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Updated: May 25, 2026

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

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Channel selective tunnelling through a nanographene assembly.

H S Wong¹, X Feng, K Müllen

¹Nanoscience Centre, University of Cambridge, Cambridge, UK.

|February 11, 2012

Summary

Functionalizing a scanning tunnelling microscope tip with hexa-peri-hexabenzocoronene (HBC) molecules enabled selective charge transport imaging. This breakthrough allows visualization of distinct molecular orbital patterns in organic interfaces.

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Area of Science:

Nanoscience
Organic Electronics
Surface Science

Background:

Scanning tunnelling microscopy (STM) is crucial for nanoscale imaging.
Understanding charge transport in molecular assemblies is key for organic electronics.
Conventional STM tips have limitations in probing specific molecular energy levels.

Purpose of the Study:

To develop a method for selective charge transport imaging in molecular assemblies.
To investigate the electronic properties of hexa-peri-hexabenzocoronene (HBC) using STM.
To correlate observed charge density patterns with molecular orbital calculations.

Main Methods:

Functionalization of an STM tip with hexa-peri-hexabenzocoronene (HBC) molecules.
Utilizing STM to achieve selective tunnelling through an intermolecular tunnel junction.
Applying electric fields to tune tunnelling channels.
Performing density functional theory (DFT) calculations to analyze molecular orbitals.

Main Results:

Achieved selective tunnelling through an HBC-functionalized STM tip.
Observed distinct charge density patterns in the HBC assembly, not visible with bare tips.
Correlated imaged patterns with calculated π-orbital states and Clar aromatic sextet formula.
Demonstrated access to energy ranges below the Fermi level at room temperature.

Conclusions:

HBC-functionalized STM tips enable selective probing of molecular electronic states.
This technique provides insights into charge transport mechanisms in organic interfaces.
Potential for controlling charge transport in organic electronic devices.