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Pentacene nanorails on Au(110).

Gregor Bavdek¹, Albano Cossaro, Dean Cvetko

¹CNR-INFM Laboratorio Nazionale TASC, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 29, 2007

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We discovered a unique nanorail structure formed by pentacene molecules on gold, enabling stable organic self-assembly. This arrangement, with tilted molecules, facilitates pi-coupling for advanced molecular electronics.

Area of Science:

Surface Science
Materials Science
Organic Electronics

Background:

Understanding molecular orientation on surfaces is crucial for designing advanced electronic materials.
Pentacene is a key organic semiconductor with potential applications in thin-film transistors.

Purpose of the Study:

To investigate the molecular arrangement and orientation of pentacene monolayers on the Au(110) surface.
To characterize the stability and potential applications of observed pentacene phases.

Main Methods:

Near-edge X-ray absorption spectroscopy (NEXAFS) at the carbon K-shell.
Scanning tunneling microscopy (STM).

Main Results:

A high-coverage (6 x 8) phase of pentacene on Au(110) forms a nanorail structure.

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Two distinct molecular orientations were identified: flat-lying molecules forming chains and tilted molecules forming rails.

Tilted molecules exhibit weak hybridization with the substrate, resembling free molecules.

The nanorail structure is stable up to 420 K in vacuum and air-stable.

Conclusions:

The identified nanorail structure serves as a robust template for organic heterostructure self-assembly.
The tilted, quasi-free molecules offer excellent potential for lateral pi-coupling, crucial for charge transport in organic electronics.