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

By S. A. Zynio, A. V. Samoylov, E. R. Surovtseva, V. Mirsky, Y. Shirshov. 2002

226 citations recorded by the source corpus.

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.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/bb18ff62a7edcb7669321fec1540409f11c45e04

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In Biomedical Engineering

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Citations in the corpus

Sensitivity evaluation of a multi-layered surface plasmon resonance-based fiber optic sensor: a theoretical study (2005, unknown): “[10] suggested a new structure of resonant metal films based onbimetallic layers (gold as outer one).”
Surface Plasmon Resonance-Based Fiber Optic Sensors: Principle, Probe Designs, and Some Applications (2009, methodology): “The SNR of the SPR sensor with angular interrogation is, thus, defined as [25]”
Photonic crystal fiber based plasmonic sensors (2017, background): “The oxidation process can be inhibited by depositing a thin bimetallic layer on top of the silver surface but it would reduce the sensing performance [95, 96].”
Fiber-Optic Sensors Based on Surface Plasmon Resonance: A Comprehensive Review (2007, methodology): “The SNR of the SPR sensor with angular interrogation is, thus, defined as [11]”
Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles (2009, methodology): “Bimetallic combinations have also been used in affinity sensors [21], fiber optic sensor devices [103], waveguides [104, 105], and light traps [106].”