Evidence for direct tunneling and studies of the electron attenuation coefficient in porphyrin molecular junctions
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Authors
Esposito, Teresa A.
Issue Date
2017-12
Type
Electronic thesis
Thesis
Thesis
Language
ENG
Keywords
Physics
Alternative Title
Abstract
Three types of porphyrin molecules are studied: 5,15-di[4-(S-acetylthio) phenyl] 10, 20-diphenylporphine (FBP), Zn(II) 5,15-di [4-(S-acetylthio)phenyl] 10,20- di phenyl porphine (Zn-P), and Fe(III) 5,15-di[4-(S-acetylthio) phenyl] 10,20-diphenyl porphine acetate (Fe-P). For these experiments, MJs are formed using a zig-zag electromigration technique. Prior to electromigration, molecules are drop dried on intact 50 nm x 30 nm gold wires, and the voltage across the wire is increased until a 3-5 nm junction is formed (i.e. when a current density of about 10^12 A/m^2 is achieved). During this process, the molecules bridge the gap to form the molecular junction. Current/voltage (I/V), dI/dV, and IETS (d^2I/dV^2) are collected simultaneously over a range of temperatures.
Description
December 2017
School of Science
School of Science
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY