IR and AFM studies on aging effects of one-layer langmuir-blodgett films of 2-alkyl-7,7,8,8-tetracyanoquinodimethane

Shinichi Morita, Haishui Wang, Yan Wang, Keiji Iriyama, Yukihiro Ozaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Aging Effects of one-layer Langmuir-Blodgett (LB) films of 2-alkyl-7,7,8,8-tetracyanoquinodimethane (alkyl-TCNQ) have been investigated by means of infrared (IR) and atomic force microscopy (AFM). Time-dependent infrared (IR) reflection-absorption (RA) spectral changes of a one-layer LB film of pentadecyl-TCNQ on a gold-evaporated glass slide indicate that the alkyl chain becomes more tilted with respect to the surface normal while the TCNQ plane becomes more perpendicular with time. Similar time-dependent changes in the molecular orientation were observed also for a one-layer LB film of pentadecyl-TCNQ on a CaF2 plate and for one-layer LB films of dodecyl-TCNQ on the gold-evaporated glass slide and CaF2 plate. However, one-layer LB films of octadecyl-TCNQ did not show a significant change in the molecular orientation. Time-dependent changes in the AFM image of a one-layer LB film of pentadecyl-TCNQ on mica show that the thickness of the LB film varies from 4.6 to 8.2 nm during the time course from 15 to 180 minutes after film deposition.

Original languageEnglish
Pages (from-to)215-220
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume322
DOIs
Publication statusPublished - 1998 Jan 1
Externally publishedYes

Keywords

  • Atomic force mycroscopy
  • Infrared spectroscopy
  • Langmuir-blodgett films
  • Molecular orientation
  • Tetracyanoquinodimethane

ASJC Scopus subject areas

  • Condensed Matter Physics

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