Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide

Dmitry A. Krapchetov, Hong Ma, Alex K.Y. Jen, Daniel A. Fischer, Yueh Lin Loo

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor.

Original languageEnglish (US)
Pages (from-to)5887-5893
Number of pages7
JournalLangmuir
Volume21
Issue number13
DOIs
StatePublished - Jun 21 2005

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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