scholarly journals Mechanically Induced Single-molecule Helicity Switching of Graphene-Nanoribbon-fused Helicene on Au(111)

2021 ◽  
Author(s):  
Ayumu Ishii ◽  
Akitoshi Shiotari ◽  
Yoshiaki Sugimoto
Keyword(s):  
Single Molecule ◽  
Graphene Nanoribbon ◽  
Functional Material ◽  
Advanced Control ◽  
Helical Geometry ◽  
External Stimuli

Helicene is a functional material with chirality caused by its characteristic helical geometry. The inversion of its helicity by external stimuli is a challenging task in the advanced control of...

scholarly journals Cross-Talk Between Ionic and Nanoribbon Current Signals in Graphene Nanoribbon-Nanopore Sensors for Single-Molecule Detection

Small ◽  
2015 ◽  
Vol 11 (47) ◽  
pp. 6309-6316 ◽  
Author(s):  
Matthew Puster ◽  
Adrian Balan ◽  
Julio A. Rodríguez-Manzo ◽  
Gopinath Danda ◽  
Jae-Hyuk Ahn ◽  
...  
Keyword(s):  
Single Molecule ◽  
Cross Talk ◽  
Graphene Nanoribbon ◽  
Single Molecule Detection ◽  
Nanopore Sensors

scholarly journals Addressing single spin crossover molecules in a two-dimensional monolayer

2021 ◽  
Author(s):  
Yongfeng Tong ◽  
Massine Kelaï ◽  
Kaushik Bairagi ◽  
Vincent Repain ◽  
Jérôme Lagoute ◽  
...  
Keyword(s):  
Spin State ◽  
Single Molecule ◽  
Spin Crossover ◽  
Cooperative Behaviour ◽  
Spintronic Devices ◽  
Single Spin ◽  
Elastic Interactions ◽  
Molecular Spin ◽  
External Stimuli ◽  
At Will

Abstract Bistable spin-crossover molecules are particularly interesting to the development of innovative electronic and spintronic devices as they present two spin states that can be controlled by external stimuli. In this purpose, being able to switch at will the spin state of a single molecule in a dense molecular array is a key milestone. However, the elastic interactions between the molecules favour more cooperative behaviour where patches of neighbouring molecules switches simultaneously. We demonstrate here that the interaction of iron II spin-crossover molecules with a metallic substrate can strongly reduce their cooperative behaviour until addressing independently single molecular spin state. Mechanoelastic model is able to reproduce well such findings.

scholarly journals Switching Quantum Interference in Phenoxyquinone Single Molecule Junction with Light

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1544
Author(s):  
Abdalghani Daaoub ◽  
Sara Sangtarash ◽  
Hatef Sadeghi
Keyword(s):  
Molecular Structure ◽  
Single Molecule ◽  
Quantum Interference ◽  
Significant Variation ◽  
Light Stimulus ◽  
New Paradigm ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
External Stimuli

Quantum interference (QI) can lead to large variations in single molecule conductance. However, controlling QI using external stimuli is challenging. The molecular structure of phenoxyquinone can be tuned reversibly using light stimulus. In this paper, we show that this can be utilized to control QI in phenoxyquinone derivatives. Our calculations indicate that, as a result of such variation in molecular structure of phenoxyquinone, a crossover from destructive to constructive QI is induced. This leads to a significant variation in the single molecule conductance by a couple of orders of magnitude. This control of QI using light is a new paradigm in photosensitive single molecule switches and opens new avenues for future QI-based photoswitches.

