3 research outputs found
Highly Conductive Single-Molecule Wires with Controlled Orientation by Coordination of Metalloporphyrins
Porphyrin-based
molecular wires are promising candidates for nanoelectronic
and photovoltaic devices due to the porphyrin chemical stability and
unique optoelectronic properties. An important aim toward exploiting
single porphyrin molecules in nanoscale devices is to possess the
ability to control the electrical pathways across them. Herein, we
demonstrate a method to build single-molecule wires with metalloporphyrins
via their central metal ion by chemically modifying both an STM tip
and surface electrodes with pyridin-4-yl-methanethiol, a molecule
that has strong affinity for coordination with the metal ion of the
porphyrin. The new flat configuration resulted in single-molecule
junctions of exceedingly high lifetime and of conductance 3 orders
of magnitude larger than that obtained previously for similar porphyrin
molecules but wired from either end of the porphyrin ring. This work
presents a new concept of building highly efficient single-molecule
electrical contacts by exploiting metal coordination chemistry
Electronically and ionically conductive gels of ionic liquids and charge-transfer tetrathiafulvalene-tetracyanoquinodimethane
10.1021/la202465kLangmuir271710953-10961LANG