Journal
NANO LETTERS
Volume 19, Issue 2, Pages 816-822Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03987
Keywords
Molecular switch; mechanical switching; azobenzene; self-assembled monolayers; nanolithography
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Funding
- Baden-Wuerttemberg Stiftung gGmbH, Stuttgart
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Within the field of switchable surfaces, azobenzenes are an extensively studied group of molecules, known for reversibly changing conformation upon illumination with light of different wavelengths. Relying on the ability of the molecules to change properties and structure as a response to external stimuli, they have been incorporated in various devices, such as molecular switches and motors. In contrast to the well-documented switching by light irradiation, we report the discovery of mechanically triggered switching of self-assembled azobenzene monolayers, resulting in changes of surface wettability, adhesion, and friction. This mechanically induced cis-trans isomerization is triggered either locally and selectively by AFM or macroscopically by particle impact. The process is optically reversible, enabling consecutive switching cycles. Collective switching behavior was also observed, propagating from the original point of impact in a domino-like manner. Finally, local force application facilitated nondestructive and erasable nanopatterning, the cis-trans nanolithography.
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