Side-by-side characterization of electron tunneling through monolayers of isomeric molecules: A combined experimental and theoretical study

Jian Liang, Qiang Sun, Annabella Selloni, Giacinto Scoles

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

We report a new experimental method for measuring relatively small differences in electron tunneling through two distinct monolayers. We place them side by side using scanning probe nanolithography and compare the tunneling currents by conductive probe atomic force microscopy under identical force, voltage, and tip contamination conditions. We demonstrate the validity of our approach by applying it to two isomeric molecules with similar length and functional groups, with only the position of two functional groups, one aromatic and the other aliphatic, being inverted with respect to each other. The relative values of the two tunneling currents, calculated using density functional theory and the Tersoff-Hamann approach, compare very well with the experimental data, providing us with an example of theory vs experiment agreement that is rather uncommon in this field.

Original languageEnglish (US)
Pages (from-to)24797-24801
Number of pages5
JournalJournal of Physical Chemistry B
Volume110
Issue number49
DOIs
StatePublished - Dec 14 2006

All Science Journal Classification (ASJC) codes

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

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