Preparation of Ultrathin Functional Organic Filsm using Liquid Jet Technique

1996 Fiscal Year Final Research Report Summary

• Project/Area Number: 07554035
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 試験
• Research Field: 機能・物性・材料
• Research Institution: Nagoya University
• Principal Investigator: SEKI Kazuhiko Nagoya University Chemistry Professor, 大学院・理学研究科, 教授 (80124220)
• Co-Investigator(Kenkyū-buntansha): ISHII Hisao Okazaki National Institutes Inst. Molecular Science Assistant Professor, 分子科学研究所, 助手 (60232237) ; OUCHI Yukio Nagoya University Chemistry Associate Professor, 大学院・理学研究科, 助教授 (60194081)
• Project Period (FY): 1995 – 1996
• Keywords: Functional Organic Materials / Ultrathin Films / Liquid Jet Technique / Clusters / J-Aggregates / Cyanine Dyes

Research Abstract

An apparatus for fabricating ultrathin films of functional organic materials was designed and constructed based on the liquid jet technique, where a fine beam solution is injected into vacuum, developed by the group of Professor N.Nishi of Kyushu University. The organic material is dissolved in the solution as the solvent. This technique has an advantage of applicability to various large organic molecules.
The apparatus consists of three vacuum chambers, low vacuum, medium vacuum, and high vacuum chmbers. At the low vacuum chamber, liquid jet is ejected through a fine stainless steel needle by a flow pump for liquid chromatography. The beam is split into many small particles when it is sprayd into vacuum, and the middle part of the beam is selected by a skimmer. In the medium vacuum chamber, the fine partcles are further broken by the internal pressure, forming many clusters. The cluster beam is again passed through a skimmer, and the selected part is allowed to fly in the high vaccum chamber to arrive at the substrate to form the thin film.
The apparatus is designed following the guidance of Prof. Nishi, and constructed at Nagoya University. The vacuum test was completed, and some preliminary data was taken using rhodamin B as the sample material. The effect of the temperature of the ejection nozzle, flow rate of the solution, and the solvent (water and ethanol) were examined. The prepared films were examined by polarized microscope, visible absorption spectra, and fluorescence spectra. Depending on the conditions, various films containing fine particles to small crystals were formed. The next step should be the formation of J-aggregates using cyanine dyes.