Electronics and Chemistry: Varying Single Molecule Junction Conductance Using Chemical Substituents
arXiv:cond-mat/0703446 · doi:10.1021/nl062923j
Abstract
We measure the low bias conductance of a series of substituted benzene diamine molecules while breaking a gold point contact in a solution of the molecules. Transport through these substituted benzenes is by means of nonresonant tunneling or superexchange, with the molecular junction conductance depending on the alignment of the metal Fermi level to the closest molecular level. Electron-donating substituents, which drive the occupied molecular orbitals up, increase the junction conductance, while electron-withdrawing substituents have the opposite effect. Thus for the measured series, conductance varies inversely with the calculated ionization potential of the molecules. These results reveal that the occupied states are closest to the gold Fermi energy, indicating that the tunneling transport through these molecules is analogous to hole tunneling through an insulating film.
14 pages, 4 figures
References in corpus (4)
Cited by in corpus (27)
- Amine-Gold Linked Single-Molecule Junctions: Experiment and Theory
- Amine-Linked Single Molecule Circuits: Systematic Trends Across Molecular Families
- Lithographic mechanical break junctions for single-molecule measurements in vacuum: possibilities and limitations
- Length-dependent conductance and thermopower in single-molecule junctions of dithiolated oligophenylene derivatives
- Influence of Functional Groups on Charge Transport in Molecular Junctions
- Relating Energy Level Alignment and Amine-Linked Single Molecule Junction Conductance
- Tilt-angle landscapes and temperature dependence of the conductance in biphenyl-dithiol single-molecule junctions
- Conduction mechanisms in biphenyl-dithiol single-molecule junctions
- Single-Molecule Junction Conductance through Diaminoacenes
- Modeling elastic and photoassisted transport in organic molecular wires: length dependence and current-voltage characteristics
- Theoretical study of the charge transport through C60-based single-molecule junctions
- Electronic and optical properties of electromigrated molecular junctions
- Tuning the thermal conductance of molecular junctions with interference effects
- Band Alignment in Molecular Devices: Influence of Anchoring Group and Metal Work Function
- Non-equilibrium electronic structure of interacting single-molecule nanojunctions: vertex corrections and polarization effects for the electron-vibron coupling
- Unsupervised Segmentation-Based Machine Learning as an Advanced Analysis Tool for Single Molecule Break Junction Data
- From Chemistry to Functionality: Trends for the Length Dependence of the Thermopower in Molecular Junctions
- IETS and quantum interference: propensity rules in the presence of an interference feature
- Conformation dependence of charge transfer and level alignment in nitrobenzene junctions with pyridyl anchor groups
- Synthesis and electrical properties of fullerene-based molecular junctions on silicon substrate
- Electron transfer through a single barrier inside a molecule: from strong to weak coupling
- Tuning spin filtering by anchoring groups in benzene derivative molecular junctions
- Variability of the thermal conductance of gold-alkane-gold single-molecule junctions studied using ab-initio and molecular dynamics approaches
- Molecular electronics based on self-assembled monolayers
- Charge order in an interacting monolayer under transverse bias
- Designing all-graphene nanojunctions by covalent functionalization
- Organic molecular thin films for nanoscale information memory applications