Mechanical properties of oligothiophene self assembled films by atomic force microscopy

Imma Ratera*, Jinyu Chen, Amanda Murphy, Frank Ogletree, Jean M.J. Fréchet, Miquel B. Salmeron

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The oligothiophene derivative (4-(5''''-tetradecyl-[2,2';5',2'';5'', 2''';5''',2''''] pentathiophen-5-yl)-butyric acid (C14-5TBA) was synthesized and the structural and mechanical properties of self-assembled monolayers on mica have been studied by atomic force microscopy (AFM). The films were prepared by drop casting a dilute THF solution (1mM) of the oligothiphene on mica. Islands containing primarily monolayers with a very small percentage of multilayers were formed. The molecules adsorb through the carboxylic group, and expose the alkyl chain (CH2)13CH3. High resolution AFM scans reveal a well ordered structure of molecules with unit cell dimensions of 0.65 and 0.46 nm. Applying load to the tip, the molecular film was gradually compressed from an initial height of 4.1nm to a final one of 2.6 nm, corresponding to atilt of the alkyl chains. In regions covered with bilayers the molecules in the second layer were oriented opposite to those in the first layer, thus exposing the carboxylic end group to the air. These second layer was easily removed as the tip pressure increased.

Original languageEnglish (US)
Title of host publicationOrganic Thin-Film Electronics
PublisherMaterials Research Society
Number of pages6
ISBN (Print)155899825X, 9781558998254
StatePublished - 2005
Externally publishedYes
Event2005 MRS Spring Meeting - San Francisco, CA, United States
Duration: Mar 28 2005Apr 1 2005

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2005 MRS Spring Meeting
Country/TerritoryUnited States
CitySan Francisco, CA

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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