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Electron transport in single molecules: from benzene to graphene
1Center for Bioelectronics and Biosensors, the Biodesign Institute, Department of Electrical Engineering, Arizona State University, Tempe, Arizona 85287, USA.
Accounts of Chemical Research
|March 4, 2009
Summary
Single-molecule electron transport, studied using advanced microscopy, reveals how molecular properties influence electrical conductance. This research is key for developing molecular-scale electronic devices.
Area of Science:
- Physical Chemistry
- Molecular Electronics
- Nanotechnology
Background:
- Electron transfer is crucial in chemical, electrochemical, and biological systems.
- Single-molecule studies are advancing our understanding of electron movement.
- Scanning electrochemical microscopy (SECM), scanning-tunneling microscopy (STM), and atomic force microscopy (AFM) enable single-molecule investigations.
Purpose of the Study:
- To describe electron transport at the single-molecule level.
- To differentiate between electron transport and electron transfer.
- To explore the relationship between these phenomena for broader applications.
Main Methods:
- Examining electron transport through single molecules connected to electrodes.
- Analyzing the impact of molecular properties on conductance.
- Investigating polycyclic aromatic hydrocarbons (PAHs) as model systems.
Main Results:
- Molecular conductance is highly dependent on intrinsic properties and environment.
- Factors like molecular length, coupling, conjugation, and redox centers significantly affect conductance.
- Polycyclic aromatic hydrocarbons (PAHs) demonstrate a range of conductances based on their structure, from benzene to graphene.
Conclusions:
- Single-molecule electron transport is complex, influenced by molecular structure and environment.
- Understanding this transport is vital for fundamental science and molecular electronics.
- PAHs offer valuable insights into electron transport, bridging small molecule redox chemistry and nanostructure properties.
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