Jpn. J. Appl. Phys. 44 (2005) pp. 2081-2082  |Previous Article|  |Table of Contents|
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Brief Communication

Optical Band Gap of Barium Titanate Nanoparticles Prepared by RF-plasma Chemical Vapor Deposition

Keigo Suzuki and Kazunori Kijima1

Murata Manufacturing Co. Ltd., 1-10-1 Higashi-kotari, Nagaokakyo, Kyoto 617-8555, Japan
1Department of Chemistry and Materials Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto, Kyoto 606-8585, Japan

(Received November 11, 2004; accepted January 24, 2005; published April 8, 2005)

The size dependence of the band gap for barium titanate nanoparticles prepared by RF-plasma chemical vapor deposition was investigated by measuring the diffuse reflectance spectra. The band gap of the indirect transition gradually increased, as the particle sizes decreased to less than 11.5 nm. Consequently, the band gap for particles of 6.7 nm in size was measured to be 3.47 eV, which was approximately 0.25 eV larger than that of BaTiO3 bulk. This phenomenon was discussed on the basis of quantum confinement model.

DOI: 10.1143/JJAP.44.2081
KEYWORDS:rf-plasma, chemical vapor deposition, barium titanate, nanoparticles, band gap, diffuse reflectance

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