On the Langmuir-Blodgett transfer of copper tetra-tert-butyl phthalocyanine monolayers in the presence of arachidic acid

Ching Wen Sheu, Kuen Mo Lin, I. Hsun Ku, Chien Hsiang Chang, Yuh Lang Lee, Yu Min Yang, Jer Ru Maa

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11 Citations (Scopus)

Abstract

This study investigated the influence of arachidic acid as a transfer promoter on the deposition of multilayer copper tetra-tert-butyl phthalocyanine (CuTTBPc) Langmuir-Blodgett (L-B) films on both hydrophilic glass and hydrophobic silanized-glass substrates. With the addition of arachidic acid in a CuTTBPc monolayer at the air/water interface, two transitions corresponding to monolayer collapse were observed in the surface pressure-area isotherm. However, the added arachidic acid had no effect on area relaxation of a CuTTBPc monolayer at 20 mN m-1. The up-stroke L-B transfer of a CuTTBPc monolayer at 20 mN m-1 onto a glass substrate was perfect with a transfer ratio of 1.0, but most of the deposited film respread onto the interface during the following down-stroke deposition. It appears that the addition of arachidic acid with a molar fraction of 0.5 caused insignificant influence on the continuous L-B deposition of CuTTBPc films on glass substrates. On a silanized-glass substrate, imperfect Y-type multilayer CuTTBPc L-B films could be fabricated with transfer ratios around 0.5. The presence of arachidic acid in a CuTTBPc monolayer may considerably improve the down-stroke first layer deposition with a transfer ratio close to one. Moreover, the following up-stroke deposition quality of the L-B films was strongly affected by the molar fraction of arachidic acid.

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume207
Issue number1-3
DOIs
Publication statusPublished - 2002 Jul 30

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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