Contrast ◽  
Evaporation Source ◽  
And Control ◽  
At Will

We have designed and built an electronic device which compares the resistance of a defined area of vacuum evaporated material with a variable resistor. When the two resistances are matched, the device automatically disconnects the primary side of the substrate transformer and stops further evaporation.This approach to controlled evaporation in conjunction with the modified guns and evaporation source permits reliably reproducible multiple Pt shadow films from a single Pt wrapped carbon point source. The reproducibility from consecutive C point sources is also reliable. Furthermore, the device we have developed permits us to select a predetermined resistance so that low contrast high-resolution shadows, heavy high contrast shadows, or any grade in between can be selected at will. The reproducibility and quality of results are demonstrated in Figures 1-4 which represent evaporations at various settings of the variable resistor.

The method of replication affects metal film granularity and resolution

1989 ◽  
Vol 47 ◽  
pp. 708-709
Author(s):  
George C. Ruben
Keyword(s):  
Electron Beam ◽  
High Resolution ◽  
Film Thickness ◽  
Single Molecule ◽  
Metal Film ◽  
Vertical Surface ◽  
High Resolution Imaging ◽  
Controllable Factors ◽  
Resolution Imaging

Single molecule resolution in electron beam sensitive, uncoated, noncrystalline materials has been impossible except in thin Pt-C replicas ≤ 150Å) which are resistant to the electron beam destruction. Previously the granularity of metal film replicas limited their resolution to ≥ 20Å. This paper demonstrates that Pt-C film granularity and resolution are a function of the method of replication and other controllable factors. Low angle 20° rotary , 45° unidirectional and vertical 9.7±1 Å Pt-C films deposited on mica under the same conditions were compared in Fig. 1. Vertical replication had a 5A granularity (Fig. 1c), the highest resolution (table), and coated the whole surface. 45° replication had a 9Å granulartiy (Fig. 1b), a slightly poorer resolution (table) and did not coat the whole surface. 20° rotary replication was unsuitable for high resolution imaging with 20-25Å granularity (Fig. 1a) and resolution 2-3 times poorer (table). Resolution is defined here as the greatest distance for which the metal coat on two opposing faces just grow together, that is, two times the apparent film thickness on a single vertical surface.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

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