Direct monitoring of opto-mechanical switching of self-assembled monolayer films containing the azobenzene group

Einat Tirosh, Enrico Benassi, Silvio Pipolo, Marcel Mayor, Michal Valásek, Veronica Frydman, Stefano Corni, Sidney R. Cohen

Результат исследований: Материалы для журналаСтатья

15 Цитирования (Scopus)

Аннотация

The potential for manipulation and control inherent in molecule-based motors holds great scientific and technological promise. Molecules containing the azobenzene group have been heavily studied in this context. While the effects of the cis-trans isomerization of the azo group in such molecules have been examined macroscopically by a number of techniques, modulations of the elastic modulus upon isomerization in self-assembled films were not yet measured directly. Here, we examine the mechanical response upon optical switching of bis[(1,1'-biphenyl)-4-yl]diazene organized in a self-assembled film on Au islands, using atomic force microscopy. Analysis of higher harmonics by means of a torsional harmonic cantilever allowed real-time extraction of mechanical data. Quantitative analysis of elastic modulus maps obtained simultaneously with topographic images show that the modulus of the cis-form is approximately twice that of the trans-isomer. Quantum mechanical and molecular dynamics studies show good agreement with this experimental result, and indicate that the stiffer response in the cis-form comprises contributions both from the individual molecular bonds and from intermolecular interactions in the film. These results demonstrate the power and insights gained from cutting-edge AFM technologies, and advanced computational methods.

Язык оригиналаАнглийский
Страницы (с-по)834-844
Число страниц11
ЖурналBeilstein Journal of Nanotechnology
Том2
Номер выпуска1
DOI
СостояниеОпубликовано - 1 дек 2011
Опубликовано для внешнего пользованияДа

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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