Infrared spectroscopic characterization of [2]rotaxane molecular switch tunnel junction devices

Erica DeIonno, Hsian Rong Tseng, Desmond D. Harvey, J. Fraser Stoddart, James R. Heath*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

89 Scopus citations


Langmuir-Blodgett monolayers of a bistable [2]rotaxane were prepared at packing densities of 118, 73, and 54 Å2/molecule. The monolayers were both characterized via infrared spectroscopy before and after evaporation of a 2 nm film of titanium and incorporated into molecular switch tunnel junction devices. The study suggests that the evaporation process primarily affects portions of the molecule exposed to the metal atom source. Thus, in tightly packed monolayers (73 and 54 Å2/molecule), only the portions of the [2]rotaxane that are present at the molecule/air interface are clearly affected, leaving key functionality necessary for switching intact. Monolayers transferred at a lower pressure (118 Å2/molecule) exhibit nonspecific damage and poor switching behavior following Ti deposition. These results indicate that tightly packed monolayers and sacrificial functionality displayed at the molecule/air interface are important design principles for molecular electronic devices.

Original languageEnglish (US)
Pages (from-to)7609-7612
Number of pages4
JournalJournal of Physical Chemistry B
Issue number15
StatePublished - Apr 20 2006

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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