Surface State Studies of Nanocrystalline TiO2 with High Dielectric Constant

Abstract

Abstract: An appropriate amount of stearic acid was melted at 70 ℃, into which tetrabutyl titanate was added while stirring. Then the solution was cooled in cool water to form a gel. By controlling the amount of oxygen during the calcining procedure, nanocrystalline TiO₂ powder with even grain size and good dielectric properties were obtained. The surface state was analyzed by means of X-ray photoelectron spectroscopy and surface photovoltage spectroscopy. The results of experiments show that the surface structure of nanocrystalline TiO₂ is not integrate mainly due to the existence of oxygen cavities and most of the exposing atoms on the grain surface are Ti⁴⁺. The surface states of nanocrystalline materials put important influence on their dielectric properties and make the static state dielectric constant much bigger than that of bulk material.

Key words: TiO₂, Nanocrystalline, Surface state, Dielectric property

CLC Number:

O64.11

TrendMD:

RUAN Sheng-Ping, DONG Wei, WU Feng-Qing, WANG Jing, ZHANG Xin-Dong, ZHAO Mu-Yu . Surface State Studies of Nanocrystalline TiO₂ with High Dielectric Constant[J]. Chem. J. Chinese Universities, 2004, 25(3): 484.

References

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Surface State Studies of Nanocrystalline TiO₂ with High Dielectric Constant

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