Photoconductive properties of organic-inorganic hybrid films of layered perovskite-type niobate

Kazuko Saruwatari, Hisako Sato, Tomochika Idei, Jun Kameda, Akihiko Yamagishi, Atsushi Takagaki, Kazunari Domen

研究成果: Contribution to journalArticle

41 引用 (Scopus)

抜粋

A hybrid film of layered niobate and an organic amphiphile was prepared by the Langmuir-Blodgett (LB) method. Trimethylammonium-exchanged perovskite-type niobates ((CH3NHSr2Nb3O10) were exfoliative to form an aqueous suspension. A monolayer of octadecylamine was produced on such an aqueous dispersion as a template for a hybrid film. A hybrid film was transferred as a Y-type LB film onto a hydrophilic glass plate or an ITO substrate. The structure of a deposited film was investigated with X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and atomic force microscopy (AFM) measurements, indicating a layer-by-layer structure with a single or double sheet of niobate as an inorganic composite. From the cyclic voltammogram on an ITO electrode modified with the Y-type 10 layered film, the lower edge of the conduction band of a niobate layer was determined to be - 0.6 V (vs Ag/AgCl). ac impedance and dc measurements were carried out on 1, 5, and 10-layered LB films (2 mm (electrode spacing) × 8 mm (width)) with aluminum electrodes. The freshly deposited samples behaved as an insulator under the illumination of 280 nm light (2.04 × 1016 quanta s-1). Photoconductivities appeared, however, when they were preirradiated with a 150 W Xe lamp (ca. 2 × 1018 quanta s -1) for 0.5-8.5 h. The process was denoted as photomodification. From the FT-IR and XRD results, it was deduced that the photomodification of LB films caused the decomposition of organic templates (octadecylammonium) accompanied by the collapse of layer-by-layer structures. dc analyses on the 5- and 10-layered films after photomodification also showed that they behaved as a photosemiconductor under UV light illumination.

元の言語英語
ページ(範囲)12410-12416
ページ数7
ジャーナルJournal of Physical Chemistry B
109
発行部数25
DOI
出版物ステータス出版済み - 6 30 2005
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

フィンガープリント Photoconductive properties of organic-inorganic hybrid films of layered perovskite-type niobate' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用