Jun, 2005
Photoconductive properties of organic-inorganic hybrid films of layered perovskite-type niobate
JOURNAL OF PHYSICAL CHEMISTRY B
- ,
- ,
- ,
- ,
- ,
- ,
- Volume
- 109
- Number
- 25
- First page
- 12410
- Last page
- 12416
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1021/jp0505476
- Publisher
- AMER CHEMICAL SOC
A hybrid film of layered niobate and an organic amphiphile was prepared by the Langmuir-Blodgett (LB) method. Trimethylammonium-exchanged perovskite-type niobates ((CH3)(3)NHSr2Nb3O10) 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) x 8 mm (width)) with aluminum electrodes. The freshly deposited samples behaved as an insulator under the illumination of 280 nm light (2.04 x 10(16) quanta s(-1)). Photoconductivities appeared, however, when they were preirradiated with a 150 W Xe lamp (ca. 2 x 10(18) 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.
- Link information
-
- DOI
- https://doi.org/10.1021/jp0505476
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000230122900029&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=22744440198&origin=inward
- ID information
-
- DOI : 10.1021/jp0505476
- ISSN : 1520-6106
- SCOPUS ID : 22744440198
- Web of Science ID : WOS:000230122900029