Electric conductivity of dye modified DNA films with and without light irradiation in various humidities

被引：17

作者：

Gu, JH ^{[1
]}

Cai, LT ^{[1
]}

Tanaka, S ^{[1
]}

Otsuka, Y ^{[1
]}

Tabata, H ^{[1
]}

Kawai, T ^{[1
]}

机构：

[1] Osaka Univ, Inst Sci & Ind Res, Osaka 5640047, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2002年 / 92卷 / 05期

关键词：

D O I：

10.1063/1.1498959

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Dye-DNA complex film was prepared by modifying DNA with acridine orange (AO) and depositing it on gold electrodes having a gap in the order of micrometers. Measurement of the electrical characteristics of the dye-DNA film was performed in a vacuum and in various humidities. A photoinduced conductivity change, which we suggest is caused by band or hopping conduction, was observed at relatively low humidity (20%) and in a vacuum. As the humidity rises to 70% and above, the current jumps from picoampere to milliampere levels. This dramatic resistance change corresponds to a dominant conductor mechanism change from hopping or band conductivity to ion conductivity. These reproducible characteristics of photoinduced and humidity-dependent conductivity suggest that the AO-DNA setup could be used as a photosensitive semiconducting device and as a humidity sensor chip. (C) 2002 American Institute of Physics.

引用

页码：2816 / 2820

页数：5

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