Research Article | OPEN ACCESS
Enhanced Stability in Surface Plasmon Resonance Sensor Using Prism Coupler Based on Au/Bi2O3 Bilayer Film
Chenghua Sui, Zhong Lu, Bo Yan and Gaoyao Wei
College of Science, Zhejiang University of Technology, Hangzhou 310023, China
Research Journal of Applied Sciences, Engineering and Technology 2013 23:5391-5395
Received: November 12, 2012 | Accepted: January 17, 2013 | Published: May 28, 2013
Abstract
Surface Plasmon Resonance (SPR) sensing has become a comprehensive utilized technology for detection, measurement and analysis in a wide spectrum of fields, ranging from biotechnology, environmental monitoring to food and drug monitoring. In this study, Au/Bi2O3 bilayer films with various layer thicknesses were deposited by thermal evaporation method on BK7 prism substrates and then post-annealing was conducted under ambient conditions. The adhesive strength of Au/Bi2O3 and Bi2O3/prism was measured with different layer thicknesses. Also, the SPR responses (reflectance vs. incident angle) were investigated as a function of the thickness of Bi2O3 layer in the Kretschmann geometry using ethanol as dielectric. The results indicate that the adhesive strength between Au and prism was improved more than 3 times by introducing the Bi2O3 as buffer layer. And the SPR dips also demonstrate that SPR sensor based on Au/Bi2O3 bilayer films is practical, although the height of SPR dip with about 6nm Bi2O3 is approximately 4 times weaker than that of monolayer Au and the width (defined as FWHM) broadens from 9° to 11°.
Keywords:
Adhesive strength, Au/Bi2O3 bilayer film, Kretschman geometry, SPR sensor,
Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright
The authors have no competing interests.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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