Orientation in Methyl- and Hydroxyl-Terminated Self-Assembled Alkanephosphate Monolayers on Titanium Oxide Surfaces Investigated with Soft X-ray Absorption

M Zwahlen, S Tosatti, M Textor, Georg Hähner

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Titanium oxide surfaces were coated with methyl- and hydroxyl-terminated dodecyl phosphate monolayers by immersion of the substrates into aqueous solutions of the corresponding ammonium salts (DDPO4-(NH4)(2) and OH-DDPO4(NH4)(2)). The samples were examined by contact-angle measurements and near-edge X-ray absorption fine structure spectroscopy. DDPO4 was found to form self-assembled films of comparable quality to those of the longer octadecyl phosphate prepared from an organic solvent and to those of a similar thiol/gold system. The hydroxyl-terminated adsorbates, however, established films with a much lower degree of orientation under the same preparation conditions and showed ''high'' water contact angle values (50-55degrees) for a hydrophilic surface. Mixed films of both species establish a degree of orientation between those of both pure films, which is also reflected by their wettability.

Original languageEnglish
Pages (from-to)3957-3962
Number of pages6
JournalLangmuir
Volume18
Issue number10
DOIs
Publication statusPublished - 14 May 2002

Keywords

  • FINE-STRUCTURE SPECTROSCOPY
  • THIN-FILMS
  • ORGANIC FILMS
  • GOLD
  • ALKANETHIOLS
  • SILVER
  • ORDER
  • AU(111)
  • METALS
  • LAYERS

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