Self-Oscillating Polymer Gels as Novel Smart Materials

2012 ◽  
Vol 1403 ◽  
Author(s):  
Ryo Yoshida
Keyword(s):  
Smart Materials ◽  
Polymer Gels ◽  
Metal Catalyst ◽  
Polymer Gel ◽  
Functional Material ◽  
Bz Reaction ◽  
Material Systems ◽  
Biomimetic Polymer ◽  
Biomimetic Actuators ◽  
External Stimuli

ABSTRACTAs a novel biomimetic polymer gel, we have been studying polymer gels with an autonomous self-oscillating function, since firstly reported in 1996. For developing the polymer gels, we utilized oscillating chemical reaction, called the Belousov-Zhabotinsky (BZ) reaction, which is recognized as a chemical model for understanding several autonomous phenomena in biological systems. The self-oscillating polymer gel is composed of a poly(N-isopropylacrylamide) network in which the metal catalyst for the BZ reaction is covalently immobilized. Under the coexistence of the reactants, the polymer undergoes spontaneous swelling-deswelling changes (in the case of gel) or cyclic soluble-insoluble changes (in the case of an uncrosslinked polymer) without any on-off switching of external stimuli. Several kinds of functional material systems utilizing self-oscillating polymers and gels such as biomimetic actuators, mass transport surface, etc. are expected. Here recent progress on self-oscillating polymers and gels and the design of functional material systems are summarized.

First principles study of sarin nerve gas adsorption on graphene nanoribbon with single molecule resolution

2020 ◽  
Vol 28 ◽  
pp. 1985-1989
Author(s):  
Harmandar Kaur ◽  
Deep Kamal Kaur Randhawa ◽  
Mamta Khosla ◽  
R.K. Sarin
Keyword(s):  
Single Molecule ◽  
First Principles ◽  
Gas Adsorption ◽  
Graphene Nanoribbon ◽  
First Principles Study ◽  
Nerve Gas

Physical stimulus and chemical modulations of bistable molecular magnetic materials

2020 ◽  
Vol 56 (89) ◽  
pp. 13702-13718
Author(s):  
Min Feng ◽  
Ze-Yu Ruan ◽  
Yan-Cong Chen ◽  
Ming-Liang Tong
Keyword(s):  
Single Molecule ◽  
Recent Progress ◽  
Spin Crossover ◽  
Magnetic Behaviour ◽  
Physical Stimulus ◽  
Chemical Modifications ◽  
Single Molecule Magnets ◽  
Feature Article ◽  
External Stimuli ◽  
Made In

In this Feature Article, we summarize the recent progress made in modulating the multifaceted magnetic behaviour of single-molecule magnets (SMMs) and spin-crossover (SCO) materials based on chemical modifications and external stimuli.

scholarly journals Quantum Interference and Spin Filtering Effects in Photo-responsive Endoperoxide Based Single Molecular Device

2021 ◽  
Author(s):  
Ashima Bajaj ◽  
Rishu Khurana ◽  
Md. Ehesan Ali
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Density Functional ◽  
Reaction Pathway ◽  
Stimuli Responsive ◽  
Spin Configuration ◽  
De Broglie Waves ◽  
Filtering Efficiency ◽  
External Stimuli ◽  
Spin Filtering

<div>The development of stimuli responsive systems that can switch between two distinct spin states under the application of an external stimuli has always remained an illusory challenge. Here, we report a stimuli-based spin filter by utilizing photo-responsive endoperoxide (EPO) based single molecule device. The photo-irradiation on EPO triggers the homolytic cleavage of the peroxide O-O bond generating diradical intermediate centered on two O-atoms which facilitates high spin filtering efficiency when placed between gold electrodes. The broken conjugated scenario due to peroxide bridge of EPO hinders the propagation of de-Broglie waves across the molecular skeleton. While the diradical intermediate of EPO yields high conductance for one of the spin configuration. The transmission characteristics of various photoproducts along the photochemical reaction pathway of EPO are also investigated using density functional theory in combination with non-equilibrium Green’s function (NEGF-DFT) technique. We demonstrate the key role played by Quantum Interference (QI) effects in dramatic modulation of conductance arising due to different degree of conjugation along the reaction pathway of EPO.</div><div><br></div>

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