What is it about?
In this work we investigate the electronic transport in single-molecules junctions composed by CNT/oligophenylenes/CNT through of the Transition Voltage Spectroscopy (TVS) by means of the coherent transport model given by the Landauer-Buttiker formula for the case of the conductance (G) that is related to transmittance T(E, Ve , ) of a two-lead system where negative differential conductance voltage VNDC matches with minima voltage V min in the Fowler-Nordheim plot.
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Why is it important?
The results exhibit: (i) one linear region (showing resistive behavior given by Ohm’s Law); (ii) two nonlinear regions (resonance and NDC); (iii) the possibility of a fourth nonlinear region of operation (or second resonance). We find that the conductance (G/G o ) in these systems is strongly correlated to the Frontiers Molecular Orbitals (HOMO and LUMO) and to the chiral index ψ, which depends only on atomic positions and it is found quantitatively by Group Theory calculations.
Perspectives
Molecular junctions offer a viable alternative for applications in nanoscale electronic devices. So, The atomic positions are related the conformation change (twist angle, ) where each phenylene ring can rotate about the single C–C bonds that connects them that influences in the symmetry properties (ψ) and electronic transport (G/G o ) of the CNT/oligophenylene/CNT junctions, giving rise to the cos2 law.
Prof. Dr. Carlos Alberto Brito da Silva Jr.
Universidade Federal do Para
Read the Original
This page is a summary of: Organic Nano-Devices Composed by Carbon NanoTube/Oligophenylenes/Carbon NanoTube Junctions: Transition-Voltage Spectroscopy, Applications and Chirality versus Geometry, Journal of Nanoscience and Nanotechnology, September 2016, American Scientific Publishers,
DOI: 10.1166/jnn.2016.12706.
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