Morphological Analysis of Self-assembled Structures of Merbromin Molecules Adsorbed on Titanium(IV) Oxide Nanoparticles

ADACHI Kenta, TSURU Nodoka

doi:10.2116/bunsekikagaku.67.719

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酸化チタンナノ粒子表面に吸着したメルブロミン色素分子の自己会合構造解析
サンカチタンナノリュウシヒョウメンニキュウチャクシタメルブロミンシキソブンシノジコカイゴウコウゾウカイセキ

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Abstract

<p>A broad understanding of the adsorption and aggregation behavior of organic dye molecules on an inorganic semiconductor surface provides a new strategy for optical and electronic devices. We chose merbromin (Merb) and titanium(IV) oxide (TiO₂) colloids in this study. The adsorption and aggregation behavior of Merb in a TiO₂ colloid aqueous solution were spectrophotometrically investigated. The absorption spectra of Merb were significantly red-shifted in the visible region upon the addition of a TiO₂ colloid solution. Detailed spectral analysis based on Kasha's exciton coupling theory and a modified Langmuir adsorption model revealed that dianionic Merb molecules are adsorbed flat on a positively charged TiO₂ colloid surface by an electrostatic interaction, and eventually form "oblique" J-type dimers aligned in a head-to-tail fashion. We envisage new applications of this analysis in the development of advanced dye-sensitized solar cells, where the adsorption/aggregation morphology of organic dyes on the metal oxide is a crucial factor to be considered.</p>

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 67 (12), 719-726, 2018-12-05

The Japan Society for Analytical Chemistry

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