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Sensors 2002, 2(2), 62-70; doi:10.3390/s20200062
Article

Bimetallic Layers Increase Sensitivity of Affinity Sensors Based on Surface Plasmon Resonance

1, 1, 1, 2,* and 1
1 Institute of Semiconductor Physics, NASU, Prospect Nauki 45, 252650, Kiev-28, Ukraine 2 University of Regensburg, Institute of Analytical Chemistry, Chemo- and Biosensors, 93040 Regensburg, Germany
* Author to whom correspondence should be addressed.
Received: 9 January 2001 / Accepted: 15 February 2002 / Published: 23 February 2002
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Abstract

Two metals are used in resonant layers for chemical sensors based on surface plasmon resonance (SPR) - gold and silver. Gold displays higher shift of the resonance angle to changes of ambient refraction index and is chemically stable. Silver posses narrower resonance curve thus providing a higher signal/noise ratio of SPR chemical sensors, but has a poor chemical stability. A new structure of resonant metallic film based on bimetallic silver/gold layers (gold as an outer layer) is suggested. It combines advantages of both gold and silver resonant layers. Bimetallic resonant films display so high shift of resonance angle on changes of ambient refraction index as gold films, but show narrower resonance curve, thus providing a higher signal / noise ratio. Additionally, the outer gold layer protects silver against oxidation.
Keywords: Surface plasmon resonance; Biosensor; Sensitivity; Signal / noise ratio Surface plasmon resonance; Biosensor; Sensitivity; Signal / noise ratio
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Zynio, S.A.; Samoylov, A.V.; Surovtseva, E.R.; Mirsky, V.M.; Shirshov, Y.M. Bimetallic Layers Increase Sensitivity of Affinity Sensors Based on Surface Plasmon Resonance. Sensors 2002, 2, 62-70.

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