Surface plasmon resonance biochip based on ZnO thin film for nitric oxide sensing

被引：0
作者：
Institute of Biomedical Engineering, National Taiwan University, Taipei 10617, Taiwan [1 ]
不详 [2 ]
不详 [3 ]
不详 [4 ]
机构：
[1] Institute of Biomedical Engineering, National Taiwan University
[2] Department of Electrical Engineering, National Taiwan University
[3] Industrial Technology Research Institute, Center for Measurement Standards
[4] Integrated Manufacturing Technologies Institute, National Research Council
来源：
J. Bionanoscience | 2008年 / 1卷 / 62-66期
关键词：
Gas sensor; Nitric oxide; Surface plasmon resonance; Zinc oxide; ZnO thin film;
D O I：
10.1166/jbns.2008.028
中图分类号：
学科分类号：
摘要：
In this study, the design of a novel optical sensor that comprises surface plasmon resonance sensing chip and zinc oxide nano-film was proposed for the detection of nitric oxide gas. The electrical and optical properties of zinc oxide film vary in the presence of nitric oxide. This effect was utilized to prepare biochemical sensors with transduction based on surface plasmon resonance. Due to the refractive index of the transparent zinc oxide film that was deposited on the gold film, however, changes will be observed in the surface plasmon resonance spectra. For this reason, the thickness of zinc oxide film will be investigated and determined in this study. The interaction of nitric oxide with a 20 nm zinc oxide layer on gold leads to the shift of the resonance angle. The analysis on the reflectance intensity of light demonstrates that such effect is caused by the variation of conductivity and permittivity of zinc oxide film. Finally, a shift in surface plasmon resonance angle was measured in 25 ppm nitric oxide at 180 °C and a calibration curve of nitride oxide concentration versus response intensity was successfully obtained in the range of 250 to 1000 ppm nitric oxide at lower temperature of 150 °C. Moreover, these effects are quasi-reversible. Copyright © 2008 American Scientific Publishers. All rights reserved.
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页码：62 / 66
页数：4
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