NDLI: Conductance in a bis-terpyridine based single molecular breadboard circuit

Content Provider	Royal Society of Chemistry (RSC)
Author	Broekmann, Peter Royal, Guy Hong, Wenjing Suravarapu, Sankarrao Lafolet, Frédéric Reber, David Kaliginedi, Veerabhadrarao Wandlowski, Thomas Venkatramani, Ravindra Seth, Charu
Copyright Year	2017
Abstract	Controlling charge flow in single molecule circuits with multiple electrical contacts and conductance pathways is a much sought after goal in molecular electronics. In this joint experimental and theoretical study, we advance the possibility of creating single molecule breadboard circuits through an analysis of the conductance of a bis-terpyridine based molecule (TP1). The TP1 molecule can adopt multiple conformations through relative rotations of 7 aromatic rings and can attach to electrodes in 61 possible single and multi-terminal configurations through 6 pyridyl groups. Despite this complexity, we show that it is possible to extract well defined conductance features for the TP1 breadboard and assign them rigorously to the underlying constituent circuits. Mechanically controllable break-junction (MCBJ) experiments on the TP1 molecular breadboard show an unprecedented 4 conductance states spanning a range 10 −2G0 to 10 −7G0. Quantitative theoretical examination of the conductance of TP1 reveals that combinations of 5 types of single terminal 2–5 ring subcircuits are accessed as a function of electrode separation to produce the distinct conductance steps observed in the MCBJ experiments. We estimate the absolute conductance for each single terminal subcircuit and its percentage contribution to the 4 experimentally observed conductance states. We also provide a detailed analysis of the role of quantum interference and thermal fluctuations in modulating conductance within the subcircuits of the TP1 molecular breadboard. Finally, we discuss the possible development of molecular circuit theory and experimental advances necessary for mapping conductance through complex single molecular breadboard circuits in terms of their constituent subcircuits.
Starting Page	1576
Ending Page	1591
Page Count	16
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	8
Issue Number	2
Journal	Chemical Science
DOI	10.1039/c6sc03204d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Thermal fluctuations Molecular electronics Network analysis (electrical circuits) Electrode Quantum mechanics Breadboard
Content Type	Text
Resource Type	Article
Subject	Chemistry

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