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Mechanically Induced Switching of Molecular Layers.

Jonathan Berson¹, Markus Moosmann¹, Stefan Walheim¹

¹Institute of Nanotechnology and Institute of Applied Physics , Karlsruhe Institute of Technology (KIT) , 76131 Karlsruhe , Germany.

|January 30, 2019

Summary

Researchers discovered that mechanical force can trigger azobenzene monolayers to switch, altering surface properties like wettability and friction. This mechanically induced switching is optically reversible and enables novel nanopatterning techniques.

Keywords:

Molecular switch azobenzene mechanical switching nanolithography self-assembled monolayers

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Area of Science:

Surface Science
Materials Chemistry
Nanotechnology

Background:

Azobenzene molecules are known for light-induced reversible conformational changes.
These molecules are utilized in molecular switches and motors.
Switching typically relies on light irradiation.

Purpose of the Study:

To investigate mechanically triggered switching of azobenzene monolayers.
To explore changes in surface properties due to mechanical stimuli.
To develop new nanopatterning methods using mechanical force.

Main Methods:

Utilized atomic force microscopy (AFM) for local mechanical triggering.
Employed particle impact for macroscopic mechanical triggering.
Investigated optical reversibility and collective switching behavior.

Main Results:

Demonstrated mechanically induced cis-trans isomerization in azobenzene monolayers.
Observed changes in surface wettability, adhesion, and friction upon mechanical stimulation.
Achieved collective, domino-like switching propagation and nondestructive nanopatterning.

Conclusions:

Mechanical force is a viable stimulus for switching azobenzene monolayers, complementing light-based methods.
Mechanically induced switching offers tunable control over surface properties.
Developed a novel, erasable nanopatterning technique called cis-trans nanolithography.