The electrical and structural features of vanadium-oxide films as formed by the thermal decomposition of vanadium naphthenate.

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概要

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• Vanadium-oxide thin film, which was amorphous, brownish, and transparent, was prepared more conveniently by improving Sekiya-Matsushita's method by, for instance, decomposing vanadium naphthenate thermally; that is, 10 wt% of a 1-butanol solution of vanadium naphthenate was dropped on slide glass, dried in air, decomposed at 600 °C for 20 min under 0.5 l/min of a N<SUB>2</SUB> stream which was equilibrated with water at 21.5 °C, and then taken out rapidly into the air for cooling. The VO thin film thus prepared usually showed an abrupt change in electric conductivity from 2×10<SUP>−5</SUP> to 1×10<SUP>−4</SUP> Ω<SUP>−1</SUP> at about 60 °C. The electrical feature was greatly affected by the addition of other metal oxides, such as Na<SUB>2</SUB>O, TiO<SUB>2</SUB>, Cr<SUB>2</SUB>O<SUB>3</SUB>, MoO<SUB>3</SUB>, and ZrO<SUB>2</SUB>. Both the conductivity and the gap tended to decrease in the cases of TiO<SUB>2</SUB>, Cr<SUB>2</SUB>O<SUB>3</SUB>, and MoO<SUB>3</SUB>, and to increase in ZrO<SUB>2</SUB>. On the addition of Na<SUB>2</SUB>O, however, the conductivity increased only at temperatures lower than the transition point; thus, the gap decreased greatly, almost disappearing. It was concluded from these facts that the electrical feature of the vanadium-oxide film must be controlled to a great extent by the addition of some compounds of vanadium oxide with the other metal oxides formed at the grain boundary of the VO<SUB>2</SUB> amorphous particles. That is, the larger the conductivity of the compound in the boundary layer, the more clearly the intrinsic feature of the VO<SUB>2</SUB> particles appears, and <I>vice versa</I>.

• 公益社団法人 日本化学会の論文

著者

• Kera Yoshiya

  Department Of Applied Chemistry Faculty Of Science And Engineering Kinki University

• Kida Shigeharu

  Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University

• Imori Hisateru

  Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University

• Degawa Katsumi

  Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University

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